[{"data":1,"prerenderedAt":6437},["ShallowReactive",2],{"article-post-ja-video-bitrate-basics":3,"articles-all-ja":470},{"_path":4,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":8,"description":9,"slug":10,"date":11,"category":12,"tags":13,"body":17,"_type":464,"_id":465,"_source":466,"_file":467,"_stem":468,"_extension":469},"/articles/ja/video-bitrate-basics","ja",false,"","動画のビットレートを正しく理解する — 数字だけでは決まらない画質の話","「とりあえず高ビットレートで書き出せばきれい」は半分しか合っていません。VBR と CBR、コーデックとの組み合わせ、用途別の現実的な設定値まで、ビットレートにまつわる勘所をまとめます。","video-bitrate-basics","2026-05-15","article",[14,15,16],"fundamentals","bitrate","encoding",{"type":18,"children":19,"toc":454},"root",[20,28,41,48,60,75,80,86,98,103,128,140,146,151,254,259,264,269,322,334,339,351,390,402,408,420,425,430,442],{"type":21,"tag":22,"props":23,"children":24},"element","p",{},[25],{"type":26,"value":27},"text","書き出し画面の「ビットレート」を、いつも何となく設定していませんか。プリセットのまま、あるいは「念のため大きめ」で書き出してきた、という方も多いはずです。",{"type":21,"tag":22,"props":29,"children":30},{},[31,33,39],{"type":26,"value":32},"この記事では、ビットレートが",{"type":21,"tag":34,"props":35,"children":36},"strong",{},[37],{"type":26,"value":38},"実際に何を決めているのか",{"type":26,"value":40},"、どこで盛れば効くのか、どこで盛っても無駄なのかを整理します。",{"type":21,"tag":42,"props":43,"children":45},"h2",{"id":44},"ビットレートとは1-秒あたりに使えるデータ量",[46],{"type":26,"value":47},"ビットレートとは「1 秒あたりに使えるデータ量」",{"type":21,"tag":22,"props":49,"children":50},{},[51,53,58],{"type":26,"value":52},"ビットレートは単純に、",{"type":21,"tag":34,"props":54,"children":55},{},[56],{"type":26,"value":57},"1 秒の動画にどれだけのデータを割り当てるか",{"type":26,"value":59},"を表す数字です。単位は Mbps（メガビット毎秒）。",{"type":21,"tag":61,"props":62,"children":63},"ul",{},[64,70],{"type":21,"tag":65,"props":66,"children":67},"li",{},[68],{"type":26,"value":69},"50 Mbps の 4K 動画 = 1 秒で 50 メガビット ≒ 6.25 メガバイト",{"type":21,"tag":65,"props":71,"children":72},{},[73],{"type":26,"value":74},"10 分の動画なら 50 × 60 × 10 / 8 ≒ 3.75 GB",{"type":21,"tag":22,"props":76,"children":77},{},[78],{"type":26,"value":79},"ここまではただの計算です。ビットレートが面白くなるのは、「同じ Mbps でも見え方が違う」というところからです。",{"type":21,"tag":42,"props":81,"children":83},{"id":82},"なぜ高ビットレート-高画質とは限らないのか",[84],{"type":26,"value":85},"なぜ高ビットレート = 高画質、とは限らないのか",{"type":21,"tag":22,"props":87,"children":88},{},[89,91,96],{"type":26,"value":90},"ビットレートはあくまで",{"type":21,"tag":34,"props":92,"children":93},{},[94],{"type":26,"value":95},"容量の上限",{"type":26,"value":97},"であって、画質そのものではありません。実際の見え方を決めるのは、ビットレートと「コーデックの効率」「映像の複雑さ」の組み合わせです。",{"type":21,"tag":22,"props":99,"children":100},{},[101],{"type":26,"value":102},"たとえば：",{"type":21,"tag":61,"props":104,"children":105},{},[106,123],{"type":21,"tag":65,"props":107,"children":108},{},[109,114,116,121],{"type":21,"tag":34,"props":110,"children":111},{},[112],{"type":26,"value":113},"H.264 で 50 Mbps",{"type":26,"value":115}," と ",{"type":21,"tag":34,"props":117,"children":118},{},[119],{"type":26,"value":120},"H.265 (HEVC) で 25 Mbps",{"type":26,"value":122}," は、おおむね同等の画質になります。新しいコーデックほど、同じ画質を半分のビットレートで達成できる方向に進化しています。",{"type":21,"tag":65,"props":124,"children":125},{},[126],{"type":26,"value":127},"静かなインタビューと、激しいスポーツ映像。同じ 30 Mbps でも、後者のほうがブロックノイズが出やすい。動きが多いほどビットレートは「足りなく」なります。",{"type":21,"tag":22,"props":129,"children":130},{},[131,133,138],{"type":26,"value":132},"つまり、ビットレートを 2 倍にすれば画質が 2 倍になるわけではなく、ある点を超えるとほぼ何も変わらなくなります。",{"type":21,"tag":34,"props":134,"children":135},{},[136],{"type":26,"value":137},"コーデック × 解像度 × 動きの量",{"type":26,"value":139},"に対して「足りているか」が本質で、青天井に上げる意味は薄いのです。",{"type":21,"tag":42,"props":141,"children":143},{"id":142},"cbr-と-vbr-の使い分け",[144],{"type":26,"value":145},"CBR と VBR の使い分け",{"type":21,"tag":22,"props":147,"children":148},{},[149],{"type":26,"value":150},"ビットレートの「配り方」にも 2 つの考え方があります。",{"type":21,"tag":152,"props":153,"children":154},"table",{},[155,177],{"type":21,"tag":156,"props":157,"children":158},"thead",{},[159],{"type":21,"tag":160,"props":161,"children":162},"tr",{},[163,167,172],{"type":21,"tag":164,"props":165,"children":166},"th",{},[],{"type":21,"tag":164,"props":168,"children":169},{},[170],{"type":26,"value":171},"CBR（固定ビットレート）",{"type":21,"tag":164,"props":173,"children":174},{},[175],{"type":26,"value":176},"VBR（可変ビットレート）",{"type":21,"tag":178,"props":179,"children":180},"tbody",{},[181,200,218,236],{"type":21,"tag":160,"props":182,"children":183},{},[184,190,195],{"type":21,"tag":185,"props":186,"children":187},"td",{},[188],{"type":26,"value":189},"配り方",{"type":21,"tag":185,"props":191,"children":192},{},[193],{"type":26,"value":194},"全シーン一定",{"type":21,"tag":185,"props":196,"children":197},{},[198],{"type":26,"value":199},"難しいシーンに多く、簡単なシーンに少なく",{"type":21,"tag":160,"props":201,"children":202},{},[203,208,213],{"type":21,"tag":185,"props":204,"children":205},{},[206],{"type":26,"value":207},"画質効率",{"type":21,"tag":185,"props":209,"children":210},{},[211],{"type":26,"value":212},"普通",{"type":21,"tag":185,"props":214,"children":215},{},[216],{"type":26,"value":217},"良い",{"type":21,"tag":160,"props":219,"children":220},{},[221,226,231],{"type":21,"tag":185,"props":222,"children":223},{},[224],{"type":26,"value":225},"ファイルサイズの予測",{"type":21,"tag":185,"props":227,"children":228},{},[229],{"type":26,"value":230},"しやすい",{"type":21,"tag":185,"props":232,"children":233},{},[234],{"type":26,"value":235},"平均値から少しブレる",{"type":21,"tag":160,"props":237,"children":238},{},[239,244,249],{"type":21,"tag":185,"props":240,"children":241},{},[242],{"type":26,"value":243},"主な用途",{"type":21,"tag":185,"props":245,"children":246},{},[247],{"type":26,"value":248},"配信・固定帯域",{"type":21,"tag":185,"props":250,"children":251},{},[252],{"type":26,"value":253},"書き出し・アーカイブ",{"type":21,"tag":22,"props":255,"children":256},{},[257],{"type":26,"value":258},"ライブ配信のように「帯域が決まっている」用途は CBR、編集や納品の書き出しは VBR が定石です。VBR には「1-Pass」と「2-Pass」があり、2-Pass のほうが効率はよいが時間はおよそ倍かかります。最終納品なら 2-Pass、レビュー用なら 1-Pass で十分、というくらいの感覚で問題ありません。",{"type":21,"tag":42,"props":260,"children":262},{"id":261},"用途別の現実的な目安",[263],{"type":26,"value":261},{"type":21,"tag":22,"props":265,"children":266},{},[267],{"type":26,"value":268},"明確な「正解」はありませんが、現場で使われる目安はあります。以下はコーデックに H.264 を想定した値です。H.265 ならおおむね半分でも同等です。",{"type":21,"tag":61,"props":270,"children":271},{},[272,282,292,302,312],{"type":21,"tag":65,"props":273,"children":274},{},[275,280],{"type":21,"tag":34,"props":276,"children":277},{},[278],{"type":26,"value":279},"YouTube 1080p 30fps",{"type":26,"value":281}," — 8〜12 Mbps",{"type":21,"tag":65,"props":283,"children":284},{},[285,290],{"type":21,"tag":34,"props":286,"children":287},{},[288],{"type":26,"value":289},"YouTube 4K 30fps",{"type":26,"value":291}," — 35〜50 Mbps",{"type":21,"tag":65,"props":293,"children":294},{},[295,300],{"type":21,"tag":34,"props":296,"children":297},{},[298],{"type":26,"value":299},"マスター用 1080p（ProRes 422 など）",{"type":26,"value":301}," — 100 Mbps 以上",{"type":21,"tag":65,"props":303,"children":304},{},[305,310],{"type":21,"tag":34,"props":306,"children":307},{},[308],{"type":26,"value":309},"マスター用 4K（ProRes 422 / DNxHR HQ）",{"type":26,"value":311}," — 400〜500 Mbps",{"type":21,"tag":65,"props":313,"children":314},{},[315,320],{"type":21,"tag":34,"props":316,"children":317},{},[318],{"type":26,"value":319},"プロキシ編集用",{"type":26,"value":321}," — 5〜10 Mbps",{"type":21,"tag":22,"props":323,"children":324},{},[325,327,332],{"type":26,"value":326},"「マスター用」と「配信用」が桁違いに見えるのは、編集途中で色やクロップを加えた後でも画質が崩れない",{"type":21,"tag":34,"props":328,"children":329},{},[330],{"type":26,"value":331},"余白",{"type":26,"value":333},"を残しておくためです。一度 H.264 8 Mbps で書き出した素材から、再度高画質の納品物を作ることはできません。",{"type":21,"tag":42,"props":335,"children":337},{"id":336},"アーカイブで意識したいこと",[338],{"type":26,"value":336},{"type":21,"tag":22,"props":340,"children":341},{},[342,344,349],{"type":26,"value":343},"長期保存を考えるなら、ビットレートよりも先に「",{"type":21,"tag":34,"props":345,"children":346},{},[347],{"type":26,"value":348},"どのコーデックで残すか",{"type":26,"value":350},"」を決めるべきです。",{"type":21,"tag":61,"props":352,"children":353},{},[354,366,378],{"type":21,"tag":65,"props":355,"children":356},{},[357,359,364],{"type":26,"value":358},"H.264 / H.265 のような",{"type":21,"tag":34,"props":360,"children":361},{},[362],{"type":26,"value":363},"配信向きコーデック",{"type":26,"value":365},"は、保管としては優秀ですが、編集での扱いは重い",{"type":21,"tag":65,"props":367,"children":368},{},[369,371,376],{"type":26,"value":370},"ProRes / DNxHR のような",{"type":21,"tag":34,"props":372,"children":373},{},[374],{"type":26,"value":375},"編集向きコーデック",{"type":26,"value":377},"は、ファイルは大きいが切り張りに強い",{"type":21,"tag":65,"props":379,"children":380},{},[381,383,388],{"type":26,"value":382},"撮って出しの",{"type":21,"tag":34,"props":384,"children":385},{},[386],{"type":26,"value":387},"カメラ内記録",{"type":26,"value":389},"（XAVC、H.265 など）は、そのまま保管するのが現実的な落としどころ",{"type":21,"tag":22,"props":391,"children":392},{},[393,395,400],{"type":26,"value":394},"VideoTagger のように「アーカイブから素材を探し直す」ことを前提にしているなら、",{"type":21,"tag":34,"props":396,"children":397},{},[398],{"type":26,"value":399},"カメラ内記録のまま残し、必要なときだけ編集向けコーデックへ変換する",{"type":26,"value":401},"フローが、容量と将来の再利用の両方でバランスが取れます。",{"type":21,"tag":42,"props":403,"children":405},{"id":404},"videotagger-では数値が自動で見える",[406],{"type":26,"value":407},"VideoTagger では数値が自動で見える",{"type":21,"tag":22,"props":409,"children":410},{},[411,413,418],{"type":26,"value":412},"VideoTagger はライブラリに取り込んだ動画を解析して、",{"type":21,"tag":34,"props":414,"children":415},{},[416],{"type":26,"value":417},"ビットレート（全体・映像トラック）・コーデック・解像度・フレームレート",{"type":26,"value":419},"などを自動的に抽出し、「ファイル情報」パネルに表示します。1 本ずつメディアプレイヤーで開いて中身を確認する必要はありません。",{"type":21,"tag":22,"props":421,"children":422},{},[423],{"type":26,"value":424},"コーデック・解像度・フレームレート・長さ・ファイルサイズでの絞り込みにも対応しているので、「マスター品質の素材だけを抜き出す」「特定の納品スペックに合うクリップを集める」といった用途で、ライブラリ全体を一度に横断できます。",{"type":21,"tag":42,"props":426,"children":428},{"id":427},"まとめ",[429],{"type":26,"value":427},{"type":21,"tag":22,"props":431,"children":432},{},[433,435,440],{"type":26,"value":434},"ビットレートの数字は、それだけでは画質を意味しません。",{"type":21,"tag":34,"props":436,"children":437},{},[438],{"type":26,"value":439},"コーデック・解像度・動きの量・用途",{"type":26,"value":441},"の 4 つを並べて初めて、「足りている／盛りすぎ」が判断できます。",{"type":21,"tag":22,"props":443,"children":444},{},[445,447,452],{"type":26,"value":446},"迷ったときは、まず",{"type":21,"tag":34,"props":448,"children":449},{},[450],{"type":26,"value":451},"用途を先に決める",{"type":26,"value":453},"ことです。配信なのか、マスターなのか、プロキシなのか。ビットレートの設定はそのあと自然に決まります。",{"title":7,"searchDepth":455,"depth":455,"links":456},2,[457,458,459,460,461,462,463],{"id":44,"depth":455,"text":47},{"id":82,"depth":455,"text":85},{"id":142,"depth":455,"text":145},{"id":261,"depth":455,"text":261},{"id":336,"depth":455,"text":336},{"id":404,"depth":455,"text":407},{"id":427,"depth":455,"text":427},"markdown","content:articles:ja:video-bitrate-basics.md","content","articles/ja/video-bitrate-basics.md","articles/ja/video-bitrate-basics","md",[471,1578,2309,3098,3719,4431,4896,5242,5666,5993],{"_path":472,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":473,"description":474,"slug":475,"date":476,"category":12,"tags":477,"body":481,"_type":464,"_id":1575,"_source":466,"_file":1576,"_stem":1577,"_extension":469},"/articles/ja/frame-rate-basics","フレームレート入門 — 24fps はなぜ「映画らしい」のか、29.97 はなぜ中途半端な数字なのか","カメラのメニューを開くと 24 / 25 / 29.97 / 30 / 50 / 59.94 / 60 / 120 / 240fps と並んでいて、どれを選べばいいかわからない。フレームレートには歴史と用途と「動きの見え方」が詰まっています。数字の意味と選び方を一度に整理します。","frame-rate-basics","2026-05-20",[14,478,479,480],"frame-rate","motion","broadcast",{"type":18,"children":482,"toc":1558},[483,495,507,512,526,539,551,556,562,579,591,616,628,634,644,662,667,673,678,688,708,720,767,794,800,824,842,847,861,873,893,905,939,950,956,961,1004,1023,1028,1038,1044,1049,1072,1093,1098,1104,1116,1139,1151,1192,1204,1210,1215,1330,1342,1347,1359,1382,1393,1398,1425,1443,1456,1462,1474,1492,1504,1508,1546],{"type":21,"tag":22,"props":484,"children":485},{},[486,488,493],{"type":26,"value":487},"カメラの撮影設定を開くと、フレームレートの欄には ",{"type":21,"tag":34,"props":489,"children":490},{},[491],{"type":26,"value":492},"24 / 25 / 29.97 / 30 / 50 / 59.94 / 60 / 120 / 240",{"type":26,"value":494}," といった数字が並んでいます。なぜこんなに種類があるのか、どれを基準にすればいいのか──意外と説明しきれる人は少ないはずです。",{"type":21,"tag":22,"props":496,"children":497},{},[498,500,505],{"type":26,"value":499},"それぞれの数字には、フィルム時代の機械的な事情、テレビ放送の歴史、人間の目の特性、そして「動きをどう見せたいか」という意図が詰まっています。この記事では、よく使われるフレームレートの",{"type":21,"tag":34,"props":501,"children":502},{},[503],{"type":26,"value":504},"由来と使い分け",{"type":26,"value":506},"を、現場で迷わないレベルまで整理します。",{"type":21,"tag":42,"props":508,"children":510},{"id":509},"そもそもフレームレートとは",[511],{"type":26,"value":509},{"type":21,"tag":22,"props":513,"children":514},{},[515,517,524],{"type":26,"value":516},"フレームレートは「1 秒あたりに何枚の静止画を見せるか」を表す数値です。単位は ",{"type":21,"tag":518,"props":519,"children":521},"code",{"className":520},[],[522],{"type":26,"value":523},"fps",{"type":26,"value":525},"（frames per second）。",{"type":21,"tag":61,"props":527,"children":528},{},[529,534],{"type":21,"tag":65,"props":530,"children":531},{},[532],{"type":26,"value":533},"24fps なら 1 秒に 24 枚",{"type":21,"tag":65,"props":535,"children":536},{},[537],{"type":26,"value":538},"60fps なら 1 秒に 60 枚",{"type":21,"tag":22,"props":540,"children":541},{},[542,544,549],{"type":26,"value":543},"枚数が多いほど動きはなめらかになり、少ないほどカクついて見えます。ただし「多ければ良い」というほど単純な話ではなく、",{"type":21,"tag":34,"props":545,"children":546},{},[547],{"type":26,"value":548},"どの数字を選ぶかが、映像のトーンそのものを決めます",{"type":26,"value":550},"。",{"type":21,"tag":22,"props":552,"children":553},{},[554],{"type":26,"value":555},"人間の目は約 10〜12fps を超えるあたりから個別の画像ではなく「動き」として知覚し始めます（仮現運動）。これ以上は連続した動きに見えるという閾値であって、表現としての違いはここから先に出てきます。",{"type":21,"tag":42,"props":557,"children":559},{"id":558},"_24fps-映画の標準",[560],{"type":26,"value":561},"24fps — 映画の標準",{"type":21,"tag":22,"props":563,"children":564},{},[565,570,572,577],{"type":21,"tag":34,"props":566,"children":567},{},[568],{"type":26,"value":569},"24fps は映画の標準フレームレートです",{"type":26,"value":571},"。サイレント映画時代は 16〜18fps 程度でしたが、1920 年代後半にトーキー（音声付き映画）が普及した際、音声の再生と機械的に同期させやすい数として ",{"type":21,"tag":34,"props":573,"children":574},{},[575],{"type":26,"value":576},"24",{"type":26,"value":578}," が選ばれました。",{"type":21,"tag":22,"props":580,"children":581},{},[582,584,589],{"type":26,"value":583},"24fps が現代まで残っている理由は、もはや技術ではなく",{"type":21,"tag":34,"props":585,"children":586},{},[587],{"type":26,"value":588},"文化",{"type":26,"value":590},"です。",{"type":21,"tag":61,"props":592,"children":593},{},[594,606,611],{"type":21,"tag":65,"props":595,"children":596},{},[597,599,604],{"type":26,"value":598},"100 年近く映画館で 24fps の作品を観てきた観客は、24fps のわずかなブレを「",{"type":21,"tag":34,"props":600,"children":601},{},[602],{"type":26,"value":603},"映画らしい",{"type":26,"value":605},"」と感じる",{"type":21,"tag":65,"props":607,"children":608},{},[609],{"type":26,"value":610},"ストリーミング・配信プラットフォームでも、シネマ作品は 24fps で制作・配信される",{"type":21,"tag":65,"props":612,"children":613},{},[614],{"type":26,"value":615},"「シネマティック」なルックを狙うミュージックビデオ、CM、ドキュメンタリーも 24fps を採用",{"type":21,"tag":22,"props":617,"children":618},{},[619,621,626],{"type":26,"value":620},"少し意外なのは、24fps は技術的には",{"type":21,"tag":34,"props":622,"children":623},{},[624],{"type":26,"value":625},"けっして滑らかではない",{"type":26,"value":627},"ということです。パンや横移動では一目でわかるカクつき（ジャダー）が出ます。それでも「映画らしさ」が勝つから残っている──ある意味、文化的に固定された数字です。",{"type":21,"tag":42,"props":629,"children":631},{"id":630},"_25fps-pal-圏のテレビ標準",[632],{"type":26,"value":633},"25fps — PAL 圏のテレビ標準",{"type":21,"tag":22,"props":635,"children":636},{},[637,642],{"type":21,"tag":34,"props":638,"children":639},{},[640],{"type":26,"value":641},"25fps はヨーロッパや日本（東日本）、オーストラリアなど、電源周波数が 50Hz の地域",{"type":26,"value":643},"で放送向けの標準だった数字です。",{"type":21,"tag":61,"props":645,"children":646},{},[647,652,657],{"type":21,"tag":65,"props":648,"children":649},{},[650],{"type":26,"value":651},"PAL（Phase Alternating Line）方式の白黒テレビが、電源周波数の半分（= 50Hz ÷ 2）を採用",{"type":21,"tag":65,"props":653,"children":654},{},[655],{"type":26,"value":656},"蛍光灯のフリッカー対策としても都合がよかった",{"type":21,"tag":65,"props":658,"children":659},{},[660],{"type":26,"value":661},"「24fps の代用」として映画的な見た目に近く、ヨーロッパ製作のドラマ・映画ではいまだに使われる",{"type":21,"tag":22,"props":663,"children":664},{},[665],{"type":26,"value":666},"放送がデジタルに移行し、地上波の縛りは弱まりましたが、欧州市場向けに作るなら 25fps を選ぶことには合理性があります。",{"type":21,"tag":42,"props":668,"children":670},{"id":669},"_2997fps-と-30fps-ntsc-の落とし子",[671],{"type":26,"value":672},"29.97fps と 30fps — NTSC の落とし子",{"type":21,"tag":22,"props":674,"children":675},{},[676],{"type":26,"value":677},"ここから本題のややこしい話に入ります。",{"type":21,"tag":22,"props":679,"children":680},{},[681,686],{"type":21,"tag":34,"props":682,"children":683},{},[684],{"type":26,"value":685},"30fps は北米・日本（西日本）など 60Hz 地域の放送向けの数字",{"type":26,"value":687},"でした。電源周波数 60Hz の半分の 30Hz を採用していたわけです。",{"type":21,"tag":22,"props":689,"children":690},{},[691,693,698,700,706],{"type":26,"value":692},"ところが、白黒から",{"type":21,"tag":34,"props":694,"children":695},{},[696],{"type":26,"value":697},"カラーテレビ",{"type":26,"value":699},"へ移行する際、音声信号と色信号が干渉しないよう、フレームレートを微妙に下げる必要が出ました。具体的には ",{"type":21,"tag":518,"props":701,"children":703},{"className":702},[],[704],{"type":26,"value":705},"30 × 1000 / 1001 ≈ 29.97fps",{"type":26,"value":707}," に変更されたのです。",{"type":21,"tag":22,"props":709,"children":710},{},[711,713,718],{"type":26,"value":712},"これが「",{"type":21,"tag":34,"props":714,"children":715},{},[716],{"type":26,"value":717},"29.97",{"type":26,"value":719},"」という中途半端な数字の正体です。",{"type":21,"tag":152,"props":721,"children":722},{},[723,739],{"type":21,"tag":156,"props":724,"children":725},{},[726],{"type":21,"tag":160,"props":727,"children":728},{},[729,734],{"type":21,"tag":164,"props":730,"children":731},{},[732],{"type":26,"value":733},"数字",{"type":21,"tag":164,"props":735,"children":736},{},[737],{"type":26,"value":738},"どう発生したか",{"type":21,"tag":178,"props":740,"children":741},{},[742,755],{"type":21,"tag":160,"props":743,"children":744},{},[745,750],{"type":21,"tag":185,"props":746,"children":747},{},[748],{"type":26,"value":749},"30",{"type":21,"tag":185,"props":751,"children":752},{},[753],{"type":26,"value":754},"白黒テレビ時代の北米放送標準（電源 60Hz の半分）",{"type":21,"tag":160,"props":756,"children":757},{},[758,762],{"type":21,"tag":185,"props":759,"children":760},{},[761],{"type":26,"value":717},{"type":21,"tag":185,"props":763,"children":764},{},[765],{"type":26,"value":766},"カラー化に伴う技術調整（音声と色信号の分離のため）",{"type":21,"tag":22,"props":768,"children":769},{},[770,772,778,780,786,788,793],{"type":26,"value":771},"実際の制作現場で ",{"type":21,"tag":518,"props":773,"children":775},{"className":774},[],[776],{"type":26,"value":777},"30fps",{"type":26,"value":779}," と書いてあっても、内実は ",{"type":21,"tag":518,"props":781,"children":783},{"className":782},[],[784],{"type":26,"value":785},"29.97fps",{"type":26,"value":787}," であることがほとんどです。",{"type":21,"tag":34,"props":789,"children":790},{},[791],{"type":26,"value":792},"ちょうど 30.0 が必要な場面は、ウェブやモニター向けのコンテンツに限られます",{"type":26,"value":550},{"type":21,"tag":42,"props":795,"children":797},{"id":796},"_23976fps-映画をテレビで流すための24-の代用",[798],{"type":26,"value":799},"23.976fps — 映画をテレビで流すための「24 の代用」",{"type":21,"tag":22,"props":801,"children":802},{},[803,805,811,813,822],{"type":26,"value":804},"29.97 と同じく、",{"type":21,"tag":518,"props":806,"children":808},{"className":807},[],[809],{"type":26,"value":810},"23.976",{"type":26,"value":812}," という小数点付きの数字もあります。これは ",{"type":21,"tag":34,"props":814,"children":815},{},[816],{"type":21,"tag":518,"props":817,"children":819},{"className":818},[],[820],{"type":26,"value":821},"24 × 1000 / 1001",{"type":26,"value":823},"。NTSC との互換性を保ったまま、映画の 24fps を扱うための調整値です。",{"type":21,"tag":61,"props":825,"children":826},{},[827,832,837],{"type":21,"tag":65,"props":828,"children":829},{},[830],{"type":26,"value":831},"映画館上映 → 厳密に 24fps",{"type":21,"tag":65,"props":833,"children":834},{},[835],{"type":26,"value":836},"テレビ放送・配信 → 23.976fps（カラーテレビ互換）",{"type":21,"tag":65,"props":838,"children":839},{},[840],{"type":26,"value":841},"編集タイムラインも 23.976 で組まれることが多い",{"type":21,"tag":22,"props":843,"children":844},{},[845],{"type":26,"value":846},"「24p で撮影」とメニューに書いてあるカメラの大半は、実際には 23.976 を出力しています。Bフレームの DAW やビデオ NLE で「24p」と「23.976p」が並んでいるのは、この厳密 24 と NTSC 互換 24 を区別するためです。",{"type":21,"tag":42,"props":848,"children":850},{"id":849},"ドロップフレームタイムコード-の意味",[851,853,859],{"type":26,"value":852},"ドロップフレームタイムコード — ",{"type":21,"tag":518,"props":854,"children":856},{"className":855},[],[857],{"type":26,"value":858},";",{"type":26,"value":860}," の意味",{"type":21,"tag":22,"props":862,"children":863},{},[864,866,871],{"type":26,"value":865},"29.97fps の世界では、もうひとつ厄介な現象が起きます。",{"type":21,"tag":34,"props":867,"children":868},{},[869],{"type":26,"value":870},"実時間とフレーム数が一致しなくなる",{"type":26,"value":872},"のです。",{"type":21,"tag":22,"props":874,"children":875},{},[876,878,884,886,891],{"type":26,"value":877},"1 時間（3600 秒）あたり、本来 29.97fps × 3600 = 107,892 フレームのところを、",{"type":21,"tag":518,"props":879,"children":881},{"className":880},[],[882],{"type":26,"value":883},"30fps × 3600 = 108,000",{"type":26,"value":885}," フレームで数えると、",{"type":21,"tag":34,"props":887,"children":888},{},[889],{"type":26,"value":890},"3.6 秒ぶん多くカウント",{"type":26,"value":892},"してしまいます。",{"type":21,"tag":22,"props":894,"children":895},{},[896,898,903],{"type":26,"value":897},"これを補正する仕組みが「",{"type":21,"tag":34,"props":899,"children":900},{},[901],{"type":26,"value":902},"ドロップフレームタイムコード",{"type":26,"value":904},"」です。",{"type":21,"tag":61,"props":906,"children":907},{},[908,921,934],{"type":21,"tag":65,"props":909,"children":910},{},[911,913,919],{"type":26,"value":912},"表記: ",{"type":21,"tag":518,"props":914,"children":916},{"className":915},[],[917],{"type":26,"value":918},"01:00:00;00",{"type":26,"value":920},"（セミコロンを使う）",{"type":21,"tag":65,"props":922,"children":923},{},[924,926,932],{"type":26,"value":925},"通常フレーム: ",{"type":21,"tag":518,"props":927,"children":929},{"className":928},[],[930],{"type":26,"value":931},"01:00:00:00",{"type":26,"value":933},"（コロンのまま）",{"type":21,"tag":65,"props":935,"children":936},{},[937],{"type":26,"value":938},"実時間に合わせて、定期的にフレーム番号を「飛ばす」（実フレームは消えない、番号だけスキップ）",{"type":21,"tag":22,"props":940,"children":941},{},[942,944,949],{"type":26,"value":943},"放送用の納品では、CM や番組の尺を秒単位で正確に合わせる必要があるため、ドロップフレームが必須になります。",{"type":21,"tag":34,"props":945,"children":946},{},[947],{"type":26,"value":948},"Web 配信や自主制作では、ノンドロップでも特に問題は起きません",{"type":26,"value":550},{"type":21,"tag":42,"props":951,"children":953},{"id":952},"_60fps5994fps-なめらかさの代償",[954],{"type":26,"value":955},"60fps（59.94fps）— なめらかさの代償",{"type":21,"tag":22,"props":957,"children":958},{},[959],{"type":26,"value":960},"60fps（実体は 59.94fps であることが多い）は、なめらかな動きを最優先する場面で使われます。",{"type":21,"tag":61,"props":962,"children":963},{},[964,974,984,994],{"type":21,"tag":65,"props":965,"children":966},{},[967,972],{"type":21,"tag":34,"props":968,"children":969},{},[970],{"type":26,"value":971},"スポーツ中継",{"type":26,"value":973}," — 速い動きをはっきり追える",{"type":21,"tag":65,"props":975,"children":976},{},[977,982],{"type":21,"tag":34,"props":978,"children":979},{},[980],{"type":26,"value":981},"ゲーム配信・実況",{"type":26,"value":983}," — 60fps でないと粗が出る",{"type":21,"tag":65,"props":985,"children":986},{},[987,992],{"type":21,"tag":34,"props":988,"children":989},{},[990],{"type":26,"value":991},"アクションカム",{"type":26,"value":993}," — 手ブレや高速被写体に強い",{"type":21,"tag":65,"props":995,"children":996},{},[997,1002],{"type":21,"tag":34,"props":998,"children":999},{},[1000],{"type":26,"value":1001},"iPhone の HDR ビデオ",{"type":26,"value":1003}," — 標準で 60fps 設定されていることもある",{"type":21,"tag":22,"props":1005,"children":1006},{},[1007,1009,1014,1016,1021],{"type":26,"value":1008},"ただし、ここでひとつ注意点があります。60fps の映像を見て",{"type":21,"tag":34,"props":1010,"children":1011},{},[1012],{"type":26,"value":1013},"「テレビドラマっぽい」「リアル過ぎる」",{"type":26,"value":1015},"と感じたことはないでしょうか。これは「",{"type":21,"tag":34,"props":1017,"children":1018},{},[1019],{"type":26,"value":1020},"ソープオペラ効果",{"type":26,"value":1022},"」と呼ばれる現象です。",{"type":21,"tag":22,"props":1024,"children":1025},{},[1026],{"type":26,"value":1027},"長年 24fps の映画に慣れた観客にとって、60fps のなめらかな動きは「日常的」「安っぽい」「ホームビデオっぽい」と感じられやすい。テレビ売り場で見るデモ映像が妙に違和感あるのは、テレビ側の「補間」機能で 60fps 相当に水増しされているからです。",{"type":21,"tag":22,"props":1029,"children":1030},{},[1031,1036],{"type":21,"tag":34,"props":1032,"children":1033},{},[1034],{"type":26,"value":1035},"作品の意図と合わない 60fps は逆効果",{"type":26,"value":1037},"になりうる、というのは押さえておく価値があります。",{"type":21,"tag":42,"props":1039,"children":1041},{"id":1040},"_120fps-240fps-スロー再生のための高速捕捉",[1042],{"type":26,"value":1043},"120fps / 240fps — スロー再生のための高速捕捉",{"type":21,"tag":22,"props":1045,"children":1046},{},[1047],{"type":26,"value":1048},"120fps や 240fps は、再生時にスローモーションにする前提で撮影します。",{"type":21,"tag":61,"props":1050,"children":1051},{},[1052,1062],{"type":21,"tag":65,"props":1053,"children":1054},{},[1055,1057],{"type":26,"value":1056},"120fps で撮って 24fps で再生 → ",{"type":21,"tag":34,"props":1058,"children":1059},{},[1060],{"type":26,"value":1061},"5 倍スロー",{"type":21,"tag":65,"props":1063,"children":1064},{},[1065,1067],{"type":26,"value":1066},"240fps で撮って 24fps で再生 → ",{"type":21,"tag":34,"props":1068,"children":1069},{},[1070],{"type":26,"value":1071},"10 倍スロー",{"type":21,"tag":22,"props":1073,"children":1074},{},[1075,1077,1082,1084,1091],{"type":26,"value":1076},"ハイフレームレート撮影では、各フレームの露光時間が短くなるため、",{"type":21,"tag":34,"props":1078,"children":1079},{},[1080],{"type":26,"value":1081},"明るさが厳しくなる",{"type":26,"value":1083},"点に注意が必要です。また、シャッター角度の 180° ルールも維持するのが基本（",{"type":21,"tag":1085,"props":1086,"children":1088},"a",{"href":1087},"/ja/articles/shutter-angle-explained",[1089],{"type":26,"value":1090},"シャッター角度入門",{"type":26,"value":1092},"）。",{"type":21,"tag":22,"props":1094,"children":1095},{},[1096],{"type":26,"value":1097},"スロー再生を狙わない 120fps での「通常再生」はあまり意味がありません。なめらかさは増しますが、上で述べたソープオペラ効果が一気に強く出ます。",{"type":21,"tag":42,"props":1099,"children":1101},{"id":1100},"vfr-と-cfr-スマホ動画の地雷",[1102],{"type":26,"value":1103},"VFR と CFR — スマホ動画の地雷",{"type":21,"tag":22,"props":1105,"children":1106},{},[1107,1109,1114],{"type":26,"value":1108},"ここまでは「固定フレームレート（CFR: Constant Frame Rate）」を前提に話してきましたが、スマートフォンや一部のアクションカムは ",{"type":21,"tag":34,"props":1110,"children":1111},{},[1112],{"type":26,"value":1113},"VFR（Variable Frame Rate、可変フレームレート）",{"type":26,"value":1115}," で記録することがあります。",{"type":21,"tag":61,"props":1117,"children":1118},{},[1119,1129],{"type":21,"tag":65,"props":1120,"children":1121},{},[1122,1127],{"type":21,"tag":34,"props":1123,"children":1124},{},[1125],{"type":26,"value":1126},"CFR",{"type":26,"value":1128}," — 毎秒ぴったり 30 枚（または指定の枚数）を出力",{"type":21,"tag":65,"props":1130,"children":1131},{},[1132,1137],{"type":21,"tag":34,"props":1133,"children":1134},{},[1135],{"type":26,"value":1136},"VFR",{"type":26,"value":1138}," — シーンの明るさや負荷に応じて、リアルタイムでフレームレートが変動する",{"type":21,"tag":22,"props":1140,"children":1141},{},[1142,1144,1149],{"type":26,"value":1143},"VFR の動画は、再生だけなら問題ありません。ただし",{"type":21,"tag":34,"props":1145,"children":1146},{},[1147],{"type":26,"value":1148},"編集ソフトに取り込むと、音声と映像がずれる・カット精度が落ちる",{"type":26,"value":1150},"といった問題を起こすことがあります。",{"type":21,"tag":61,"props":1152,"children":1153},{},[1154,1159,1164],{"type":21,"tag":65,"props":1155,"children":1156},{},[1157],{"type":26,"value":1158},"iPhone の 4K 60fps は条件次第で VFR になりやすい",{"type":21,"tag":65,"props":1160,"children":1161},{},[1162],{"type":26,"value":1163},"DaVinci Resolve や Premiere Pro は VFR を「最も近い CFR」に解釈して読み込む",{"type":21,"tag":65,"props":1165,"children":1166},{},[1167,1169,1175,1177,1183,1185,1190],{"type":26,"value":1168},"安全策は、編集前に ",{"type":21,"tag":518,"props":1170,"children":1172},{"className":1171},[],[1173],{"type":26,"value":1174},"HandBrake",{"type":26,"value":1176}," や ",{"type":21,"tag":518,"props":1178,"children":1180},{"className":1179},[],[1181],{"type":26,"value":1182},"FFmpeg",{"type":26,"value":1184}," で ",{"type":21,"tag":34,"props":1186,"children":1187},{},[1188],{"type":26,"value":1189},"CFR に変換",{"type":26,"value":1191},"しておくこと",{"type":21,"tag":22,"props":1193,"children":1194},{},[1195,1197,1202],{"type":26,"value":1196},"ライブラリにスマホ素材を含む場合、フレームレートだけでなく ",{"type":21,"tag":34,"props":1198,"children":1199},{},[1200],{"type":26,"value":1201},"CFR / VFR の別",{"type":26,"value":1203},"も把握しておくと事故が減ります。",{"type":21,"tag":42,"props":1205,"children":1207},{"id":1206},"どれを選ぶか-用途別の指針",[1208],{"type":26,"value":1209},"どれを選ぶか — 用途別の指針",{"type":21,"tag":22,"props":1211,"children":1212},{},[1213],{"type":26,"value":1214},"迷ったときの目安は次のとおりです。",{"type":21,"tag":152,"props":1216,"children":1217},{},[1218,1234],{"type":21,"tag":156,"props":1219,"children":1220},{},[1221],{"type":21,"tag":160,"props":1222,"children":1223},{},[1224,1229],{"type":21,"tag":164,"props":1225,"children":1226},{},[1227],{"type":26,"value":1228},"用途",{"type":21,"tag":164,"props":1230,"children":1231},{},[1232],{"type":26,"value":1233},"おすすめフレームレート",{"type":21,"tag":178,"props":1235,"children":1236},{},[1237,1253,1269,1285,1301,1317],{"type":21,"tag":160,"props":1238,"children":1239},{},[1240,1245],{"type":21,"tag":185,"props":1241,"children":1242},{},[1243],{"type":26,"value":1244},"映画的なルックの作品",{"type":21,"tag":185,"props":1246,"children":1247},{},[1248],{"type":21,"tag":34,"props":1249,"children":1250},{},[1251],{"type":26,"value":1252},"24fps（または 23.976）",{"type":21,"tag":160,"props":1254,"children":1255},{},[1256,1261],{"type":21,"tag":185,"props":1257,"children":1258},{},[1259],{"type":26,"value":1260},"ヨーロッパ向けの放送・配信",{"type":21,"tag":185,"props":1262,"children":1263},{},[1264],{"type":21,"tag":34,"props":1265,"children":1266},{},[1267],{"type":26,"value":1268},"25fps",{"type":21,"tag":160,"props":1270,"children":1271},{},[1272,1277],{"type":21,"tag":185,"props":1273,"children":1274},{},[1275],{"type":26,"value":1276},"北米向け・YouTube 標準",{"type":21,"tag":185,"props":1278,"children":1279},{},[1280],{"type":21,"tag":34,"props":1281,"children":1282},{},[1283],{"type":26,"value":1284},"29.97 または 30fps",{"type":21,"tag":160,"props":1286,"children":1287},{},[1288,1293],{"type":21,"tag":185,"props":1289,"children":1290},{},[1291],{"type":26,"value":1292},"スポーツ・ゲーム・アクション",{"type":21,"tag":185,"props":1294,"children":1295},{},[1296],{"type":21,"tag":34,"props":1297,"children":1298},{},[1299],{"type":26,"value":1300},"60fps（59.94）",{"type":21,"tag":160,"props":1302,"children":1303},{},[1304,1309],{"type":21,"tag":185,"props":1305,"children":1306},{},[1307],{"type":26,"value":1308},"スローモーション素材",{"type":21,"tag":185,"props":1310,"children":1311},{},[1312],{"type":21,"tag":34,"props":1313,"children":1314},{},[1315],{"type":26,"value":1316},"120 / 240fps",{"type":21,"tag":160,"props":1318,"children":1319},{},[1320,1325],{"type":21,"tag":185,"props":1321,"children":1322},{},[1323],{"type":26,"value":1324},"ドキュメンタリー",{"type":21,"tag":185,"props":1326,"children":1327},{},[1328],{"type":26,"value":1329},"24 か 30 を選ぶ（作品全体で固定）",{"type":21,"tag":22,"props":1331,"children":1332},{},[1333,1335,1340],{"type":26,"value":1334},"最重要は「",{"type":21,"tag":34,"props":1336,"children":1337},{},[1338],{"type":26,"value":1339},"一作品の中でフレームレートを混ぜすぎない",{"type":26,"value":1341},"」こと。やむを得ず混在する場合（24fps メイン + 120fps スロー素材）、編集タイムラインを 24fps に統一し、スロー素材は速度変換して読み込みます。",{"type":21,"tag":42,"props":1343,"children":1345},{"id":1344},"フレームレートとシャッター角度の関係",[1346],{"type":26,"value":1344},{"type":21,"tag":22,"props":1348,"children":1349},{},[1350,1352,1357],{"type":26,"value":1351},"フレームレートとシャッタースピードは、別々に決めるものではありません。互いに紐付いた設定です。",{"type":21,"tag":34,"props":1353,"children":1354},{},[1355],{"type":26,"value":1356},"180° ルール",{"type":26,"value":1358},"（シャッタースピード = フレームレートの倍）を守れば、フレームレートを変えても動きの自然さは保たれます。",{"type":21,"tag":61,"props":1360,"children":1361},{},[1362,1367,1372,1377],{"type":21,"tag":65,"props":1363,"children":1364},{},[1365],{"type":26,"value":1366},"24fps + 1/50 秒",{"type":21,"tag":65,"props":1368,"children":1369},{},[1370],{"type":26,"value":1371},"30fps + 1/60 秒",{"type":21,"tag":65,"props":1373,"children":1374},{},[1375],{"type":26,"value":1376},"60fps + 1/120 秒",{"type":21,"tag":65,"props":1378,"children":1379},{},[1380],{"type":26,"value":1381},"120fps + 1/240 秒",{"type":21,"tag":22,"props":1383,"children":1384},{},[1385,1387,1391],{"type":26,"value":1386},"この対応関係を理解した上で fps を選ぶと、「速いシャッターでカクついた動画」になる事故が一気に減ります。詳しくは姉妹記事の",{"type":21,"tag":1085,"props":1388,"children":1389},{"href":1087},[1390],{"type":26,"value":1090},{"type":26,"value":1392},"を参照してください。",{"type":21,"tag":42,"props":1394,"children":1396},{"id":1395},"フレームレートはメタデータに残る",[1397],{"type":26,"value":1395},{"type":21,"tag":22,"props":1399,"children":1400},{},[1401,1403,1408,1410,1416,1417,1423],{"type":26,"value":1402},"撮影したフレームレートは、動画ファイルの",{"type":21,"tag":34,"props":1404,"children":1405},{},[1406],{"type":26,"value":1407},"コンテナレベル",{"type":26,"value":1409},"で確実に記録されます。",{"type":21,"tag":518,"props":1411,"children":1413},{"className":1412},[],[1414],{"type":26,"value":1415},"ffprobe",{"type":26,"value":1176},{"type":21,"tag":518,"props":1418,"children":1420},{"className":1419},[],[1421],{"type":26,"value":1422},"ExifTool",{"type":26,"value":1424}," で簡単に読み出せる項目です。",{"type":21,"tag":61,"props":1426,"children":1427},{},[1428,1433,1438],{"type":21,"tag":65,"props":1429,"children":1430},{},[1431],{"type":26,"value":1432},"名目フレームレート（メニューで選んだ値）",{"type":21,"tag":65,"props":1434,"children":1435},{},[1436],{"type":26,"value":1437},"実フレームレート（VFR の場合の平均）",{"type":21,"tag":65,"props":1439,"children":1440},{},[1441],{"type":26,"value":1442},"タイムコード基準フレームレート",{"type":21,"tag":22,"props":1444,"children":1445},{},[1446,1448,1454],{"type":26,"value":1447},"詳しくは",{"type":21,"tag":1085,"props":1449,"children":1451},{"href":1450},"/ja/articles/video-metadata-and-exif",[1452],{"type":26,"value":1453},"動画にも EXIF はある？",{"type":26,"value":1455},"で触れた通りで、ライブラリ全体を横断してフレームレートを把握する基盤になっています。",{"type":21,"tag":42,"props":1457,"children":1459},{"id":1458},"videotagger-はフレームレートで横断検索できる",[1460],{"type":26,"value":1461},"VideoTagger はフレームレートで横断検索できる",{"type":21,"tag":22,"props":1463,"children":1464},{},[1465,1467,1472],{"type":26,"value":1466},"VideoTagger は取り込み時に動画の ",{"type":21,"tag":34,"props":1468,"children":1469},{},[1470],{"type":26,"value":1471},"FPS を自動抽出",{"type":26,"value":1473},"し、ライブラリ全体を fps 範囲で絞り込むことができます。",{"type":21,"tag":61,"props":1475,"children":1476},{},[1477,1482,1487],{"type":21,"tag":65,"props":1478,"children":1479},{},[1480],{"type":26,"value":1481},"「24fps で撮ったシネマ素材だけを集めて、ある作品の候補にしたい」",{"type":21,"tag":65,"props":1483,"children":1484},{},[1485],{"type":26,"value":1486},"「60fps の素材だけ抜き出してスロー編集に回したい」",{"type":21,"tag":65,"props":1488,"children":1489},{},[1490],{"type":26,"value":1491},"「29.97 と 30 が混在しているライブラリで、ちょうど 30fps の素材を見つけたい」",{"type":21,"tag":22,"props":1493,"children":1494},{},[1495,1497,1502],{"type":26,"value":1496},"ファイル名やフォルダで管理していると、これらの絞り込みはほぼ不可能です。",{"type":21,"tag":34,"props":1498,"children":1499},{},[1500],{"type":26,"value":1501},"「フレームレートで絞り込み可能」というだけで、ライブラリの使い勝手は別物",{"type":26,"value":1503},"になります。撮影者・カメラが混在する大規模アーカイブほど効果が大きい部分です。",{"type":21,"tag":42,"props":1505,"children":1506},{"id":427},[1507],{"type":26,"value":427},{"type":21,"tag":61,"props":1509,"children":1510},{},[1511,1516,1521,1526,1531,1536,1541],{"type":21,"tag":65,"props":1512,"children":1513},{},[1514],{"type":26,"value":1515},"24fps は映画の標準、文化的に「映画らしさ」として定着した数字",{"type":21,"tag":65,"props":1517,"children":1518},{},[1519],{"type":26,"value":1520},"25 / 29.97 / 30 はテレビ放送の歴史、特に NTSC カラーテレビの事情で生まれた数字",{"type":21,"tag":65,"props":1522,"children":1523},{},[1524],{"type":26,"value":1525},"23.976 / 29.97 などの小数点付きは、白黒からカラーへの互換調整の結果",{"type":21,"tag":65,"props":1527,"children":1528},{},[1529],{"type":26,"value":1530},"60fps はなめらかだが、文脈によっては「テレビっぽい」効果が出る",{"type":21,"tag":65,"props":1532,"children":1533},{},[1534],{"type":26,"value":1535},"120 / 240fps はスローモーション素材専用と考えるのが安全",{"type":21,"tag":65,"props":1537,"children":1538},{},[1539],{"type":26,"value":1540},"VFR はスマホ素材の地雷、編集前に CFR 変換を検討する",{"type":21,"tag":65,"props":1542,"children":1543},{},[1544],{"type":26,"value":1545},"一作品内で fps は混ぜすぎない、混ぜる場合はタイムラインを基準に統一する",{"type":21,"tag":22,"props":1547,"children":1548},{},[1549,1551,1556],{"type":26,"value":1550},"フレームレートの選択は技術ではなく",{"type":21,"tag":34,"props":1552,"children":1553},{},[1554],{"type":26,"value":1555},"表現",{"type":26,"value":1557},"です。数字の意味を知ったうえで意図して選べば、それだけで作品のトーンは安定します。",{"title":7,"searchDepth":455,"depth":455,"links":1559},[1560,1561,1562,1563,1564,1565,1567,1568,1569,1570,1571,1572,1573,1574],{"id":509,"depth":455,"text":509},{"id":558,"depth":455,"text":561},{"id":630,"depth":455,"text":633},{"id":669,"depth":455,"text":672},{"id":796,"depth":455,"text":799},{"id":849,"depth":455,"text":1566},"ドロップフレームタイムコード — ; の意味",{"id":952,"depth":455,"text":955},{"id":1040,"depth":455,"text":1043},{"id":1100,"depth":455,"text":1103},{"id":1206,"depth":455,"text":1209},{"id":1344,"depth":455,"text":1344},{"id":1395,"depth":455,"text":1395},{"id":1458,"depth":455,"text":1461},{"id":427,"depth":455,"text":427},"content:articles:ja:frame-rate-basics.md","articles/ja/frame-rate-basics.md","articles/ja/frame-rate-basics",{"_path":1579,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":1580,"description":1581,"slug":1582,"date":1583,"category":12,"tags":1584,"body":1587,"_type":464,"_id":2306,"_source":466,"_file":2307,"_stem":2308,"_extension":469},"/articles/ja/shutter-angle-explained","シャッター角度入門 — 180°ルールと「動画らしい動き」のつくり方","シャッタースピードを写真感覚で 1/1000 に上げて撮ったら、再生したときカクついた。動画では「明るさ」ではなく「動きの見え方」を決めるのがシャッターです。シャッター角度・180°ルール・フレームレートとの関係を、現場で迷わないレベルまで整理します。","shutter-angle-explained","2026-05-19",[14,1585,1586,479],"cinematography","shutter",{"type":18,"children":1588,"toc":2290},[1589,1601,1613,1618,1623,1662,1667,1676,1681,1689,1701,1707,1719,1731,1743,1749,1754,1848,1868,1874,1879,1886,1911,1917,1942,1954,1959,1964,1980,1999,2011,2016,2021,2051,2063,2068,2080,2093,2105,2123,2135,2140,2168,2187,2193,2212,2230,2235,2239,2285],{"type":21,"tag":22,"props":1590,"children":1591},{},[1592,1594,1599],{"type":26,"value":1593},"写真でシャッタースピードを上げれば、動きが止まってシャープに写ります。動画でも同じ感覚で 1/1000 に設定したら、",{"type":21,"tag":34,"props":1595,"children":1596},{},[1597],{"type":26,"value":1598},"再生したらやたらにカクつく映像になった",{"type":26,"value":1600},"。──そんな経験はありませんか。",{"type":21,"tag":22,"props":1602,"children":1603},{},[1604,1606,1611],{"type":26,"value":1605},"動画のシャッタースピードは、写真と意味が少し違います。「明るさ」よりも「",{"type":21,"tag":34,"props":1607,"children":1608},{},[1609],{"type":26,"value":1610},"動きがどう見えるか",{"type":26,"value":1612},"」を決めるパラメータです。この記事では、シャッター角度の考え方、180°ルール、フレームレートとの関係を整理します。",{"type":21,"tag":42,"props":1614,"children":1616},{"id":1615},"シャッター速度とシャッター角度は同じことを言っている",[1617],{"type":26,"value":1615},{"type":21,"tag":22,"props":1619,"children":1620},{},[1621],{"type":26,"value":1622},"映画やシネマカメラの世界で語られる「シャッター角度（Shutter Angle）」は、写真の「シャッター速度」と同じ現象を、別の単位で表したものです。",{"type":21,"tag":61,"props":1624,"children":1625},{},[1626,1644],{"type":21,"tag":65,"props":1627,"children":1628},{},[1629,1634,1636,1642],{"type":21,"tag":34,"props":1630,"children":1631},{},[1632],{"type":26,"value":1633},"シャッター速度",{"type":26,"value":1635}," — 1 フレームのうち、何秒露光するか（",{"type":21,"tag":518,"props":1637,"children":1639},{"className":1638},[],[1640],{"type":26,"value":1641},"1/50",{"type":26,"value":1643}," 秒など）",{"type":21,"tag":65,"props":1645,"children":1646},{},[1647,1652,1654,1660],{"type":21,"tag":34,"props":1648,"children":1649},{},[1650],{"type":26,"value":1651},"シャッター角度",{"type":26,"value":1653}," — 1 フレームのうち、何度ぶん露光するか（",{"type":21,"tag":518,"props":1655,"children":1657},{"className":1656},[],[1658],{"type":26,"value":1659},"180°",{"type":26,"value":1661}," など）",{"type":21,"tag":22,"props":1663,"children":1664},{},[1665],{"type":26,"value":1666},"換算式はシンプルです：",{"type":21,"tag":1668,"props":1669,"children":1671},"pre",{"code":1670},"シャッター速度 = 1 / (フレームレート × 360 / シャッター角度)\n",[1672],{"type":21,"tag":518,"props":1673,"children":1674},{"__ignoreMap":7},[1675],{"type":26,"value":1670},{"type":21,"tag":22,"props":1677,"children":1678},{},[1679],{"type":26,"value":1680},"たとえば 24fps・180° なら：",{"type":21,"tag":1668,"props":1682,"children":1684},{"code":1683},"1 / (24 × 360 / 180) = 1 / 48 ≒ 1/50 秒\n",[1685],{"type":21,"tag":518,"props":1686,"children":1687},{"__ignoreMap":7},[1688],{"type":26,"value":1683},{"type":21,"tag":22,"props":1690,"children":1691},{},[1692,1694,1699],{"type":26,"value":1693},"つまり「24fps で 180°」と「24fps で 1/50 秒」はおおむね同じ意味です。なぜ角度で表現するかというと、フィルム映画時代の機械式回転シャッターが",{"type":21,"tag":34,"props":1695,"children":1696},{},[1697],{"type":26,"value":1698},"円盤に開口部を切ったもの",{"type":26,"value":1700},"だったから。180° = 円盤の半分が開いている、というそのままの意味です。",{"type":21,"tag":42,"props":1702,"children":1704},{"id":1703},"_180ルール-シャッター角度の標準",[1705],{"type":26,"value":1706},"180°ルール — シャッター角度の「標準」",{"type":21,"tag":22,"props":1708,"children":1709},{},[1710,1712,1717],{"type":26,"value":1711},"映画の世界には、「",{"type":21,"tag":34,"props":1713,"children":1714},{},[1715],{"type":26,"value":1716},"シャッター角度は 180° を基本にする",{"type":26,"value":1718},"」という慣習があります。これが俗に言う「180° ルール」です。",{"type":21,"tag":22,"props":1720,"children":1721},{},[1722,1724,1729],{"type":26,"value":1723},"なぜか。シャッター角度が小さい（= シャッター速度が速い）と各フレームの露光時間が短くなり、",{"type":21,"tag":34,"props":1725,"children":1726},{},[1727],{"type":26,"value":1728},"動きのあるシーンで被写体ブレが消える",{"type":26,"value":1730},"。人間の目はその「ブレのない動き」を、再生時にカクついた・パラパラ漫画的なものとして知覚します。逆に角度が大きすぎると、ブレすぎて読めない絵になります。",{"type":21,"tag":22,"props":1732,"children":1733},{},[1734,1736,1741],{"type":26,"value":1735},"180° は、その中間で",{"type":21,"tag":34,"props":1737,"children":1738},{},[1739],{"type":26,"value":1740},"自然な動きに見えやすい",{"type":26,"value":1742},"ポイントとして長年使われてきた値です。映画らしさ、ドキュメンタリーらしさ、テレビらしさ──いわゆる「動画らしい動き」のベースラインだと考えてください。",{"type":21,"tag":42,"props":1744,"children":1746},{"id":1745},"フレームレート別のだいたいの正解",[1747],{"type":26,"value":1748},"フレームレート別の「だいたいの正解」",{"type":21,"tag":22,"props":1750,"children":1751},{},[1752],{"type":26,"value":1753},"180° ルールに従うと、フレームレートごとのシャッター速度はこうなります。",{"type":21,"tag":152,"props":1755,"children":1756},{},[1757,1773],{"type":21,"tag":156,"props":1758,"children":1759},{},[1760],{"type":21,"tag":160,"props":1761,"children":1762},{},[1763,1768],{"type":21,"tag":164,"props":1764,"children":1765},{},[1766],{"type":26,"value":1767},"フレームレート",{"type":21,"tag":164,"props":1769,"children":1770},{},[1771],{"type":26,"value":1772},"シャッター角度 180° のとき",{"type":21,"tag":178,"props":1774,"children":1775},{},[1776,1794,1809,1822,1835],{"type":21,"tag":160,"props":1777,"children":1778},{},[1779,1784],{"type":21,"tag":185,"props":1780,"children":1781},{},[1782],{"type":26,"value":1783},"24 fps",{"type":21,"tag":185,"props":1785,"children":1786},{},[1787,1789],{"type":26,"value":1788},"1/48 ≒ ",{"type":21,"tag":34,"props":1790,"children":1791},{},[1792],{"type":26,"value":1793},"1/50 秒",{"type":21,"tag":160,"props":1795,"children":1796},{},[1797,1802],{"type":21,"tag":185,"props":1798,"children":1799},{},[1800],{"type":26,"value":1801},"25 fps（PAL）",{"type":21,"tag":185,"props":1803,"children":1804},{},[1805],{"type":21,"tag":34,"props":1806,"children":1807},{},[1808],{"type":26,"value":1793},{"type":21,"tag":160,"props":1810,"children":1811},{},[1812,1817],{"type":21,"tag":185,"props":1813,"children":1814},{},[1815],{"type":26,"value":1816},"30 fps（NTSC、29.97）",{"type":21,"tag":185,"props":1818,"children":1819},{},[1820],{"type":26,"value":1821},"1/60 秒",{"type":21,"tag":160,"props":1823,"children":1824},{},[1825,1830],{"type":21,"tag":185,"props":1826,"children":1827},{},[1828],{"type":26,"value":1829},"60 fps",{"type":21,"tag":185,"props":1831,"children":1832},{},[1833],{"type":26,"value":1834},"1/120 秒",{"type":21,"tag":160,"props":1836,"children":1837},{},[1838,1843],{"type":21,"tag":185,"props":1839,"children":1840},{},[1841],{"type":26,"value":1842},"120 fps",{"type":21,"tag":185,"props":1844,"children":1845},{},[1846],{"type":26,"value":1847},"1/240 秒",{"type":21,"tag":22,"props":1849,"children":1850},{},[1851,1853,1858,1860,1866],{"type":26,"value":1852},"「迷ったら ",{"type":21,"tag":34,"props":1854,"children":1855},{},[1856],{"type":26,"value":1857},"フレームレートの倍",{"type":26,"value":1859}," を分母に」と覚えておけば、ほとんどの場面で大きく外しません。フレームレートそのものの意味と選び方は、姉妹記事の",{"type":21,"tag":1085,"props":1861,"children":1863},{"href":1862},"/ja/articles/frame-rate-basics",[1864],{"type":26,"value":1865},"フレームレート入門",{"type":26,"value":1867},"で詳しく整理しています。",{"type":21,"tag":42,"props":1869,"children":1871},{"id":1870},"_180-から外すと何が起きるか",[1872],{"type":26,"value":1873},"180° から外すと何が起きるか",{"type":21,"tag":22,"props":1875,"children":1876},{},[1877],{"type":26,"value":1878},"ルールはあくまで起点で、意図して外すことに意味がある場合もあります。",{"type":21,"tag":1880,"props":1881,"children":1883},"h3",{"id":1882},"角度を小さくする速いシャッター例4590",[1884],{"type":26,"value":1885},"角度を小さくする（速いシャッター・例：45°、90°）",{"type":21,"tag":61,"props":1887,"children":1888},{},[1889,1901,1906],{"type":21,"tag":65,"props":1890,"children":1891},{},[1892,1894,1899],{"type":26,"value":1893},"各フレームがシャープになり、動きが",{"type":21,"tag":34,"props":1895,"children":1896},{},[1897],{"type":26,"value":1898},"スタッカート（カクカク）に",{"type":26,"value":1900},"見える",{"type":21,"tag":65,"props":1902,"children":1903},{},[1904],{"type":26,"value":1905},"戦闘シーン、爆発、緊迫感の演出に使われる（『プライベート・ライアン』の冒頭が有名）",{"type":21,"tag":65,"props":1907,"children":1908},{},[1909],{"type":26,"value":1910},"スポーツ番組はスローモーション再生の都合で速めに設定する場合あり",{"type":21,"tag":1880,"props":1912,"children":1914},{"id":1913},"角度を大きくする遅いシャッター例270360",[1915],{"type":26,"value":1916},"角度を大きくする（遅いシャッター・例：270°、360°）",{"type":21,"tag":61,"props":1918,"children":1919},{},[1920,1932,1937],{"type":21,"tag":65,"props":1921,"children":1922},{},[1923,1925,1930],{"type":26,"value":1924},"動きが",{"type":21,"tag":34,"props":1926,"children":1927},{},[1928],{"type":26,"value":1929},"ブレて流れる",{"type":26,"value":1931},"ようになり、夢のような・酔ったような感覚",{"type":21,"tag":65,"props":1933,"children":1934},{},[1935],{"type":26,"value":1936},"暗い環境で光量を稼ぐ目的でも使われる",{"type":21,"tag":65,"props":1938,"children":1939},{},[1940],{"type":26,"value":1941},"やりすぎると単に被写体ブレで読みにくい絵になるので注意",{"type":21,"tag":22,"props":1943,"children":1944},{},[1945,1947,1952],{"type":26,"value":1946},"「180° = 基本」「45〜90° = 緊迫感」「270〜360° = 浮遊感」というふうに、",{"type":21,"tag":34,"props":1948,"children":1949},{},[1950],{"type":26,"value":1951},"演出の意図と紐付けて使い分ける",{"type":26,"value":1953},"のが本来の使い方です。",{"type":21,"tag":42,"props":1955,"children":1957},{"id":1956},"明るさを変えたい時に陥りやすい罠",[1958],{"type":26,"value":1956},{"type":21,"tag":22,"props":1960,"children":1961},{},[1962],{"type":26,"value":1963},"ここが写真出身者にとって最大の落とし穴です。",{"type":21,"tag":1965,"props":1966,"children":1967},"blockquote",{},[1968],{"type":21,"tag":22,"props":1969,"children":1970},{},[1971,1973,1978],{"type":26,"value":1972},"屋外で明るすぎる → 写真の感覚で ",{"type":21,"tag":34,"props":1974,"children":1975},{},[1976],{"type":26,"value":1977},"シャッター速度を上げて対応",{"type":26,"value":1979}," → 動きがカクついた映像になる",{"type":21,"tag":22,"props":1981,"children":1982},{},[1983,1985,1990,1992,1997],{"type":26,"value":1984},"正解は「シャッターは触らず、",{"type":21,"tag":34,"props":1986,"children":1987},{},[1988],{"type":26,"value":1989},"ND フィルターで光量を落とす",{"type":26,"value":1991},"」です。動画におけるシャッター速度は、写真でいう絞り値や ISO に並ぶ「単なる露出パラメータ」ではなく、",{"type":21,"tag":34,"props":1993,"children":1994},{},[1995],{"type":26,"value":1996},"動きの見え方そのもの",{"type":26,"value":1998},"を決める設定だからです。",{"type":21,"tag":22,"props":2000,"children":2001},{},[2002,2004,2009],{"type":26,"value":2003},"これが、シネマカメラやハイエンドのミラーレスに",{"type":21,"tag":34,"props":2005,"children":2006},{},[2007],{"type":26,"value":2008},"内蔵 ND",{"type":26,"value":2010}," が搭載されている理由でもあります。シャッターを 180° に固定したまま、明るさだけを下げる──これが動画の標準的なやり方です。",{"type":21,"tag":42,"props":2012,"children":2014},{"id":2013},"ハイフレームレート撮影での扱い",[2015],{"type":26,"value":2013},{"type":21,"tag":22,"props":2017,"children":2018},{},[2019],{"type":26,"value":2020},"スローモーションのために 120fps や 240fps で撮るとき、シャッター角度はどうするか。",{"type":21,"tag":61,"props":2022,"children":2023},{},[2024,2034,2039],{"type":21,"tag":65,"props":2025,"children":2026},{},[2027,2032],{"type":21,"tag":34,"props":2028,"children":2029},{},[2030],{"type":26,"value":2031},"基本は 180° ルールを維持",{"type":26,"value":2033}," — 120fps なら 1/240 秒、240fps なら 1/480 秒",{"type":21,"tag":65,"props":2035,"children":2036},{},[2037],{"type":26,"value":2038},"高速シャッターになるので、被写体ブレは元々少ない",{"type":21,"tag":65,"props":2040,"children":2041},{},[2042,2044,2049],{"type":26,"value":2043},"暗所では明るさが足りなくなりやすい。",{"type":21,"tag":34,"props":2045,"children":2046},{},[2047],{"type":26,"value":2048},"照明か感度で対応",{"type":26,"value":2050},"、シャッターは触らない",{"type":21,"tag":22,"props":2052,"children":2053},{},[2054,2056,2061],{"type":26,"value":2055},"スロー再生を前提とした素材は、再生時に各フレームをじっくり見るので、シャープに撮るほうが結果として奇麗です。ここでは「180° で",{"type":21,"tag":34,"props":2057,"children":2058},{},[2059],{"type":26,"value":2060},"結果的に",{"type":26,"value":2062},"速いシャッター」になっているのを許容してください。",{"type":21,"tag":42,"props":2064,"children":2066},{"id":2065},"フリッカー対策との両立",[2067],{"type":26,"value":2065},{"type":21,"tag":22,"props":2069,"children":2070},{},[2071,2073,2078],{"type":26,"value":2072},"蛍光灯・LED 照明の下では、",{"type":21,"tag":34,"props":2074,"children":2075},{},[2076],{"type":26,"value":2077},"電源周波数とシャッター速度の関係",{"type":26,"value":2079},"でフリッカー（明滅）が出ることがあります。",{"type":21,"tag":61,"props":2081,"children":2082},{},[2083,2088],{"type":21,"tag":65,"props":2084,"children":2085},{},[2086],{"type":26,"value":2087},"50Hz 地域（日本の東日本、欧州など） → 1/50, 1/100 が安全",{"type":21,"tag":65,"props":2089,"children":2090},{},[2091],{"type":26,"value":2092},"60Hz 地域（日本の西日本、北米など） → 1/60, 1/120 が安全",{"type":21,"tag":22,"props":2094,"children":2095},{},[2096,2098,2103],{"type":26,"value":2097},"180° ルールと電源周波数が",{"type":21,"tag":34,"props":2099,"children":2100},{},[2101],{"type":26,"value":2102},"ぶつかる",{"type":26,"value":2104},"フレームレート（たとえば 60Hz 地域での 24fps、1/50 秒）では、フリッカーが出ます。この場合：",{"type":21,"tag":61,"props":2106,"children":2107},{},[2108,2113,2118],{"type":21,"tag":65,"props":2109,"children":2110},{},[2111],{"type":26,"value":2112},"フレームレートを 25fps（PAL）に変える",{"type":21,"tag":65,"props":2114,"children":2115},{},[2116],{"type":26,"value":2117},"一段速い／遅いシャッター速度に切り替える（角度は若干ズレる）",{"type":21,"tag":65,"props":2119,"children":2120},{},[2121],{"type":26,"value":2122},"撮影現場の照明を交換する",{"type":21,"tag":22,"props":2124,"children":2125},{},[2126,2128,2133],{"type":26,"value":2127},"のどれかで対応します。",{"type":21,"tag":34,"props":2129,"children":2130},{},[2131],{"type":26,"value":2132},"シャッター角度をどこまで厳密に守るかは、絵作りの優先度と相談",{"type":26,"value":2134},"になります。",{"type":21,"tag":42,"props":2136,"children":2138},{"id":2137},"撮影設定はメタデータに残ることがある",[2139],{"type":26,"value":2137},{"type":21,"tag":22,"props":2141,"children":2142},{},[2143,2145,2150,2152,2158,2160,2166],{"type":26,"value":2144},"業務機やシネマカメラの多くは、",{"type":21,"tag":34,"props":2146,"children":2147},{},[2148],{"type":26,"value":2149},"シャッター速度や角度を撮影時にメタデータとして記録",{"type":26,"value":2151},"します。Sony の業務機が出す ",{"type":21,"tag":518,"props":2153,"children":2155},{"className":2154},[],[2156],{"type":26,"value":2157},".XML",{"type":26,"value":2159}," サイドカー、ARRI の ",{"type":21,"tag":518,"props":2161,"children":2163},{"className":2162},[],[2164],{"type":26,"value":2165},".ALE",{"type":26,"value":2167},"、最近のミラーレスでも機種によっては MP4 のメタデータ領域に書き込まれます。",{"type":21,"tag":22,"props":2169,"children":2170},{},[2171,2173,2178,2180,2185],{"type":26,"value":2172},"詳しくは姉妹記事の",{"type":21,"tag":1085,"props":2174,"children":2176},{"href":2175},"/articles/video-metadata-and-exif",[2177],{"type":26,"value":1453},{"type":26,"value":2179},"で触れていますが、",{"type":21,"tag":34,"props":2181,"children":2182},{},[2183],{"type":26,"value":2184},"「撮影時の設定が後から確認できる」",{"type":26,"value":2186},"ことが、編集・カラーグレーディング段階での判断材料になります。",{"type":21,"tag":42,"props":2188,"children":2190},{"id":2189},"videotagger-なら動きの設定も横断できる",[2191],{"type":26,"value":2192},"VideoTagger なら「動きの設定」も横断できる",{"type":21,"tag":22,"props":2194,"children":2195},{},[2196,2198,2203,2205,2210],{"type":26,"value":2197},"VideoTagger はライブラリ内の各動画から、",{"type":21,"tag":34,"props":2199,"children":2200},{},[2201],{"type":26,"value":2202},"フレームレート・コーデック・解像度",{"type":26,"value":2204},"などの基本情報に加えて、可能な範囲で",{"type":21,"tag":34,"props":2206,"children":2207},{},[2208],{"type":26,"value":2209},"シャッター速度・撮影日時・カメラ機種",{"type":26,"value":2211},"といったメタデータも抽出します。",{"type":21,"tag":61,"props":2213,"children":2214},{},[2215,2220,2225],{"type":21,"tag":65,"props":2216,"children":2217},{},[2218],{"type":26,"value":2219},"「24fps で撮ったクリップだけを集めてシネマ風プロジェクトに使いたい」",{"type":21,"tag":65,"props":2221,"children":2222},{},[2223],{"type":26,"value":2224},"「同じイベントで撮った 60fps の素材だけ抜き出して、スロー編集の候補にしたい」",{"type":21,"tag":65,"props":2226,"children":2227},{},[2228],{"type":26,"value":2229},"「撮影時のシャッター設定がメタデータに残っている素材だけ確認したい」",{"type":21,"tag":22,"props":2231,"children":2232},{},[2233],{"type":26,"value":2234},"こうした絞り込みは、ファイル名やフォルダではなくメタデータベースで行うほうが圧倒的に速く・確実です。「動きのトーンを揃えたい」というクリエイティブな要件を、ライブラリ管理側でしっかり支える設計です。",{"type":21,"tag":42,"props":2236,"children":2237},{"id":427},[2238],{"type":26,"value":427},{"type":21,"tag":61,"props":2240,"children":2241},{},[2242,2247,2258,2263,2275,2280],{"type":21,"tag":65,"props":2243,"children":2244},{},[2245],{"type":26,"value":2246},"シャッター速度とシャッター角度は同じことを別単位で言ったもの",{"type":21,"tag":65,"props":2248,"children":2249},{},[2250,2252,2256],{"type":26,"value":2251},"動画の基本は ",{"type":21,"tag":34,"props":2253,"children":2254},{},[2255],{"type":26,"value":1356},{"type":26,"value":2257},"。フレームレートの倍を分母にしたシャッター速度",{"type":21,"tag":65,"props":2259,"children":2260},{},[2261],{"type":26,"value":2262},"角度を変えると動きの見え方が変わる。明るさ調整に使ってはいけない",{"type":21,"tag":65,"props":2264,"children":2265},{},[2266,2268,2273],{"type":26,"value":2267},"明るさは ",{"type":21,"tag":34,"props":2269,"children":2270},{},[2271],{"type":26,"value":2272},"ND フィルター",{"type":26,"value":2274}," で。シャッターはなるべく固定",{"type":21,"tag":65,"props":2276,"children":2277},{},[2278],{"type":26,"value":2279},"ハイフレームレート撮影でも 180° を維持するのが基本",{"type":21,"tag":65,"props":2281,"children":2282},{},[2283],{"type":26,"value":2284},"フリッカーが出る環境ではフレームレートか照明側で調整",{"type":21,"tag":22,"props":2286,"children":2287},{},[2288],{"type":26,"value":2289},"「シャッターは動きの設定」と覚えておけば、写真出身でも動画の現場で迷うことは大幅に減ります。",{"title":7,"searchDepth":455,"depth":455,"links":2291},[2292,2293,2294,2295,2300,2301,2302,2303,2304,2305],{"id":1615,"depth":455,"text":1615},{"id":1703,"depth":455,"text":1706},{"id":1745,"depth":455,"text":1748},{"id":1870,"depth":455,"text":1873,"children":2296},[2297,2299],{"id":1882,"depth":2298,"text":1885},3,{"id":1913,"depth":2298,"text":1916},{"id":1956,"depth":455,"text":1956},{"id":2013,"depth":455,"text":2013},{"id":2065,"depth":455,"text":2065},{"id":2137,"depth":455,"text":2137},{"id":2189,"depth":455,"text":2192},{"id":427,"depth":455,"text":427},"content:articles:ja:shutter-angle-explained.md","articles/ja/shutter-angle-explained.md","articles/ja/shutter-angle-explained",{"_path":2310,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":2311,"description":2312,"slug":2313,"date":1583,"category":12,"tags":2314,"body":2318,"_type":464,"_id":3095,"_source":466,"_file":3096,"_stem":3097,"_extension":469},"/articles/ja/video-metadata-and-exif","動画にも EXIF はある？ — MP4 / MOV に埋まっているメタデータの正体","写真の EXIF は当たり前のように見ているのに、動画のメタデータは見たことがない、という人は多いはずです。動画ファイルには EXIF そのものはありませんが、似た役割を果たすメタデータが確かに埋まっています。どこに、何が入っているのかを整理します。","video-metadata-and-exif",[14,2315,2316,2317],"metadata","exif","workflow",{"type":18,"children":2319,"toc":3085},[2320,2333,2345,2351,2363,2525,2537,2543,2548,2627,2639,2644,2649,2698,2714,2720,2731,2749,2769,2775,2787,2875,2902,2907,2927,2950,2955,2961,2973,2991,3003,3007,3080],{"type":21,"tag":22,"props":2321,"children":2322},{},[2323,2325,2331],{"type":26,"value":2324},"写真の ",{"type":21,"tag":518,"props":2326,"children":2328},{"className":2327},[],[2329],{"type":26,"value":2330},"JPEG",{"type":26,"value":2332}," を開けば、撮影日時・カメラ機種・レンズ・F 値・ISO まで、当たり前のように EXIF として表示されます。一方、動画ファイルを右クリックしてプロパティを開いても、「サイズ」「長さ」くらいしか出てこない。",{"type":21,"tag":22,"props":2334,"children":2335},{},[2336,2338,2343],{"type":26,"value":2337},"実は動画にも、写真とほとんど同じ情報が埋まっています。ただし呼び名と仕組みが違うだけです。この記事では、",{"type":21,"tag":34,"props":2339,"children":2340},{},[2341],{"type":26,"value":2342},"動画ファイルに実際に入っているメタデータ",{"type":26,"value":2344},"を、どこにどう入っているのか、何が読み出せるのかという視点で整理します。",{"type":21,"tag":42,"props":2346,"children":2348},{"id":2347},"結論から-動画にexifはないが相当物はある",[2349],{"type":26,"value":2350},"結論から — 動画に「EXIF」はないが、相当物はある",{"type":21,"tag":22,"props":2352,"children":2353},{},[2354,2356,2361],{"type":26,"value":2355},"まず用語の整理です。",{"type":21,"tag":34,"props":2357,"children":2358},{},[2359],{"type":26,"value":2360},"EXIF（Exchangeable Image File Format）は静止画用の規格",{"type":26,"value":2362},"で、厳密には MP4 や MOV の中にそのままの形では入っていません。動画には、EXIF の代わりに以下のような仕組みでメタデータが格納されています。",{"type":21,"tag":152,"props":2364,"children":2365},{},[2366,2387],{"type":21,"tag":156,"props":2367,"children":2368},{},[2369],{"type":21,"tag":160,"props":2370,"children":2371},{},[2372,2377,2382],{"type":21,"tag":164,"props":2373,"children":2374},{},[2375],{"type":26,"value":2376},"仕組み",{"type":21,"tag":164,"props":2378,"children":2379},{},[2380],{"type":26,"value":2381},"どこで使われるか",{"type":21,"tag":164,"props":2383,"children":2384},{},[2385],{"type":26,"value":2386},"中身の例",{"type":21,"tag":178,"props":2388,"children":2389},{},[2390,2427,2448,2469,2490],{"type":21,"tag":160,"props":2391,"children":2392},{},[2393,2417,2422],{"type":21,"tag":185,"props":2394,"children":2395},{},[2396],{"type":21,"tag":34,"props":2397,"children":2398},{},[2399,2401,2407,2409,2415],{"type":26,"value":2400},"ISO BMFF メタデータ（",{"type":21,"tag":518,"props":2402,"children":2404},{"className":2403},[],[2405],{"type":26,"value":2406},"udta",{"type":26,"value":2408}," / ",{"type":21,"tag":518,"props":2410,"children":2412},{"className":2411},[],[2413],{"type":26,"value":2414},"meta",{"type":26,"value":2416},"）",{"type":21,"tag":185,"props":2418,"children":2419},{},[2420],{"type":26,"value":2421},"MP4、MOV など",{"type":21,"tag":185,"props":2423,"children":2424},{},[2425],{"type":26,"value":2426},"カメラ機種、撮影日時、GPS、コメント",{"type":21,"tag":160,"props":2428,"children":2429},{},[2430,2438,2443],{"type":21,"tag":185,"props":2431,"children":2432},{},[2433],{"type":21,"tag":34,"props":2434,"children":2435},{},[2436],{"type":26,"value":2437},"QuickTime メタデータアトム",{"type":21,"tag":185,"props":2439,"children":2440},{},[2441],{"type":26,"value":2442},"MOV（QuickTime）",{"type":21,"tag":185,"props":2444,"children":2445},{},[2446],{"type":26,"value":2447},"著作権、機種、ソフトウェア、Apple 固有データ",{"type":21,"tag":160,"props":2449,"children":2450},{},[2451,2459,2464],{"type":21,"tag":185,"props":2452,"children":2453},{},[2454],{"type":21,"tag":34,"props":2455,"children":2456},{},[2457],{"type":26,"value":2458},"XMP（Adobe 由来）",{"type":21,"tag":185,"props":2460,"children":2461},{},[2462],{"type":26,"value":2463},"各種コンテナ",{"type":21,"tag":185,"props":2465,"children":2466},{},[2467],{"type":26,"value":2468},"レーティング、タグ、編集ソフト情報",{"type":21,"tag":160,"props":2470,"children":2471},{},[2472,2480,2485],{"type":21,"tag":185,"props":2473,"children":2474},{},[2475],{"type":21,"tag":34,"props":2476,"children":2477},{},[2478],{"type":26,"value":2479},"メーカー独自スキーマ",{"type":21,"tag":185,"props":2481,"children":2482},{},[2483],{"type":26,"value":2484},"Sony XAVC、Canon XF-AVC など",{"type":21,"tag":185,"props":2486,"children":2487},{},[2488],{"type":26,"value":2489},"撮影設定、レンズ情報、シーン情報",{"type":21,"tag":160,"props":2491,"children":2492},{},[2493,2501,2520],{"type":21,"tag":185,"props":2494,"children":2495},{},[2496],{"type":21,"tag":34,"props":2497,"children":2498},{},[2499],{"type":26,"value":2500},"サイドカーファイル",{"type":21,"tag":185,"props":2502,"children":2503},{},[2504,2506,2511,2513,2518],{"type":26,"value":2505},"Sony ",{"type":21,"tag":518,"props":2507,"children":2509},{"className":2508},[],[2510],{"type":26,"value":2157},{"type":26,"value":2512},"、ARRI ",{"type":21,"tag":518,"props":2514,"children":2516},{"className":2515},[],[2517],{"type":26,"value":2165},{"type":26,"value":2519}," など",{"type":21,"tag":185,"props":2521,"children":2522},{},[2523],{"type":26,"value":2524},"動画本体とは別ファイルにメタデータを格納",{"type":21,"tag":22,"props":2526,"children":2527},{},[2528,2530,2535],{"type":26,"value":2529},"EXIF というキーワードを「動画でも撮影情報を読み出したい」という意味で使うなら、答えは ",{"type":21,"tag":34,"props":2531,"children":2532},{},[2533],{"type":26,"value":2534},"「フォーマットは違うが、入っている」",{"type":26,"value":2536},"。中身のリッチさは、撮影機材しだいで写真より多い場合すらあります。",{"type":21,"tag":42,"props":2538,"children":2540},{"id":2539},"どこにどんな情報が入っているのか",[2541],{"type":26,"value":2542},"どこに、どんな情報が入っているのか",{"type":21,"tag":22,"props":2544,"children":2545},{},[2546],{"type":26,"value":2547},"具体的に何が読み出せるのか、よくある項目を並べます。",{"type":21,"tag":61,"props":2549,"children":2550},{},[2551,2561,2569,2579,2589,2597,2607,2617],{"type":21,"tag":65,"props":2552,"children":2553},{},[2554,2559],{"type":21,"tag":34,"props":2555,"children":2556},{},[2557],{"type":26,"value":2558},"撮影日時",{"type":26,"value":2560}," — ほぼ確実に入っています（タイムゾーン情報は機種依存）",{"type":21,"tag":65,"props":2562,"children":2563},{},[2564],{"type":21,"tag":34,"props":2565,"children":2566},{},[2567],{"type":26,"value":2568},"カメラのメーカー・機種・ソフトウェアバージョン",{"type":21,"tag":65,"props":2570,"children":2571},{},[2572,2577],{"type":21,"tag":34,"props":2573,"children":2574},{},[2575],{"type":26,"value":2576},"GPS 位置情報",{"type":26,"value":2578}," — スマホ・アクションカム・最近の一眼で記録されることが多い",{"type":21,"tag":65,"props":2580,"children":2581},{},[2582,2587],{"type":21,"tag":34,"props":2583,"children":2584},{},[2585],{"type":26,"value":2586},"解像度・フレームレート・コーデック・ビットレート",{"type":26,"value":2588}," — これは「メタデータ」というよりコンテナそのものから取れる情報",{"type":21,"tag":65,"props":2590,"children":2591},{},[2592],{"type":21,"tag":34,"props":2593,"children":2594},{},[2595],{"type":26,"value":2596},"色空間・カラーマトリクス・転送特性（Rec.709 / Rec.2020 / HLG / PQ など）",{"type":21,"tag":65,"props":2598,"children":2599},{},[2600,2605],{"type":21,"tag":34,"props":2601,"children":2602},{},[2603],{"type":26,"value":2604},"タイムコード（SMPTE）",{"type":26,"value":2606}," — 業務機ではほぼ必須",{"type":21,"tag":65,"props":2608,"children":2609},{},[2610,2615],{"type":21,"tag":34,"props":2611,"children":2612},{},[2613],{"type":26,"value":2614},"レンズ情報・絞り・シャッター速度・ISO 感度",{"type":26,"value":2616}," — メーカー独自領域に記録されることが多い",{"type":21,"tag":65,"props":2618,"children":2619},{},[2620,2625],{"type":21,"tag":34,"props":2621,"children":2622},{},[2623],{"type":26,"value":2624},"ホワイトバランス・ピクチャープロファイル",{"type":26,"value":2626}," — 同上",{"type":21,"tag":22,"props":2628,"children":2629},{},[2630,2632,2637],{"type":26,"value":2631},"「同上」と書いた領域が曲者で、メーカーごとに",{"type":21,"tag":34,"props":2633,"children":2634},{},[2635],{"type":26,"value":2636},"入っている／いない／場所が違う",{"type":26,"value":2638},"ものの最たる例です。Sony の業務機が書き出す XML には驚くほど詳細な情報が入っていますが、Canon の民生機の MP4 では同じ情報が抜けていることもあります。",{"type":21,"tag":42,"props":2640,"children":2642},{"id":2641},"どうやって中身を覗くか",[2643],{"type":26,"value":2641},{"type":21,"tag":22,"props":2645,"children":2646},{},[2647],{"type":26,"value":2648},"ファイル単体で確認したい場合、定番のツールがいくつかあります。",{"type":21,"tag":61,"props":2650,"children":2651},{},[2652,2665,2678,2688],{"type":21,"tag":65,"props":2653,"children":2654},{},[2655,2663],{"type":21,"tag":34,"props":2656,"children":2657},{},[2658],{"type":21,"tag":518,"props":2659,"children":2661},{"className":2660},[],[2662],{"type":26,"value":1415},{"type":26,"value":2664},"（FFmpeg 付属） — コンテナレベルの情報（解像度、フレームレート、コーデック、ビットレート、色空間）はこれで十分",{"type":21,"tag":65,"props":2666,"children":2667},{},[2668,2676],{"type":21,"tag":34,"props":2669,"children":2670},{},[2671],{"type":21,"tag":518,"props":2672,"children":2674},{"className":2673},[],[2675],{"type":26,"value":1422},{"type":26,"value":2677}," — 名前は EXIF ですが動画にも対応。メーカー独自のメタデータまでかなり読み出してくれる、事実上の決定版",{"type":21,"tag":65,"props":2679,"children":2680},{},[2681,2686],{"type":21,"tag":34,"props":2682,"children":2683},{},[2684],{"type":26,"value":2685},"macOS の「情報を見る」",{"type":26,"value":2687}," — QuickTime メタデータの一部が見える程度。本格的な確認には足りない",{"type":21,"tag":65,"props":2689,"children":2690},{},[2691,2696],{"type":21,"tag":34,"props":2692,"children":2693},{},[2694],{"type":26,"value":2695},"NLE のプロパティ画面",{"type":26,"value":2697},"（Premiere Pro、DaVinci Resolve など） — タイムコードや色空間など、編集に直接効くものは表示される",{"type":21,"tag":1965,"props":2699,"children":2700},{},[2701],{"type":21,"tag":22,"props":2702,"children":2703},{},[2704,2706,2712],{"type":26,"value":2705},"興味があれば、手元の動画一本に ",{"type":21,"tag":518,"props":2707,"children":2709},{"className":2708},[],[2710],{"type":26,"value":2711},"exiftool",{"type":26,"value":2713}," をかけてみてください。「撮ったときの設定がここまで残っていたのか」と驚くケースが多いはずです。",{"type":21,"tag":42,"props":2715,"children":2717},{"id":2716},"編集書き出しで消えるメタデータ",[2718],{"type":26,"value":2719},"編集・書き出しで「消える」メタデータ",{"type":21,"tag":22,"props":2721,"children":2722},{},[2723,2725,2730],{"type":26,"value":2724},"ここからが実務的に重要な話です。撮影時にどれだけ豊富なメタデータが入っていても、",{"type":21,"tag":34,"props":2726,"children":2727},{},[2728],{"type":26,"value":2729},"編集ソフトを通すと多くが落ちます",{"type":26,"value":550},{"type":21,"tag":61,"props":2732,"children":2733},{},[2734,2739,2744],{"type":21,"tag":65,"props":2735,"children":2736},{},[2737],{"type":26,"value":2738},"カメラ独自のメタデータは、編集ソフトのプロジェクトを経由する時点で大半が失われる",{"type":21,"tag":65,"props":2740,"children":2741},{},[2742],{"type":26,"value":2743},"書き出し時のコンテナ（MP4 / MOV / MKV）と、書き出しソフトの実装に依存する",{"type":21,"tag":65,"props":2745,"children":2746},{},[2747],{"type":26,"value":2748},"編集ソフトによっては GPS や撮影日時すら維持しない",{"type":21,"tag":22,"props":2750,"children":2751},{},[2752,2754,2759,2761,2767],{"type":26,"value":2753},"このため、",{"type":21,"tag":34,"props":2755,"children":2756},{},[2757],{"type":26,"value":2758},"「カメラ原本」と「書き出し済みファイル」では、メタデータの量がまるで違う",{"type":26,"value":2760},"のが普通です。原本を捨ててはいけない理由のひとつでもあります（",{"type":21,"tag":1085,"props":2762,"children":2764},{"href":2763},"/articles/video-codec-comparison",[2765],{"type":26,"value":2766},"コーデックの記事",{"type":26,"value":2768},"のアーカイブの章も合わせてどうぞ）。",{"type":21,"tag":42,"props":2770,"children":2772},{"id":2771},"サイドカーとxml-ale-csvの世界",[2773],{"type":26,"value":2774},"サイドカーと「.XML / .ALE / .CSV」の世界",{"type":21,"tag":22,"props":2776,"children":2777},{},[2778,2780,2785],{"type":26,"value":2779},"業務機の世界では、動画ファイル本体と",{"type":21,"tag":34,"props":2781,"children":2782},{},[2783],{"type":26,"value":2784},"別ファイル",{"type":26,"value":2786},"にメタデータを置く慣習が根強くあります。",{"type":21,"tag":61,"props":2788,"children":2789},{},[2790,2807,2830,2851],{"type":21,"tag":65,"props":2791,"children":2792},{},[2793,2798,2800,2805],{"type":21,"tag":34,"props":2794,"children":2795},{},[2796],{"type":26,"value":2797},"Sony",{"type":26,"value":2799}," — ",{"type":21,"tag":518,"props":2801,"children":2803},{"className":2802},[],[2804],{"type":26,"value":2157},{"type":26,"value":2806}," サイドカーで撮影情報・タイムコード・ピクチャープロファイルなどを保持",{"type":21,"tag":65,"props":2808,"children":2809},{},[2810,2815,2816,2822,2823,2828],{"type":21,"tag":34,"props":2811,"children":2812},{},[2813],{"type":26,"value":2814},"ARRI",{"type":26,"value":2799},{"type":21,"tag":518,"props":2817,"children":2819},{"className":2818},[],[2820],{"type":26,"value":2821},".ARI",{"type":26,"value":2408},{"type":21,"tag":518,"props":2824,"children":2826},{"className":2825},[],[2827],{"type":26,"value":2165},{"type":26,"value":2829},"、ALE は Avid 系編集との橋渡しに使う",{"type":21,"tag":65,"props":2831,"children":2832},{},[2833,2838,2839,2845,2846],{"type":21,"tag":34,"props":2834,"children":2835},{},[2836],{"type":26,"value":2837},"Canon",{"type":26,"value":2799},{"type":21,"tag":518,"props":2840,"children":2842},{"className":2841},[],[2843],{"type":26,"value":2844},".CPF",{"type":26,"value":2408},{"type":21,"tag":518,"props":2847,"children":2849},{"className":2848},[],[2850],{"type":26,"value":2157},{"type":21,"tag":65,"props":2852,"children":2853},{},[2854,2859,2860,2866,2867,2873],{"type":21,"tag":34,"props":2855,"children":2856},{},[2857],{"type":26,"value":2858},"ロケ現場のスクリプター",{"type":26,"value":2799},{"type":21,"tag":518,"props":2861,"children":2863},{"className":2862},[],[2864],{"type":26,"value":2865},".CSV",{"type":26,"value":1176},{"type":21,"tag":518,"props":2868,"children":2870},{"className":2869},[],[2871],{"type":26,"value":2872},".EDL",{"type":26,"value":2874}," でショットノートを別管理",{"type":21,"tag":22,"props":2876,"children":2877},{},[2878,2880,2885,2887,2893,2895,2900],{"type":26,"value":2879},"これらのサイドカーファイルは",{"type":21,"tag":34,"props":2881,"children":2882},{},[2883],{"type":26,"value":2884},"コピー時に置き去りにされやすい",{"type":26,"value":2886},"典型例です。",{"type":21,"tag":518,"props":2888,"children":2890},{"className":2889},[],[2891],{"type":26,"value":2892},"MP4",{"type":26,"value":2894}," だけ Finder で複製してしまい、隣にあった ",{"type":21,"tag":518,"props":2896,"children":2898},{"className":2897},[],[2899],{"type":26,"value":2157},{"type":26,"value":2901}," を取りこぼす、というのはよくある事故。フォルダごと、あるいはオリジナルのフォルダ階層を保ったままコピーするのが原則です。",{"type":21,"tag":42,"props":2903,"children":2905},{"id":2904},"スマートフォンの動画は意外と情報が多い",[2906],{"type":26,"value":2904},{"type":21,"tag":22,"props":2908,"children":2909},{},[2910,2912,2918,2919,2925],{"type":26,"value":2911},"iPhone や最近の Android で撮った ",{"type":21,"tag":518,"props":2913,"children":2915},{"className":2914},[],[2916],{"type":26,"value":2917},".MOV",{"type":26,"value":2408},{"type":21,"tag":518,"props":2920,"children":2922},{"className":2921},[],[2923],{"type":26,"value":2924},".MP4",{"type":26,"value":2926}," には、想像より多くのメタデータが入っています。",{"type":21,"tag":61,"props":2928,"children":2929},{},[2930,2935,2940,2945],{"type":21,"tag":65,"props":2931,"children":2932},{},[2933],{"type":26,"value":2934},"撮影日時・GPS・端末モデル",{"type":21,"tag":65,"props":2936,"children":2937},{},[2938],{"type":26,"value":2939},"縦横回転情報（再生ソフトはこれを見て自動回転している）",{"type":21,"tag":65,"props":2941,"children":2942},{},[2943],{"type":26,"value":2944},"Apple HEVC / HEIF のジャイロ・モーション情報（手ブレ補正の元データ）",{"type":21,"tag":65,"props":2946,"children":2947},{},[2948],{"type":26,"value":2949},"HDR フラグ（Dolby Vision の場合は別途メタデータトラック）",{"type":21,"tag":22,"props":2951,"children":2952},{},[2953],{"type":26,"value":2954},"「スマホで撮ったクリップ」と「業務カメラで撮ったクリップ」が同じライブラリに混ざっているなら、両者からどの情報が引き出せるか把握しておくと、後の検索効率がまったく変わります。",{"type":21,"tag":42,"props":2956,"children":2958},{"id":2957},"videotagger-はこの動画の-exifを読みに行く",[2959],{"type":26,"value":2960},"VideoTagger はこの「動画の EXIF」を読みに行く",{"type":21,"tag":22,"props":2962,"children":2963},{},[2964,2966,2971],{"type":26,"value":2965},"VideoTagger は、ライブラリに取り込んだ動画ファイルからメタデータを自動的に抽出します。コンテナレベルの情報（コーデック、解像度、フレームレート、ビットレート、色空間）だけでなく、",{"type":21,"tag":34,"props":2967,"children":2968},{},[2969],{"type":26,"value":2970},"撮影日時・カメラ機種・GPS・タイムコード",{"type":26,"value":2972},"など、ファイルに残っていれば極力読み取って、検索とフィルタの対象にします。",{"type":21,"tag":61,"props":2974,"children":2975},{},[2976,2981,2986],{"type":21,"tag":65,"props":2977,"children":2978},{},[2979],{"type":26,"value":2980},"「2024 年に Sony α7S III で撮ったクリップだけを集めたい」",{"type":21,"tag":65,"props":2982,"children":2983},{},[2984],{"type":26,"value":2985},"「GPS 情報がついている素材だけ抽出して、ロケ別に並べたい」",{"type":21,"tag":65,"props":2987,"children":2988},{},[2989],{"type":26,"value":2990},"「ProRes で 4K、Rec.2020 で記録されているマスター素材だけを横断したい」",{"type":21,"tag":22,"props":2992,"children":2993},{},[2994,2996,3001],{"type":26,"value":2995},"こうした検索を、フォルダ階層やファイル名に頼らず",{"type":21,"tag":34,"props":2997,"children":2998},{},[2999],{"type":26,"value":3000},"メタデータベースで一発で",{"type":26,"value":3002},"返せるのが、VideoTagger の設計思想です。動画にメタデータが入っていることを知らないまま運用していたチームほど、導入後の体感差が大きい部分です。",{"type":21,"tag":42,"props":3004,"children":3005},{"id":427},[3006],{"type":26,"value":427},{"type":21,"tag":61,"props":3008,"children":3009},{},[3010,3035,3040,3052,3064],{"type":21,"tag":65,"props":3011,"children":3012},{},[3013,3015,3020,3021,3026,3028,3033],{"type":26,"value":3014},"動画ファイルに「EXIF そのもの」はない。ただし MP4 の ",{"type":21,"tag":518,"props":3016,"children":3018},{"className":3017},[],[3019],{"type":26,"value":2406},{"type":26,"value":2408},{"type":21,"tag":518,"props":3022,"children":3024},{"className":3023},[],[3025],{"type":26,"value":2414},{"type":26,"value":3027},"、QuickTime メタデータ、XMP、メーカー独自スキーマで",{"type":21,"tag":34,"props":3029,"children":3030},{},[3031],{"type":26,"value":3032},"同等以上",{"type":26,"value":3034},"の情報が入っている",{"type":21,"tag":65,"props":3036,"children":3037},{},[3038],{"type":26,"value":3039},"撮影日時・GPS・カメラ機種・タイムコード・色空間など、写真の EXIF に劣らない情報量",{"type":21,"tag":65,"props":3041,"children":3042},{},[3043,3045,3050],{"type":26,"value":3044},"編集・書き出しを通すと多くが落ちる。",{"type":21,"tag":34,"props":3046,"children":3047},{},[3048],{"type":26,"value":3049},"原本を残す",{"type":26,"value":3051},"のが鉄則",{"type":21,"tag":65,"props":3053,"children":3054},{},[3055,3057,3062],{"type":26,"value":3056},"業務機はサイドカーファイル（",{"type":21,"tag":518,"props":3058,"children":3060},{"className":3059},[],[3061],{"type":26,"value":2157},{"type":26,"value":3063}," など）を別途出すので、フォルダごと保管する",{"type":21,"tag":65,"props":3065,"children":3066},{},[3067,3072,3073,3078],{"type":21,"tag":518,"props":3068,"children":3070},{"className":3069},[],[3071],{"type":26,"value":1422},{"type":26,"value":1176},{"type":21,"tag":518,"props":3074,"children":3076},{"className":3075},[],[3077],{"type":26,"value":1415},{"type":26,"value":3079}," で簡単に中身を覗ける",{"type":21,"tag":22,"props":3081,"children":3082},{},[3083],{"type":26,"value":3084},"「写真ほど騒がれないだけで、動画にもメタデータは確かに入っている」。これを前提に運用とアーカイブの設計を見直すと、ライブラリの価値が一段上がります。",{"title":7,"searchDepth":455,"depth":455,"links":3086},[3087,3088,3089,3090,3091,3092,3093,3094],{"id":2347,"depth":455,"text":2350},{"id":2539,"depth":455,"text":2542},{"id":2641,"depth":455,"text":2641},{"id":2716,"depth":455,"text":2719},{"id":2771,"depth":455,"text":2774},{"id":2904,"depth":455,"text":2904},{"id":2957,"depth":455,"text":2960},{"id":427,"depth":455,"text":427},"content:articles:ja:video-metadata-and-exif.md","articles/ja/video-metadata-and-exif.md","articles/ja/video-metadata-and-exif",{"_path":3099,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":3100,"description":3101,"slug":3102,"date":3103,"category":12,"tags":3104,"body":3108,"_type":464,"_id":3716,"_source":466,"_file":3717,"_stem":3718,"_extension":469},"/articles/ja/bit-depth-chroma-subsampling","10bit 4:2:2 はなぜ効くのか — ビット深度とクロマサブサンプリングの話","「10bit 4:2:2 で撮れ」とだけ言われて、何がどう変わるのか曖昧なまま使っていませんか。Log と相性が良い理由、8bit 4:2:0 で実際に何が起きるのか、用途別の現実的な選択基準までを整理します。","bit-depth-chroma-subsampling","2026-05-18",[14,3105,3106,3107],"bit-depth","chroma-subsampling","color",{"type":18,"children":3109,"toc":3708},[3110,3115,3127,3133,3145,3178,3197,3202,3208,3220,3225,3329,3340,3373,3378,3384,3389,3440,3452,3457,3462,3603,3615,3627,3632,3637,3649,3654,3658,3696],{"type":21,"tag":22,"props":3111,"children":3112},{},[3113],{"type":26,"value":3114},"カメラのスペック表に「10bit 4:2:2」「8bit 4:2:0」と並んでいて、なんとなく前者のほうがすごい、くらいの理解で済ませている方は多いと思います。",{"type":21,"tag":22,"props":3116,"children":3117},{},[3118,3120,3125],{"type":26,"value":3119},"この記事では、その 2 つの数字が",{"type":21,"tag":34,"props":3121,"children":3122},{},[3123],{"type":26,"value":3124},"実際に画質のどこに効いているのか",{"type":26,"value":3126},"、そしてどんな案件で意味を持つのかを整理します。",{"type":21,"tag":42,"props":3128,"children":3130},{"id":3129},"ビット深度-階調の刻み数",[3131],{"type":26,"value":3132},"ビット深度 — 階調の刻み数",{"type":21,"tag":22,"props":3134,"children":3135},{},[3136,3138,3143],{"type":26,"value":3137},"ビット深度は、明るさを",{"type":21,"tag":34,"props":3139,"children":3140},{},[3141],{"type":26,"value":3142},"何段階で記録するか",{"type":26,"value":3144},"を決める数字です。",{"type":21,"tag":61,"props":3146,"children":3147},{},[3148,3158,3168],{"type":21,"tag":65,"props":3149,"children":3150},{},[3151,3156],{"type":21,"tag":34,"props":3152,"children":3153},{},[3154],{"type":26,"value":3155},"8bit",{"type":26,"value":3157}," — 1 チャンネルあたり 256 段階 = 全色で約 1,677 万色",{"type":21,"tag":65,"props":3159,"children":3160},{},[3161,3166],{"type":21,"tag":34,"props":3162,"children":3163},{},[3164],{"type":26,"value":3165},"10bit",{"type":26,"value":3167}," — 1 チャンネルあたり 1,024 段階 = 全色で約 10 億色",{"type":21,"tag":65,"props":3169,"children":3170},{},[3171,3176],{"type":21,"tag":34,"props":3172,"children":3173},{},[3174],{"type":26,"value":3175},"12bit",{"type":26,"value":3177}," — 1 チャンネルあたり 4,096 段階 = 全色で約 687 億色",{"type":21,"tag":22,"props":3179,"children":3180},{},[3181,3183,3188,3190,3195],{"type":26,"value":3182},"数字だけ見ると 8bit でも十分に思えますが、問題は",{"type":21,"tag":34,"props":3184,"children":3185},{},[3186],{"type":26,"value":3187},"グレーディング後",{"type":26,"value":3189},"です。撮影後にコントラストや色を強く動かすと、刻みが粗いところが「縞模様（バンディング）」として目に見えてしまいます。空、肌、壁といった",{"type":21,"tag":34,"props":3191,"children":3192},{},[3193],{"type":26,"value":3194},"なだらかなグラデーション",{"type":26,"value":3196},"で特に顕在化します。",{"type":21,"tag":22,"props":3198,"children":3199},{},[3200],{"type":26,"value":3201},"10bit は 8bit の 4 倍細かいので、同じくらいの調整をしてもバンディングが出にくい。Log 撮影で 10bit が推奨されるのはこのためです。Log は撮影時にコントラストを潰して記録するため、再展開時に階調が引き伸ばされる前提です。元の刻みが粗いと、その引き伸ばしで一気に破綻します。",{"type":21,"tag":42,"props":3203,"children":3205},{"id":3204},"クロマサブサンプリング-色を間引いて記録する仕組み",[3206],{"type":26,"value":3207},"クロマサブサンプリング — 色を「間引いて」記録する仕組み",{"type":21,"tag":22,"props":3209,"children":3210},{},[3211,3213,3218],{"type":26,"value":3212},"人間の目は、明るさ（輝度）の変化には敏感ですが、色（色差）の変化にはそれほど敏感ではありません。動画の圧縮は、この性質を利用して",{"type":21,"tag":34,"props":3214,"children":3215},{},[3216],{"type":26,"value":3217},"色情報を間引く",{"type":26,"value":3219},"ことで、容量を節約してきました。",{"type":21,"tag":22,"props":3221,"children":3222},{},[3223],{"type":26,"value":3224},"「4:2:2」「4:2:0」というのは、その間引き方を表す比率です。",{"type":21,"tag":152,"props":3226,"children":3227},{},[3228,3251],{"type":21,"tag":156,"props":3229,"children":3230},{},[3231],{"type":21,"tag":160,"props":3232,"children":3233},{},[3234,3237,3242,3247],{"type":21,"tag":164,"props":3235,"children":3236},{},[],{"type":21,"tag":164,"props":3238,"children":3239},{},[3240],{"type":26,"value":3241},"輝度サンプル",{"type":21,"tag":164,"props":3243,"children":3244},{},[3245],{"type":26,"value":3246},"色差サンプル",{"type":21,"tag":164,"props":3248,"children":3249},{},[3250],{"type":26,"value":243},{"type":21,"tag":178,"props":3252,"children":3253},{},[3254,3279,3304],{"type":21,"tag":160,"props":3255,"children":3256},{},[3257,3265,3270,3274],{"type":21,"tag":185,"props":3258,"children":3259},{},[3260],{"type":21,"tag":34,"props":3261,"children":3262},{},[3263],{"type":26,"value":3264},"4:4:4",{"type":21,"tag":185,"props":3266,"children":3267},{},[3268],{"type":26,"value":3269},"フル",{"type":21,"tag":185,"props":3271,"children":3272},{},[3273],{"type":26,"value":3269},{"type":21,"tag":185,"props":3275,"children":3276},{},[3277],{"type":26,"value":3278},"映画用、合成・キー抜き",{"type":21,"tag":160,"props":3280,"children":3281},{},[3282,3290,3294,3299],{"type":21,"tag":185,"props":3283,"children":3284},{},[3285],{"type":21,"tag":34,"props":3286,"children":3287},{},[3288],{"type":26,"value":3289},"4:2:2",{"type":21,"tag":185,"props":3291,"children":3292},{},[3293],{"type":26,"value":3269},{"type":21,"tag":185,"props":3295,"children":3296},{},[3297],{"type":26,"value":3298},"横方向 1/2",{"type":21,"tag":185,"props":3300,"children":3301},{},[3302],{"type":26,"value":3303},"放送・編集向け中位",{"type":21,"tag":160,"props":3305,"children":3306},{},[3307,3315,3319,3324],{"type":21,"tag":185,"props":3308,"children":3309},{},[3310],{"type":21,"tag":34,"props":3311,"children":3312},{},[3313],{"type":26,"value":3314},"4:2:0",{"type":21,"tag":185,"props":3316,"children":3317},{},[3318],{"type":26,"value":3269},{"type":21,"tag":185,"props":3320,"children":3321},{},[3322],{"type":26,"value":3323},"横・縦ともに 1/2",{"type":21,"tag":185,"props":3325,"children":3326},{},[3327],{"type":26,"value":3328},"配信・撮影記録の主流",{"type":21,"tag":22,"props":3330,"children":3331},{},[3332,3334,3339],{"type":26,"value":3333},"ふつうに視聴するぶんには 4:2:0 でも気づきません。",{"type":21,"tag":34,"props":3335,"children":3336},{},[3337],{"type":26,"value":3338},"問題が出るのは編集中",{"type":26,"value":590},{"type":21,"tag":61,"props":3341,"children":3342},{},[3343,3353,3363],{"type":21,"tag":65,"props":3344,"children":3345},{},[3346,3351],{"type":21,"tag":34,"props":3347,"children":3348},{},[3349],{"type":26,"value":3350},"クロマキー合成（グリーンバック抜き）",{"type":26,"value":3352}," — 色情報が粗いと、エッジがガタつく",{"type":21,"tag":65,"props":3354,"children":3355},{},[3356,3361],{"type":21,"tag":34,"props":3357,"children":3358},{},[3359],{"type":26,"value":3360},"彩度を強く動かすカラーグレーディング",{"type":26,"value":3362}," — 色の境界がにじむ",{"type":21,"tag":65,"props":3364,"children":3365},{},[3366,3371],{"type":21,"tag":34,"props":3367,"children":3368},{},[3369],{"type":26,"value":3370},"タイトルや細い線の上に色が乗る場面",{"type":26,"value":3372}," — 色だけが「ずれる」ように見える",{"type":21,"tag":22,"props":3374,"children":3375},{},[3376],{"type":26,"value":3377},"4:2:2 は色情報を倍持っているので、こうした処理での余裕がはっきり違います。",{"type":21,"tag":42,"props":3379,"children":3381},{"id":3380},"_8bit-420-で起きるあるある",[3382],{"type":26,"value":3383},"8bit 4:2:0 で起きる「あるある」",{"type":21,"tag":22,"props":3385,"children":3386},{},[3387],{"type":26,"value":3388},"スマートフォンや多くの撮って出しカメラの記録は、デフォルトで 8bit 4:2:0 です。ふつうに撮ってふつうに編集するぶんには問題ありません。困るのは以下のような場面です。",{"type":21,"tag":61,"props":3390,"children":3391},{},[3392,3404,3416,3428],{"type":21,"tag":65,"props":3393,"children":3394},{},[3395,3397,3402],{"type":26,"value":3396},"空のグラデーションが、グレーディング後に",{"type":21,"tag":34,"props":3398,"children":3399},{},[3400],{"type":26,"value":3401},"輪っか状のバンディング",{"type":26,"value":3403},"になる",{"type":21,"tag":65,"props":3405,"children":3406},{},[3407,3409,3414],{"type":26,"value":3408},"グリーンバックを抜こうとしたら、エッジに",{"type":21,"tag":34,"props":3410,"children":3411},{},[3412],{"type":26,"value":3413},"色のジャギー",{"type":26,"value":3415},"が残る",{"type":21,"tag":65,"props":3417,"children":3418},{},[3419,3421,3426],{"type":26,"value":3420},"暗部を持ち上げたら、人物の頬に",{"type":21,"tag":34,"props":3422,"children":3423},{},[3424],{"type":26,"value":3425},"ノイズと色斑",{"type":26,"value":3427},"が出る",{"type":21,"tag":65,"props":3429,"children":3430},{},[3431,3433,3438],{"type":26,"value":3432},"細かい色差調整をしたら、肌の階調が",{"type":21,"tag":34,"props":3434,"children":3435},{},[3436],{"type":26,"value":3437},"ステップ状",{"type":26,"value":3439},"に見える",{"type":21,"tag":22,"props":3441,"children":3442},{},[3443,3445,3450],{"type":26,"value":3444},"つまり 8bit 4:2:0 は「",{"type":21,"tag":34,"props":3446,"children":3447},{},[3448],{"type":26,"value":3449},"撮って出しなら十分・後処理にはギリギリ",{"type":26,"value":3451},"」というラインです。動かす量が大きい仕事ほど、上の規格を選ぶ意味が出てきます。",{"type":21,"tag":42,"props":3453,"children":3455},{"id":3454},"用途別の現実的な選び方",[3456],{"type":26,"value":3454},{"type":21,"tag":22,"props":3458,"children":3459},{},[3460],{"type":26,"value":3461},"「常に最高スペックで撮れ」というのは現実的ではありません。容量・カメラ価格・転送時間との折り合いがあります。",{"type":21,"tag":152,"props":3463,"children":3464},{},[3465,3486],{"type":21,"tag":156,"props":3466,"children":3467},{},[3468],{"type":21,"tag":160,"props":3469,"children":3470},{},[3471,3476,3481],{"type":21,"tag":164,"props":3472,"children":3473},{},[3474],{"type":26,"value":3475},"案件",{"type":21,"tag":164,"props":3477,"children":3478},{},[3479],{"type":26,"value":3480},"推奨",{"type":21,"tag":164,"props":3482,"children":3483},{},[3484],{"type":26,"value":3485},"理由",{"type":21,"tag":178,"props":3487,"children":3488},{},[3489,3507,3525,3549,3567,3585],{"type":21,"tag":160,"props":3490,"children":3491},{},[3492,3497,3502],{"type":21,"tag":185,"props":3493,"children":3494},{},[3495],{"type":26,"value":3496},"YouTube の撮って出し",{"type":21,"tag":185,"props":3498,"children":3499},{},[3500],{"type":26,"value":3501},"8bit 4:2:0",{"type":21,"tag":185,"props":3503,"children":3504},{},[3505],{"type":26,"value":3506},"編集はカット中心、グレーディング軽め",{"type":21,"tag":160,"props":3508,"children":3509},{},[3510,3515,3520],{"type":21,"tag":185,"props":3511,"children":3512},{},[3513],{"type":26,"value":3514},"インタビュー（標準ガンマ）",{"type":21,"tag":185,"props":3516,"children":3517},{},[3518],{"type":26,"value":3519},"8bit 4:2:0 でも可 / 10bit が無難",{"type":21,"tag":185,"props":3521,"children":3522},{},[3523],{"type":26,"value":3524},"肌・暗部に多少触る",{"type":21,"tag":160,"props":3526,"children":3527},{},[3528,3536,3544],{"type":21,"tag":185,"props":3529,"children":3530},{},[3531],{"type":21,"tag":34,"props":3532,"children":3533},{},[3534],{"type":26,"value":3535},"Log 撮影",{"type":21,"tag":185,"props":3537,"children":3538},{},[3539],{"type":21,"tag":34,"props":3540,"children":3541},{},[3542],{"type":26,"value":3543},"10bit 4:2:2 以上",{"type":21,"tag":185,"props":3545,"children":3546},{},[3547],{"type":26,"value":3548},"階調の再展開が前提",{"type":21,"tag":160,"props":3550,"children":3551},{},[3552,3557,3562],{"type":21,"tag":185,"props":3553,"children":3554},{},[3555],{"type":26,"value":3556},"商品・料理・美術",{"type":21,"tag":185,"props":3558,"children":3559},{},[3560],{"type":26,"value":3561},"10bit 4:2:2",{"type":21,"tag":185,"props":3563,"children":3564},{},[3565],{"type":26,"value":3566},"色を追い込む案件",{"type":21,"tag":160,"props":3568,"children":3569},{},[3570,3575,3580],{"type":21,"tag":185,"props":3571,"children":3572},{},[3573],{"type":26,"value":3574},"合成・グリーンバック",{"type":21,"tag":185,"props":3576,"children":3577},{},[3578],{"type":26,"value":3579},"4:2:2 必須、可能なら 4:4:4",{"type":21,"tag":185,"props":3581,"children":3582},{},[3583],{"type":26,"value":3584},"エッジが命",{"type":21,"tag":160,"props":3586,"children":3587},{},[3588,3593,3598],{"type":21,"tag":185,"props":3589,"children":3590},{},[3591],{"type":26,"value":3592},"映画・放送納品",{"type":21,"tag":185,"props":3594,"children":3595},{},[3596],{"type":26,"value":3597},"10bit / 12bit 4:2:2 以上",{"type":21,"tag":185,"props":3599,"children":3600},{},[3601],{"type":26,"value":3602},"規格として要求される",{"type":21,"tag":22,"props":3604,"children":3605},{},[3606,3608,3613],{"type":26,"value":3607},"迷ったときの判断材料は",{"type":21,"tag":34,"props":3609,"children":3610},{},[3611],{"type":26,"value":3612},"「グレーディングでどれくらい動かすか」",{"type":26,"value":3614},"の一点に尽きます。動かさないなら 8bit 4:2:0 で十分、動かすなら 10bit 4:2:2、合成するなら 4:4:4 — というだけの話です。",{"type":21,"tag":22,"props":3616,"children":3617},{},[3618,3619,3625],{"type":26,"value":2172},{"type":21,"tag":1085,"props":3620,"children":3622},{"href":3621},"/articles/log-gamma-explained",[3623],{"type":26,"value":3624},"Log 撮影とは何か",{"type":26,"value":3626},"もどうぞ。",{"type":21,"tag":42,"props":3628,"children":3630},{"id":3629},"素材を残すときに",[3631],{"type":26,"value":3629},{"type":21,"tag":22,"props":3633,"children":3634},{},[3635],{"type":26,"value":3636},"10bit 4:2:2 で撮ったマスター素材は、当然ながらファイルが重くなります。プロジェクト終了後、配信用に書き出した 8bit 4:2:0 ファイルだけを残して、撮影マスターを捨ててしまう人をたまに見ます。",{"type":21,"tag":22,"props":3638,"children":3639},{},[3640,3642,3647],{"type":26,"value":3641},"これは数年後の自分にダメージを残す選択です。一度 8bit 4:2:0 に落とした素材から、元の階調を復元することはできません。「使い回せる素材」として残すなら、",{"type":21,"tag":34,"props":3643,"children":3644},{},[3645],{"type":26,"value":3646},"撮影時の規格のまま保管する",{"type":26,"value":3648},"のが基本です。",{"type":21,"tag":22,"props":3650,"children":3651},{},[3652],{"type":26,"value":3653},"VideoTagger のように撮影アーカイブを継続的に活用する前提のワークフローでは、容量の悩みは増えますが、その投資は素材を「再利用可能な状態」に保つためのコストとして十分に見合います。",{"type":21,"tag":42,"props":3655,"children":3656},{"id":427},[3657],{"type":26,"value":427},{"type":21,"tag":61,"props":3659,"children":3660},{},[3661,3671,3681,3691],{"type":21,"tag":65,"props":3662,"children":3663},{},[3664,3669],{"type":21,"tag":34,"props":3665,"children":3666},{},[3667],{"type":26,"value":3668},"ビット深度",{"type":26,"value":3670},"は階調の刻み数 — 後処理でグラデーションが破綻するかどうかを決める",{"type":21,"tag":65,"props":3672,"children":3673},{},[3674,3679],{"type":21,"tag":34,"props":3675,"children":3676},{},[3677],{"type":26,"value":3678},"クロマサブサンプリング",{"type":26,"value":3680},"は色の間引き方 — エッジと色調整の余裕を決める",{"type":21,"tag":65,"props":3682,"children":3683},{},[3684,3686],{"type":26,"value":3685},"撮って出しなら 8bit 4:2:0 で十分。",{"type":21,"tag":34,"props":3687,"children":3688},{},[3689],{"type":26,"value":3690},"動かすなら 10bit 4:2:2",{"type":21,"tag":65,"props":3692,"children":3693},{},[3694],{"type":26,"value":3695},"Log を使うなら 10bit 4:2:2 はほぼ前提と考えてよい",{"type":21,"tag":22,"props":3697,"children":3698},{},[3699,3701,3706],{"type":26,"value":3700},"スペック表の数字は、見るだけでなく",{"type":21,"tag":34,"props":3702,"children":3703},{},[3704],{"type":26,"value":3705},"何をしたいか",{"type":26,"value":3707},"から逆算して選ぶと迷いません。",{"title":7,"searchDepth":455,"depth":455,"links":3709},[3710,3711,3712,3713,3714,3715],{"id":3129,"depth":455,"text":3132},{"id":3204,"depth":455,"text":3207},{"id":3380,"depth":455,"text":3383},{"id":3454,"depth":455,"text":3454},{"id":3629,"depth":455,"text":3629},{"id":427,"depth":455,"text":427},"content:articles:ja:bit-depth-chroma-subsampling.md","articles/ja/bit-depth-chroma-subsampling.md","articles/ja/bit-depth-chroma-subsampling",{"_path":3720,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":3721,"description":3722,"slug":3723,"date":3103,"category":12,"tags":3724,"body":3726,"_type":464,"_id":4428,"_source":466,"_file":4429,"_stem":4430,"_extension":469},"/articles/ja/video-codec-comparison","動画コーデックの選び方 — H.264 / H.265 / ProRes / DNxHR の使い分け","「とりあえず H.264」で書き出し続けていませんか。配信向けと編集向けのコーデックは、設計思想からして別物です。主要コーデックの特徴と、撮影・編集・納品・アーカイブそれぞれの場面での選び方を整理します。","video-codec-comparison",[14,3725,16,2317],"codec",{"type":18,"children":3727,"toc":4415},[3728,3740,3745,3751,3756,3871,3876,3881,4090,4096,4102,4122,4126,4131,4165,4170,4175,4180,4213,4226,4231,4243,4261,4273,4279,4284,4317,4329,4335,4354,4358,4363,4403],{"type":21,"tag":22,"props":3729,"children":3730},{},[3731,3733,3738],{"type":26,"value":3732},"「コーデック」と「コンテナ（MP4・MOV など）」を一緒くたにしている人は意外と多いものです。コンテナはただの容器で、中に入っている",{"type":21,"tag":34,"props":3734,"children":3735},{},[3736],{"type":26,"value":3737},"コーデック",{"type":26,"value":3739},"こそが、画質・容量・編集のしやすさを決めています。",{"type":21,"tag":22,"props":3741,"children":3742},{},[3743],{"type":26,"value":3744},"この記事では、いま現場でよく使われる主要コーデックを横に並べ、撮影・編集・納品・アーカイブそれぞれで何を選ぶべきかを整理します。",{"type":21,"tag":42,"props":3746,"children":3748},{"id":3747},"コーデックには-2-つの系統がある",[3749],{"type":26,"value":3750},"コーデックには 2 つの系統がある",{"type":21,"tag":22,"props":3752,"children":3753},{},[3754],{"type":26,"value":3755},"すべてのコーデックは、ざっくり 2 つの目的のどちらかに最適化されています。",{"type":21,"tag":152,"props":3757,"children":3758},{},[3759,3778],{"type":21,"tag":156,"props":3760,"children":3761},{},[3762],{"type":21,"tag":160,"props":3763,"children":3764},{},[3765,3768,3773],{"type":21,"tag":164,"props":3766,"children":3767},{},[],{"type":21,"tag":164,"props":3769,"children":3770},{},[3771],{"type":26,"value":3772},"配信向き（Delivery）",{"type":21,"tag":164,"props":3774,"children":3775},{},[3776],{"type":26,"value":3777},"編集向き（Intermediate）",{"type":21,"tag":178,"props":3779,"children":3780},{},[3781,3799,3817,3835,3853],{"type":21,"tag":160,"props":3782,"children":3783},{},[3784,3789,3794],{"type":21,"tag":185,"props":3785,"children":3786},{},[3787],{"type":26,"value":3788},"目的",{"type":21,"tag":185,"props":3790,"children":3791},{},[3792],{"type":26,"value":3793},"容量を小さく",{"type":21,"tag":185,"props":3795,"children":3796},{},[3797],{"type":26,"value":3798},"編集での扱いやすさ",{"type":21,"tag":160,"props":3800,"children":3801},{},[3802,3807,3812],{"type":21,"tag":185,"props":3803,"children":3804},{},[3805],{"type":26,"value":3806},"圧縮方式",{"type":21,"tag":185,"props":3808,"children":3809},{},[3810],{"type":26,"value":3811},"時間方向に圧縮（Long-GOP）",{"type":21,"tag":185,"props":3813,"children":3814},{},[3815],{"type":26,"value":3816},"フレーム単位で圧縮（All-Intra）",{"type":21,"tag":160,"props":3818,"children":3819},{},[3820,3825,3830],{"type":21,"tag":185,"props":3821,"children":3822},{},[3823],{"type":26,"value":3824},"ファイルサイズ",{"type":21,"tag":185,"props":3826,"children":3827},{},[3828],{"type":26,"value":3829},"小さい",{"type":21,"tag":185,"props":3831,"children":3832},{},[3833],{"type":26,"value":3834},"大きい",{"type":21,"tag":160,"props":3836,"children":3837},{},[3838,3843,3848],{"type":21,"tag":185,"props":3839,"children":3840},{},[3841],{"type":26,"value":3842},"編集中の負荷",{"type":21,"tag":185,"props":3844,"children":3845},{},[3846],{"type":26,"value":3847},"重い",{"type":21,"tag":185,"props":3849,"children":3850},{},[3851],{"type":26,"value":3852},"軽い",{"type":21,"tag":160,"props":3854,"children":3855},{},[3856,3861,3866],{"type":21,"tag":185,"props":3857,"children":3858},{},[3859],{"type":26,"value":3860},"代表例",{"type":21,"tag":185,"props":3862,"children":3863},{},[3864],{"type":26,"value":3865},"H.264, H.265, AV1",{"type":21,"tag":185,"props":3867,"children":3868},{},[3869],{"type":26,"value":3870},"ProRes, DNxHR, Cineform",{"type":21,"tag":22,"props":3872,"children":3873},{},[3874],{"type":26,"value":3875},"この区別がコーデック選びの土台です。配信向きコーデックを編集ソフトに直接放り込んでも動きますが、再生がカクついたり、レンダリングが極端に遅くなったりするのはこの設計差のためです。",{"type":21,"tag":42,"props":3877,"children":3879},{"id":3878},"主要コーデック早見表",[3880],{"type":26,"value":3878},{"type":21,"tag":152,"props":3882,"children":3883},{},[3884,3909],{"type":21,"tag":156,"props":3885,"children":3886},{},[3887],{"type":21,"tag":160,"props":3888,"children":3889},{},[3890,3894,3899,3904],{"type":21,"tag":164,"props":3891,"children":3892},{},[3893],{"type":26,"value":3737},{"type":21,"tag":164,"props":3895,"children":3896},{},[3897],{"type":26,"value":3898},"系統",{"type":21,"tag":164,"props":3900,"children":3901},{},[3902],{"type":26,"value":3903},"強み",{"type":21,"tag":164,"props":3905,"children":3906},{},[3907],{"type":26,"value":3908},"弱み",{"type":21,"tag":178,"props":3910,"children":3911},{},[3912,3938,3963,3988,4014,4039,4064],{"type":21,"tag":160,"props":3913,"children":3914},{},[3915,3923,3928,3933],{"type":21,"tag":185,"props":3916,"children":3917},{},[3918],{"type":21,"tag":34,"props":3919,"children":3920},{},[3921],{"type":26,"value":3922},"H.264 (AVC)",{"type":21,"tag":185,"props":3924,"children":3925},{},[3926],{"type":26,"value":3927},"配信",{"type":21,"tag":185,"props":3929,"children":3930},{},[3931],{"type":26,"value":3932},"どこでも再生できる、最も普及",{"type":21,"tag":185,"props":3934,"children":3935},{},[3936],{"type":26,"value":3937},"高解像度・高ビットレートで効率が落ちる",{"type":21,"tag":160,"props":3939,"children":3940},{},[3941,3949,3953,3958],{"type":21,"tag":185,"props":3942,"children":3943},{},[3944],{"type":21,"tag":34,"props":3945,"children":3946},{},[3947],{"type":26,"value":3948},"H.265 (HEVC)",{"type":21,"tag":185,"props":3950,"children":3951},{},[3952],{"type":26,"value":3927},{"type":21,"tag":185,"props":3954,"children":3955},{},[3956],{"type":26,"value":3957},"H.264 比でほぼ半分の容量で同等画質",{"type":21,"tag":185,"props":3959,"children":3960},{},[3961],{"type":26,"value":3962},"古い環境で再生不可な場合あり、エンコードが重い",{"type":21,"tag":160,"props":3964,"children":3965},{},[3966,3974,3978,3983],{"type":21,"tag":185,"props":3967,"children":3968},{},[3969],{"type":21,"tag":34,"props":3970,"children":3971},{},[3972],{"type":26,"value":3973},"AV1",{"type":21,"tag":185,"props":3975,"children":3976},{},[3977],{"type":26,"value":3927},{"type":21,"tag":185,"props":3979,"children":3980},{},[3981],{"type":26,"value":3982},"H.265 よりさらに高効率、ロイヤリティフリー",{"type":21,"tag":185,"props":3984,"children":3985},{},[3986],{"type":26,"value":3987},"エンコードが非常に重い、対応環境が育ち途中",{"type":21,"tag":160,"props":3989,"children":3990},{},[3991,3999,4004,4009],{"type":21,"tag":185,"props":3992,"children":3993},{},[3994],{"type":21,"tag":34,"props":3995,"children":3996},{},[3997],{"type":26,"value":3998},"ProRes 422 / 422 HQ / 4444",{"type":21,"tag":185,"props":4000,"children":4001},{},[4002],{"type":26,"value":4003},"編集",{"type":21,"tag":185,"props":4005,"children":4006},{},[4007],{"type":26,"value":4008},"Mac / Win 両対応、業界標準",{"type":21,"tag":185,"props":4010,"children":4011},{},[4012],{"type":26,"value":4013},"ファイルが大きい",{"type":21,"tag":160,"props":4015,"children":4016},{},[4017,4025,4029,4034],{"type":21,"tag":185,"props":4018,"children":4019},{},[4020],{"type":21,"tag":34,"props":4021,"children":4022},{},[4023],{"type":26,"value":4024},"DNxHR / DNxHD",{"type":21,"tag":185,"props":4026,"children":4027},{},[4028],{"type":26,"value":4003},{"type":21,"tag":185,"props":4030,"children":4031},{},[4032],{"type":26,"value":4033},"Avid 由来、放送系で広く使われる",{"type":21,"tag":185,"props":4035,"children":4036},{},[4037],{"type":26,"value":4038},"エンコーダの選択肢がやや限定的",{"type":21,"tag":160,"props":4040,"children":4041},{},[4042,4050,4054,4059],{"type":21,"tag":185,"props":4043,"children":4044},{},[4045],{"type":21,"tag":34,"props":4046,"children":4047},{},[4048],{"type":26,"value":4049},"Cineform",{"type":21,"tag":185,"props":4051,"children":4052},{},[4053],{"type":26,"value":4003},{"type":21,"tag":185,"props":4055,"children":4056},{},[4057],{"type":26,"value":4058},"クロスプラットフォーム、軽量",{"type":21,"tag":185,"props":4060,"children":4061},{},[4062],{"type":26,"value":4063},"採用は限定的",{"type":21,"tag":160,"props":4065,"children":4066},{},[4067,4075,4080,4085],{"type":21,"tag":185,"props":4068,"children":4069},{},[4070],{"type":21,"tag":34,"props":4071,"children":4072},{},[4073],{"type":26,"value":4074},"XAVC (Sony)",{"type":21,"tag":185,"props":4076,"children":4077},{},[4078],{"type":26,"value":4079},"撮影記録",{"type":21,"tag":185,"props":4081,"children":4082},{},[4083],{"type":26,"value":4084},"高ビットレート・10bit 4:2:2 対応",{"type":21,"tag":185,"props":4086,"children":4087},{},[4088],{"type":26,"value":4089},"中身は H.264/H.265、編集はそれなりに重い",{"type":21,"tag":42,"props":4091,"children":4093},{"id":4092},"工程ごとの正解",[4094],{"type":26,"value":4095},"工程ごとの「正解」",{"type":21,"tag":1880,"props":4097,"children":4099},{"id":4098},"撮影カメラ内記録",[4100],{"type":26,"value":4101},"撮影（カメラ内記録）",{"type":21,"tag":22,"props":4103,"children":4104},{},[4105,4107,4112,4114,4120],{"type":26,"value":4106},"カメラが書き出してくれるものをそのまま受け入れるしかありません。ただし、機種によって複数のフォーマットを選べる場合は、",{"type":21,"tag":34,"props":4108,"children":4109},{},[4110],{"type":26,"value":4111},"ビット深度とクロマサブサンプリングが上の規格",{"type":26,"value":4113},"を選ぶのが原則です。詳しくは姉妹記事の",{"type":21,"tag":1085,"props":4115,"children":4117},{"href":4116},"/articles/bit-depth-chroma-subsampling",[4118],{"type":26,"value":4119},"10bit 4:2:2 はなぜ効くのか",{"type":26,"value":4121},"をどうぞ。",{"type":21,"tag":1880,"props":4123,"children":4124},{"id":4003},[4125],{"type":26,"value":4003},{"type":21,"tag":22,"props":4127,"children":4128},{},[4129],{"type":26,"value":4130},"コーデックの議論で一番悩むところです。選択肢は 3 つあります。",{"type":21,"tag":4132,"props":4133,"children":4134},"ol",{},[4135,4145,4155],{"type":21,"tag":65,"props":4136,"children":4137},{},[4138,4143],{"type":21,"tag":34,"props":4139,"children":4140},{},[4141],{"type":26,"value":4142},"カメラ原本のまま編集する",{"type":26,"value":4144}," — 容量は最小。マシンが速ければ問題なし。最近のミドルレンジ以上の PC なら H.264 / H.265 でもそこそこ走ります。",{"type":21,"tag":65,"props":4146,"children":4147},{},[4148,4153],{"type":21,"tag":34,"props":4149,"children":4150},{},[4151],{"type":26,"value":4152},"編集向けコーデックにトランスコードする",{"type":26,"value":4154}," — ProRes 422 や DNxHR HQ に変換してから編集。最も快適で安定。容量は数倍に膨らみます。",{"type":21,"tag":65,"props":4156,"children":4157},{},[4158,4163],{"type":21,"tag":34,"props":4159,"children":4160},{},[4161],{"type":26,"value":4162},"プロキシ編集する",{"type":26,"value":4164}," — オリジナルは残したまま、低解像度の代理ファイルで編集。容量は抑えつつ、最終書き出しは原本から行えるハイブリッド。長尺・大量素材の案件に向きます。",{"type":21,"tag":22,"props":4166,"children":4167},{},[4168],{"type":26,"value":4169},"「マシンが頑張れない」と感じたら 2 か 3 を検討する、というくらいの判断で十分です。",{"type":21,"tag":1880,"props":4171,"children":4173},{"id":4172},"納品",[4174],{"type":26,"value":4172},{"type":21,"tag":22,"props":4176,"children":4177},{},[4178],{"type":26,"value":4179},"納品先の指定が最優先です。指定がない場合のデフォルトはこのあたり：",{"type":21,"tag":61,"props":4181,"children":4182},{},[4183,4193,4203],{"type":21,"tag":65,"props":4184,"children":4185},{},[4186,4191],{"type":21,"tag":34,"props":4187,"children":4188},{},[4189],{"type":26,"value":4190},"Web / SNS / YouTube",{"type":26,"value":4192}," — H.264（1080p なら 8–12 Mbps、4K なら 35–50 Mbps）",{"type":21,"tag":65,"props":4194,"children":4195},{},[4196,4201],{"type":21,"tag":34,"props":4197,"children":4198},{},[4199],{"type":26,"value":4200},"放送・劇場",{"type":26,"value":4202}," — ProRes 422 HQ または DNxHR HQ",{"type":21,"tag":65,"props":4204,"children":4205},{},[4206,4211],{"type":21,"tag":34,"props":4207,"children":4208},{},[4209],{"type":26,"value":4210},"クライアントレビュー用",{"type":26,"value":4212}," — H.264 でファイルサイズ重視",{"type":21,"tag":22,"props":4214,"children":4215},{},[4216,4218,4224],{"type":26,"value":4217},"ビットレートの目安は",{"type":21,"tag":1085,"props":4219,"children":4221},{"href":4220},"/articles/video-bitrate-basics",[4222],{"type":26,"value":4223},"ビットレートの記事",{"type":26,"value":4225},"で詳しく触れています。",{"type":21,"tag":1880,"props":4227,"children":4229},{"id":4228},"アーカイブ",[4230],{"type":26,"value":4228},{"type":21,"tag":22,"props":4232,"children":4233},{},[4234,4236,4241],{"type":26,"value":4235},"長期保存はもう一つの軸です。",{"type":21,"tag":34,"props":4237,"children":4238},{},[4239],{"type":26,"value":4240},"「数年後にまた使いたい」",{"type":26,"value":4242},"素材は、撮影時の規格のまま残すのが基本です。",{"type":21,"tag":61,"props":4244,"children":4245},{},[4246,4251,4256],{"type":21,"tag":65,"props":4247,"children":4248},{},[4249],{"type":26,"value":4250},"カメラ原本は変換せずそのまま保管",{"type":21,"tag":65,"props":4252,"children":4253},{},[4254],{"type":26,"value":4255},"編集向けにトランスコードした中間ファイルは、プロジェクト終了とともに削除して構わない",{"type":21,"tag":65,"props":4257,"children":4258},{},[4259],{"type":26,"value":4260},"配信用に書き出した最終納品物だけを残すのは、再利用の選択肢を捨てる選択",{"type":21,"tag":22,"props":4262,"children":4263},{},[4264,4266,4271],{"type":26,"value":4265},"容量との折り合いがつかない場合は、",{"type":21,"tag":34,"props":4267,"children":4268},{},[4269],{"type":26,"value":4270},"外付け HDD + クラウドのコールドストレージ",{"type":26,"value":4272},"の組み合わせが現実的です。VideoTagger のように撮影アーカイブから素材を引き戻す前提のワークフローでは、原本を「検索可能な状態」で残しておくことが、後から効いてくる投資になります。",{"type":21,"tag":42,"props":4274,"children":4276},{"id":4275},"h265-にすればいいのではへの答え",[4277],{"type":26,"value":4278},"「H.265 にすればいいのでは？」への答え",{"type":21,"tag":22,"props":4280,"children":4281},{},[4282],{"type":26,"value":4283},"容量が H.264 の半分で同等画質なら、H.265 一択に思えます。実際そういう場面も多いのですが、注意点もあります。",{"type":21,"tag":61,"props":4285,"children":4286},{},[4287,4297,4307],{"type":21,"tag":65,"props":4288,"children":4289},{},[4290,4295],{"type":21,"tag":34,"props":4291,"children":4292},{},[4293],{"type":26,"value":4294},"エンコードがかなり重い",{"type":26,"value":4296}," — 同じビットレートでも書き出し時間が長くなる",{"type":21,"tag":65,"props":4298,"children":4299},{},[4300,4305],{"type":21,"tag":34,"props":4301,"children":4302},{},[4303],{"type":26,"value":4304},"再生互換性",{"type":26,"value":4306}," — 古い PC、古いブラウザ、一部の SNS では再生に難が出る",{"type":21,"tag":65,"props":4308,"children":4309},{},[4310,4315],{"type":21,"tag":34,"props":4311,"children":4312},{},[4313],{"type":26,"value":4314},"編集ソフトでの扱い",{"type":26,"value":4316}," — H.264 より重い。プロキシ運用がほぼ前提になる",{"type":21,"tag":22,"props":4318,"children":4319},{},[4320,4322,4327],{"type":26,"value":4321},"要するに、「",{"type":21,"tag":34,"props":4323,"children":4324},{},[4325],{"type":26,"value":4326},"届けたい相手の環境を含めて H.265 が成立するなら",{"type":26,"value":4328},"最良」というのが現実的なところです。社内・編集者間の共有なら問題ないが、不特定多数に配るならまだ H.264 が無難、という選び方になります。",{"type":21,"tag":42,"props":4330,"children":4332},{"id":4331},"videotagger-ではコーデック判別も自動",[4333],{"type":26,"value":4334},"VideoTagger ではコーデック判別も自動",{"type":21,"tag":22,"props":4336,"children":4337},{},[4338,4340,4345,4347,4352],{"type":26,"value":4339},"VideoTagger はライブラリの各動画を解析して、",{"type":21,"tag":34,"props":4341,"children":4342},{},[4343],{"type":26,"value":4344},"コーデック（H.264 / HEVC / ProRes など）・ビットレート・解像度・フレームレート",{"type":26,"value":4346},"を自動的に抽出します。「ファイル情報」パネルに表示されるほか、",{"type":21,"tag":34,"props":4348,"children":4349},{},[4350],{"type":26,"value":4351},"コーデックでの絞り込み",{"type":26,"value":4353},"にも対応しているので、「ProRes のマスターだけ集める」「H.265 の納品ファイルだけ抽出する」といった操作で、ライブラリ全体を瞬時に横断できます。撮影・編集・納品・アーカイブが複数のコーデックで混在しているライブラリほど、効果が大きい機能です。",{"type":21,"tag":42,"props":4355,"children":4356},{"id":427},[4357],{"type":26,"value":427},{"type":21,"tag":22,"props":4359,"children":4360},{},[4361],{"type":26,"value":4362},"コーデック選びの判断軸はシンプルです。",{"type":21,"tag":61,"props":4364,"children":4365},{},[4366,4376,4385,4394],{"type":21,"tag":65,"props":4367,"children":4368},{},[4369,4374],{"type":21,"tag":34,"props":4370,"children":4371},{},[4372],{"type":26,"value":4373},"撮影",{"type":26,"value":4375}," — カメラの最上位フォーマット（ビット深度 / クロマ重視）",{"type":21,"tag":65,"props":4377,"children":4378},{},[4379,4383],{"type":21,"tag":34,"props":4380,"children":4381},{},[4382],{"type":26,"value":4003},{"type":26,"value":4384}," — 重ければ ProRes / DNxHR にトランスコード、またはプロキシ",{"type":21,"tag":65,"props":4386,"children":4387},{},[4388,4392],{"type":21,"tag":34,"props":4389,"children":4390},{},[4391],{"type":26,"value":4172},{"type":26,"value":4393}," — 納品先の指定に従う。指定なしなら H.264 が無難",{"type":21,"tag":65,"props":4395,"children":4396},{},[4397,4401],{"type":21,"tag":34,"props":4398,"children":4399},{},[4400],{"type":26,"value":4228},{"type":26,"value":4402}," — カメラ原本を残す。配信書き出しだけを残してはいけない",{"type":21,"tag":22,"props":4404,"children":4405},{},[4406,4408,4413],{"type":26,"value":4407},"H.264 / H.265 / ProRes / DNxHR は競合ではなく、",{"type":21,"tag":34,"props":4409,"children":4410},{},[4411],{"type":26,"value":4412},"それぞれ役割の違う道具",{"type":26,"value":4414},"です。撮影から納品までの一連の工程で、複数を使い分けるのが普通だと考えてください。",{"title":7,"searchDepth":455,"depth":455,"links":4416},[4417,4418,4419,4425,4426,4427],{"id":3747,"depth":455,"text":3750},{"id":3878,"depth":455,"text":3878},{"id":4092,"depth":455,"text":4095,"children":4420},[4421,4422,4423,4424],{"id":4098,"depth":2298,"text":4101},{"id":4003,"depth":2298,"text":4003},{"id":4172,"depth":2298,"text":4172},{"id":4228,"depth":2298,"text":4228},{"id":4275,"depth":455,"text":4278},{"id":4331,"depth":455,"text":4334},{"id":427,"depth":455,"text":427},"content:articles:ja:video-codec-comparison.md","articles/ja/video-codec-comparison.md","articles/ja/video-codec-comparison",{"_path":4432,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":4433,"description":4434,"slug":4435,"date":11,"category":12,"tags":4436,"body":4439,"_type":464,"_id":4893,"_source":466,"_file":4894,"_stem":4895,"_extension":469},"/articles/ja/log-gamma-explained","Log 撮影とは何か — S-Log・V-Log・N-Log を「眠い映像」で終わらせないために","S-Log で撮ってみたら、ただ眠い映像になってしまった — というのは Log 入門者の定番です。Log がそもそも何のためにあるのか、なぜカラーグレーディングとセットで成立するのか、機材・案件別の「使うべき／使わないほうがいい場面」までを整理します。","log-gamma-explained",[14,4437,3107,4438],"log","sony-slog",{"type":18,"children":4440,"toc":4881},[4441,4446,4458,4464,4476,4488,4585,4597,4603,4608,4669,4674,4680,4685,4691,4703,4709,4721,4727,4732,4738,4812,4824,4829,4841,4853,4857,4869],{"type":21,"tag":22,"props":4442,"children":4443},{},[4444],{"type":26,"value":4445},"ソニーのカメラを買って S-Log3 を試したら、思っていたよりずっと眠い、ローコントラストの映像が出てきた — というのは、初めて Log に触れた人がほぼ全員通る道です。",{"type":21,"tag":22,"props":4447,"children":4448},{},[4449,4451,4456],{"type":26,"value":4450},"Log は「そのまま見るためのもの」ではなく、",{"type":21,"tag":34,"props":4452,"children":4453},{},[4454],{"type":26,"value":4455},"後で整える前提",{"type":26,"value":4457},"の撮り方です。この記事では、Log がそもそも何を狙った仕組みなのか、いつ使うべきで、いつ使うべきではないのかを整理します。",{"type":21,"tag":42,"props":4459,"children":4461},{"id":4460},"log-はダイナミックレンジを潰さないためのもの",[4462],{"type":26,"value":4463},"Log は「ダイナミックレンジを潰さないため」のもの",{"type":21,"tag":22,"props":4465,"children":4466},{},[4467,4469,4474],{"type":26,"value":4468},"ふつうのカメラ設定（Rec.709 / 標準ガンマ）は、撮影時にコントラストや彩度を強めに当てて、",{"type":21,"tag":34,"props":4470,"children":4471},{},[4472],{"type":26,"value":4473},"撮って出しで見栄えする絵",{"type":26,"value":4475},"を作ります。これは便利ですが、明部や暗部の情報が早い段階で「飽和」してしまうという代償があります。一度白飛び・黒つぶれした部分は、あとからどう触っても戻ってきません。",{"type":21,"tag":22,"props":4477,"children":4478},{},[4479,4481,4486],{"type":26,"value":4480},"Log ガンマは、この明暗の幅を",{"type":21,"tag":34,"props":4482,"children":4483},{},[4484],{"type":26,"value":4485},"できるだけ広く保ったまま記録",{"type":26,"value":4487},"するための曲線です。",{"type":21,"tag":152,"props":4489,"children":4490},{},[4491,4510],{"type":21,"tag":156,"props":4492,"children":4493},{},[4494],{"type":21,"tag":160,"props":4495,"children":4496},{},[4497,4500,4505],{"type":21,"tag":164,"props":4498,"children":4499},{},[],{"type":21,"tag":164,"props":4501,"children":4502},{},[4503],{"type":26,"value":4504},"標準ガンマ（Rec.709）",{"type":21,"tag":164,"props":4506,"children":4507},{},[4508],{"type":26,"value":4509},"Log（S-Log3 など）",{"type":21,"tag":178,"props":4511,"children":4512},{},[4513,4531,4549,4567],{"type":21,"tag":160,"props":4514,"children":4515},{},[4516,4521,4526],{"type":21,"tag":185,"props":4517,"children":4518},{},[4519],{"type":26,"value":4520},"ダイナミックレンジ",{"type":21,"tag":185,"props":4522,"children":4523},{},[4524],{"type":26,"value":4525},"約 6 段",{"type":21,"tag":185,"props":4527,"children":4528},{},[4529],{"type":26,"value":4530},"14 段前後",{"type":21,"tag":160,"props":4532,"children":4533},{},[4534,4539,4544],{"type":21,"tag":185,"props":4535,"children":4536},{},[4537],{"type":26,"value":4538},"見た目",{"type":21,"tag":185,"props":4540,"children":4541},{},[4542],{"type":26,"value":4543},"コントラスト・彩度あり",{"type":21,"tag":185,"props":4545,"children":4546},{},[4547],{"type":26,"value":4548},"フラット・眠い",{"type":21,"tag":160,"props":4550,"children":4551},{},[4552,4557,4562],{"type":21,"tag":185,"props":4553,"children":4554},{},[4555],{"type":26,"value":4556},"そのまま納品",{"type":21,"tag":185,"props":4558,"children":4559},{},[4560],{"type":26,"value":4561},"可",{"type":21,"tag":185,"props":4563,"children":4564},{},[4565],{"type":26,"value":4566},"不可（要グレーディング）",{"type":21,"tag":160,"props":4568,"children":4569},{},[4570,4575,4580],{"type":21,"tag":185,"props":4571,"children":4572},{},[4573],{"type":26,"value":4574},"ハイライト・シャドウ",{"type":21,"tag":185,"props":4576,"children":4577},{},[4578],{"type":26,"value":4579},"早めに飽和",{"type":21,"tag":185,"props":4581,"children":4582},{},[4583],{"type":26,"value":4584},"粘る",{"type":21,"tag":22,"props":4586,"children":4587},{},[4588,4590,4595],{"type":26,"value":4589},"「眠い映像」は失敗ではなく、",{"type":21,"tag":34,"props":4591,"children":4592},{},[4593],{"type":26,"value":4594},"仕様",{"type":26,"value":4596},"です。あとで自由に整えるための余白を残してくれている状態です。",{"type":21,"tag":42,"props":4598,"children":4600},{"id":4599},"メーカー別の主な-log-ガンマ",[4601],{"type":26,"value":4602},"メーカー別の主な Log ガンマ",{"type":21,"tag":22,"props":4604,"children":4605},{},[4606],{"type":26,"value":4607},"各社それぞれ独自の Log を持っています。基本的な発想は同じです。",{"type":21,"tag":61,"props":4609,"children":4610},{},[4611,4620,4630,4640,4649,4659],{"type":21,"tag":65,"props":4612,"children":4613},{},[4614,4618],{"type":21,"tag":34,"props":4615,"children":4616},{},[4617],{"type":26,"value":2797},{"type":26,"value":4619}," — S-Log2 / S-Log3。S-Log3 が現行の主流。組み合わせる色空間は S-Gamut3 / S-Gamut3.Cine。",{"type":21,"tag":65,"props":4621,"children":4622},{},[4623,4628],{"type":21,"tag":34,"props":4624,"children":4625},{},[4626],{"type":26,"value":4627},"Panasonic",{"type":26,"value":4629}," — V-Log / V-Log L。GH 系の L は機能制限版。",{"type":21,"tag":65,"props":4631,"children":4632},{},[4633,4638],{"type":21,"tag":34,"props":4634,"children":4635},{},[4636],{"type":26,"value":4637},"Nikon",{"type":26,"value":4639}," — N-Log。Z シリーズで採用。",{"type":21,"tag":65,"props":4641,"children":4642},{},[4643,4647],{"type":21,"tag":34,"props":4644,"children":4645},{},[4646],{"type":26,"value":2837},{"type":26,"value":4648}," — Canon Log / Log 2 / Log 3。Log 3 は扱いやすさ寄り。",{"type":21,"tag":65,"props":4650,"children":4651},{},[4652,4657],{"type":21,"tag":34,"props":4653,"children":4654},{},[4655],{"type":26,"value":4656},"FUJIFILM",{"type":26,"value":4658}," — F-Log / F-Log2。",{"type":21,"tag":65,"props":4660,"children":4661},{},[4662,4667],{"type":21,"tag":34,"props":4663,"children":4664},{},[4665],{"type":26,"value":4666},"DJI / Blackmagic",{"type":26,"value":4668}," — D-Log、BMD Film など。",{"type":21,"tag":22,"props":4670,"children":4671},{},[4672],{"type":26,"value":4673},"カメラごとに細かな違いはありますが、「広いダイナミックレンジ・フラットな見た目・グレーディング前提」という点は共通です。",{"type":21,"tag":42,"props":4675,"children":4677},{"id":4676},"log-とセットで考えるべき-3-つの要素",[4678],{"type":26,"value":4679},"Log とセットで考えるべき 3 つの要素",{"type":21,"tag":22,"props":4681,"children":4682},{},[4683],{"type":26,"value":4684},"Log だけ有効にしても、絵は良くなりません。むしろ単独だと劣化する場合があります。以下の 3 つは、Log を使う前にセットで確認しておく価値があります。",{"type":21,"tag":1880,"props":4686,"children":4688},{"id":4687},"_1-10bit-422-以上で記録できるか",[4689],{"type":26,"value":4690},"1. 10bit 4:2:2 以上で記録できるか",{"type":21,"tag":22,"props":4692,"children":4693},{},[4694,4696,4701],{"type":26,"value":4695},"Log は階調を圧縮して記録するため、再展開時に",{"type":21,"tag":34,"props":4697,"children":4698},{},[4699],{"type":26,"value":4700},"階調情報が薄い",{"type":26,"value":4702},"と、グレーディング中にバンディング（縞）が出ます。最低でも 10bit、できれば 4:2:2 が望ましい。8bit 4:2:0 の Log は撮ること自体はできますが、かなり繊細な扱いが必要になります。",{"type":21,"tag":1880,"props":4704,"children":4706},{"id":4705},"_2-露出はやや明るめが定石",[4707],{"type":26,"value":4708},"2. 露出は「やや明るめ」が定石",{"type":21,"tag":22,"props":4710,"children":4711},{},[4712,4714,4719],{"type":26,"value":4713},"Log は暗部にノイズが出やすい曲線です。露出計の指示通り、もしくは ",{"type":21,"tag":34,"props":4715,"children":4716},{},[4717],{"type":26,"value":4718},"+1 段ほどオーバー目",{"type":26,"value":4720},"で撮って、グレーディングで落とすほうがクリーンに仕上がります（いわゆる ETTR — Expose To The Right）。各社が「適正露出」と呼ぶ値より少し明るくする、と覚えておけば実用上は十分です。",{"type":21,"tag":1880,"props":4722,"children":4724},{"id":4723},"_3-グレーディングまで含めて運用できるか",[4725],{"type":26,"value":4726},"3. グレーディングまで含めて運用できるか",{"type":21,"tag":22,"props":4728,"children":4729},{},[4730],{"type":26,"value":4731},"撮影後に、最低限「LUT を当てて Rec.709 に戻す」「コントラストと彩度を整える」工程は必須です。これを毎回やる余裕がない案件なら、最初から標準ガンマ（あるいは HLG）のほうが幸せになれる場面も多いです。",{"type":21,"tag":42,"props":4733,"children":4735},{"id":4734},"log-を使うべき場面使わないほうがいい場面",[4736],{"type":26,"value":4737},"Log を使うべき場面・使わないほうがいい場面",{"type":21,"tag":152,"props":4739,"children":4740},{},[4741,4757],{"type":21,"tag":156,"props":4742,"children":4743},{},[4744],{"type":21,"tag":160,"props":4745,"children":4746},{},[4747,4752],{"type":21,"tag":164,"props":4748,"children":4749},{},[4750],{"type":26,"value":4751},"向いている",{"type":21,"tag":164,"props":4753,"children":4754},{},[4755],{"type":26,"value":4756},"向いていない",{"type":21,"tag":178,"props":4758,"children":4759},{},[4760,4773,4786,4799],{"type":21,"tag":160,"props":4761,"children":4762},{},[4763,4768],{"type":21,"tag":185,"props":4764,"children":4765},{},[4766],{"type":26,"value":4767},"明暗差が大きい屋外・逆光",{"type":21,"tag":185,"props":4769,"children":4770},{},[4771],{"type":26,"value":4772},"室内で照明が安定したインタビュー",{"type":21,"tag":160,"props":4774,"children":4775},{},[4776,4781],{"type":21,"tag":185,"props":4777,"children":4778},{},[4779],{"type":26,"value":4780},"仕上げに時間をかける案件",{"type":21,"tag":185,"props":4782,"children":4783},{},[4784],{"type":26,"value":4785},"撮って出しが必要なライブ・速報",{"type":21,"tag":160,"props":4787,"children":4788},{},[4789,4794],{"type":21,"tag":185,"props":4790,"children":4791},{},[4792],{"type":26,"value":4793},"後でカラーグレーディングする予定",{"type":21,"tag":185,"props":4795,"children":4796},{},[4797],{"type":26,"value":4798},"編集に時間を割けない量産案件",{"type":21,"tag":160,"props":4800,"children":4801},{},[4802,4807],{"type":21,"tag":185,"props":4803,"children":4804},{},[4805],{"type":26,"value":4806},"10bit 4:2:2 以上で撮れる機材",{"type":21,"tag":185,"props":4808,"children":4809},{},[4810],{"type":26,"value":4811},"8bit 4:2:0 しか出せない機材",{"type":21,"tag":22,"props":4813,"children":4814},{},[4815,4817,4822],{"type":26,"value":4816},"「Log = 上級者の証」ではありません。",{"type":21,"tag":34,"props":4818,"children":4819},{},[4820],{"type":26,"value":4821},"ワークフローが Log に追いついているかどうか",{"type":26,"value":4823},"だけが判断基準です。",{"type":21,"tag":42,"props":4825,"children":4827},{"id":4826},"素材整理にも効いてくる小さな副作用",[4828],{"type":26,"value":4826},{"type":21,"tag":22,"props":4830,"children":4831},{},[4832,4834,4839],{"type":26,"value":4833},"Log 素材には地味な悩みが一つあります。撮って出しではどれもフラットで似て見えるため、",{"type":21,"tag":34,"props":4835,"children":4836},{},[4837],{"type":26,"value":4838},"サムネイルだけでカットを判別しにくい",{"type":26,"value":4840},"のです。数か月後にアーカイブから「あのカット」を探そうとすると、これが意外と効いてきます。",{"type":21,"tag":22,"props":4842,"children":4843},{},[4844,4846,4851],{"type":26,"value":4845},"スレートの徹底、ファイル名の運用、あるいは VideoTagger のように撮影内容そのものをインデックス化するツール — いずれかの形で「",{"type":21,"tag":34,"props":4847,"children":4848},{},[4849],{"type":26,"value":4850},"Log 素材は中身で探す",{"type":26,"value":4852},"」という発想を最初から組み込んでおくと、後の自分が楽になります。",{"type":21,"tag":42,"props":4854,"children":4855},{"id":427},[4856],{"type":26,"value":427},{"type":21,"tag":22,"props":4858,"children":4859},{},[4860,4862,4867],{"type":26,"value":4861},"Log は「きれいに撮るためのモード」ではなく、「",{"type":21,"tag":34,"props":4863,"children":4864},{},[4865],{"type":26,"value":4866},"選択肢を残すためのモード",{"type":26,"value":4868},"」です。あとでどう仕上げたいかが見えているなら強力ですし、見えていないならただ手間が増えるだけです。",{"type":21,"tag":22,"props":4870,"children":4871},{},[4872,4874,4879],{"type":26,"value":4873},"迷ったら一度、",{"type":21,"tag":34,"props":4875,"children":4876},{},[4877],{"type":26,"value":4878},"同じシーンを Rec.709 と S-Log3 で並べて撮影し、両方を仕上げてみる",{"type":26,"value":4880},"のがいちばん早い理解の近道です。5 分のグレーディングが、どれだけ読んでも追いつかないほどの感覚を与えてくれます。",{"title":7,"searchDepth":455,"depth":455,"links":4882},[4883,4884,4885,4890,4891,4892],{"id":4460,"depth":455,"text":4463},{"id":4599,"depth":455,"text":4602},{"id":4676,"depth":455,"text":4679,"children":4886},[4887,4888,4889],{"id":4687,"depth":2298,"text":4690},{"id":4705,"depth":2298,"text":4708},{"id":4723,"depth":2298,"text":4726},{"id":4734,"depth":455,"text":4737},{"id":4826,"depth":455,"text":4826},{"id":427,"depth":455,"text":427},"content:articles:ja:log-gamma-explained.md","articles/ja/log-gamma-explained.md","articles/ja/log-gamma-explained",{"_path":4,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":8,"description":9,"slug":10,"date":11,"category":12,"tags":4897,"body":4898,"_type":464,"_id":465,"_source":466,"_file":467,"_stem":468,"_extension":469},[14,15,16],{"type":18,"children":4899,"toc":5233},[4900,4904,4913,4917,4926,4937,4941,4945,4954,4958,4978,4987,4991,4995,5078,5082,5086,5090,5133,5142,5146,5155,5185,5194,5198,5207,5211,5215,5224],{"type":21,"tag":22,"props":4901,"children":4902},{},[4903],{"type":26,"value":27},{"type":21,"tag":22,"props":4905,"children":4906},{},[4907,4908,4912],{"type":26,"value":32},{"type":21,"tag":34,"props":4909,"children":4910},{},[4911],{"type":26,"value":38},{"type":26,"value":40},{"type":21,"tag":42,"props":4914,"children":4915},{"id":44},[4916],{"type":26,"value":47},{"type":21,"tag":22,"props":4918,"children":4919},{},[4920,4921,4925],{"type":26,"value":52},{"type":21,"tag":34,"props":4922,"children":4923},{},[4924],{"type":26,"value":57},{"type":26,"value":59},{"type":21,"tag":61,"props":4927,"children":4928},{},[4929,4933],{"type":21,"tag":65,"props":4930,"children":4931},{},[4932],{"type":26,"value":69},{"type":21,"tag":65,"props":4934,"children":4935},{},[4936],{"type":26,"value":74},{"type":21,"tag":22,"props":4938,"children":4939},{},[4940],{"type":26,"value":79},{"type":21,"tag":42,"props":4942,"children":4943},{"id":82},[4944],{"type":26,"value":85},{"type":21,"tag":22,"props":4946,"children":4947},{},[4948,4949,4953],{"type":26,"value":90},{"type":21,"tag":34,"props":4950,"children":4951},{},[4952],{"type":26,"value":95},{"type":26,"value":97},{"type":21,"tag":22,"props":4955,"children":4956},{},[4957],{"type":26,"value":102},{"type":21,"tag":61,"props":4959,"children":4960},{},[4961,4974],{"type":21,"tag":65,"props":4962,"children":4963},{},[4964,4968,4969,4973],{"type":21,"tag":34,"props":4965,"children":4966},{},[4967],{"type":26,"value":113},{"type":26,"value":115},{"type":21,"tag":34,"props":4970,"children":4971},{},[4972],{"type":26,"value":120},{"type":26,"value":122},{"type":21,"tag":65,"props":4975,"children":4976},{},[4977],{"type":26,"value":127},{"type":21,"tag":22,"props":4979,"children":4980},{},[4981,4982,4986],{"type":26,"value":132},{"type":21,"tag":34,"props":4983,"children":4984},{},[4985],{"type":26,"value":137},{"type":26,"value":139},{"type":21,"tag":42,"props":4988,"children":4989},{"id":142},[4990],{"type":26,"value":145},{"type":21,"tag":22,"props":4992,"children":4993},{},[4994],{"type":26,"value":150},{"type":21,"tag":152,"props":4996,"children":4997},{},[4998,5015],{"type":21,"tag":156,"props":4999,"children":5000},{},[5001],{"type":21,"tag":160,"props":5002,"children":5003},{},[5004,5007,5011],{"type":21,"tag":164,"props":5005,"children":5006},{},[],{"type":21,"tag":164,"props":5008,"children":5009},{},[5010],{"type":26,"value":171},{"type":21,"tag":164,"props":5012,"children":5013},{},[5014],{"type":26,"value":176},{"type":21,"tag":178,"props":5016,"children":5017},{},[5018,5033,5048,5063],{"type":21,"tag":160,"props":5019,"children":5020},{},[5021,5025,5029],{"type":21,"tag":185,"props":5022,"children":5023},{},[5024],{"type":26,"value":189},{"type":21,"tag":185,"props":5026,"children":5027},{},[5028],{"type":26,"value":194},{"type":21,"tag":185,"props":5030,"children":5031},{},[5032],{"type":26,"value":199},{"type":21,"tag":160,"props":5034,"children":5035},{},[5036,5040,5044],{"type":21,"tag":185,"props":5037,"children":5038},{},[5039],{"type":26,"value":207},{"type":21,"tag":185,"props":5041,"children":5042},{},[5043],{"type":26,"value":212},{"type":21,"tag":185,"props":5045,"children":5046},{},[5047],{"type":26,"value":217},{"type":21,"tag":160,"props":5049,"children":5050},{},[5051,5055,5059],{"type":21,"tag":185,"props":5052,"children":5053},{},[5054],{"type":26,"value":225},{"type":21,"tag":185,"props":5056,"children":5057},{},[5058],{"type":26,"value":230},{"type":21,"tag":185,"props":5060,"children":5061},{},[5062],{"type":26,"value":235},{"type":21,"tag":160,"props":5064,"children":5065},{},[5066,5070,5074],{"type":21,"tag":185,"props":5067,"children":5068},{},[5069],{"type":26,"value":243},{"type":21,"tag":185,"props":5071,"children":5072},{},[5073],{"type":26,"value":248},{"type":21,"tag":185,"props":5075,"children":5076},{},[5077],{"type":26,"value":253},{"type":21,"tag":22,"props":5079,"children":5080},{},[5081],{"type":26,"value":258},{"type":21,"tag":42,"props":5083,"children":5084},{"id":261},[5085],{"type":26,"value":261},{"type":21,"tag":22,"props":5087,"children":5088},{},[5089],{"type":26,"value":268},{"type":21,"tag":61,"props":5091,"children":5092},{},[5093,5101,5109,5117,5125],{"type":21,"tag":65,"props":5094,"children":5095},{},[5096,5100],{"type":21,"tag":34,"props":5097,"children":5098},{},[5099],{"type":26,"value":279},{"type":26,"value":281},{"type":21,"tag":65,"props":5102,"children":5103},{},[5104,5108],{"type":21,"tag":34,"props":5105,"children":5106},{},[5107],{"type":26,"value":289},{"type":26,"value":291},{"type":21,"tag":65,"props":5110,"children":5111},{},[5112,5116],{"type":21,"tag":34,"props":5113,"children":5114},{},[5115],{"type":26,"value":299},{"type":26,"value":301},{"type":21,"tag":65,"props":5118,"children":5119},{},[5120,5124],{"type":21,"tag":34,"props":5121,"children":5122},{},[5123],{"type":26,"value":309},{"type":26,"value":311},{"type":21,"tag":65,"props":5126,"children":5127},{},[5128,5132],{"type":21,"tag":34,"props":5129,"children":5130},{},[5131],{"type":26,"value":319},{"type":26,"value":321},{"type":21,"tag":22,"props":5134,"children":5135},{},[5136,5137,5141],{"type":26,"value":326},{"type":21,"tag":34,"props":5138,"children":5139},{},[5140],{"type":26,"value":331},{"type":26,"value":333},{"type":21,"tag":42,"props":5143,"children":5144},{"id":336},[5145],{"type":26,"value":336},{"type":21,"tag":22,"props":5147,"children":5148},{},[5149,5150,5154],{"type":26,"value":343},{"type":21,"tag":34,"props":5151,"children":5152},{},[5153],{"type":26,"value":348},{"type":26,"value":350},{"type":21,"tag":61,"props":5156,"children":5157},{},[5158,5167,5176],{"type":21,"tag":65,"props":5159,"children":5160},{},[5161,5162,5166],{"type":26,"value":358},{"type":21,"tag":34,"props":5163,"children":5164},{},[5165],{"type":26,"value":363},{"type":26,"value":365},{"type":21,"tag":65,"props":5168,"children":5169},{},[5170,5171,5175],{"type":26,"value":370},{"type":21,"tag":34,"props":5172,"children":5173},{},[5174],{"type":26,"value":375},{"type":26,"value":377},{"type":21,"tag":65,"props":5177,"children":5178},{},[5179,5180,5184],{"type":26,"value":382},{"type":21,"tag":34,"props":5181,"children":5182},{},[5183],{"type":26,"value":387},{"type":26,"value":389},{"type":21,"tag":22,"props":5186,"children":5187},{},[5188,5189,5193],{"type":26,"value":394},{"type":21,"tag":34,"props":5190,"children":5191},{},[5192],{"type":26,"value":399},{"type":26,"value":401},{"type":21,"tag":42,"props":5195,"children":5196},{"id":404},[5197],{"type":26,"value":407},{"type":21,"tag":22,"props":5199,"children":5200},{},[5201,5202,5206],{"type":26,"value":412},{"type":21,"tag":34,"props":5203,"children":5204},{},[5205],{"type":26,"value":417},{"type":26,"value":419},{"type":21,"tag":22,"props":5208,"children":5209},{},[5210],{"type":26,"value":424},{"type":21,"tag":42,"props":5212,"children":5213},{"id":427},[5214],{"type":26,"value":427},{"type":21,"tag":22,"props":5216,"children":5217},{},[5218,5219,5223],{"type":26,"value":434},{"type":21,"tag":34,"props":5220,"children":5221},{},[5222],{"type":26,"value":439},{"type":26,"value":441},{"type":21,"tag":22,"props":5225,"children":5226},{},[5227,5228,5232],{"type":26,"value":446},{"type":21,"tag":34,"props":5229,"children":5230},{},[5231],{"type":26,"value":451},{"type":26,"value":453},{"title":7,"searchDepth":455,"depth":455,"links":5234},[5235,5236,5237,5238,5239,5240,5241],{"id":44,"depth":455,"text":47},{"id":82,"depth":455,"text":85},{"id":142,"depth":455,"text":145},{"id":261,"depth":455,"text":261},{"id":336,"depth":455,"text":336},{"id":404,"depth":455,"text":407},{"id":427,"depth":455,"text":427},{"_path":5243,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":5244,"description":5245,"slug":5246,"date":5247,"category":12,"tags":5248,"body":5251,"_type":464,"_id":5663,"_source":466,"_file":5664,"_stem":5665,"_extension":469},"/articles/ja/tag-vocabulary","自分の仕事に合ったタグ語彙のつくり方","AI のタグだけで仕事の 8 割は終わります。残りの 2 割 — あなたのプロジェクトを本当に検索可能にするのは、その上に積み上げる「自分の語彙」です。長持ちする語彙の育て方をご紹介します。","tag-vocabulary","2026-05-11",[2317,5249,5250],"tagging","tips",{"type":18,"children":5252,"toc":5653},[5253,5258,5270,5275,5281,5293,5298,5323,5335,5341,5346,5352,5357,5363,5375,5433,5438,5444,5449,5479,5484,5489,5494,5625,5631,5643,5648],{"type":21,"tag":22,"props":5254,"children":5255},{},[5256],{"type":26,"value":5257},"VideoTagger にクリップのフォルダを放り込むと、AI が重い処理を引き受けてくれます。人物・物体・シーン・行動を認識し、すべてのモーメントを自動でタグ付けします。多くのユーザーが「ここまで終わっているのか」と驚かれます。",{"type":21,"tag":22,"props":5259,"children":5260},{},[5261,5263,5268],{"type":26,"value":5262},"しかし AI はあなたのプロジェクトのことまでは知りません。「あの屋上のショット」が何度も使い回されている定番カットだということも、「いい B ロール」があなたのスタイルでは何を意味するのかも、知りません。その層 — ",{"type":21,"tag":34,"props":5264,"children":5265},{},[5266],{"type":26,"value":5267},"あなた自身の語彙",{"type":26,"value":5269}," — が、タグ付きライブラリを「使えるライブラリ」に変えます。",{"type":21,"tag":22,"props":5271,"children":5272},{},[5273],{"type":26,"value":5274},"この記事は、その語彙を考えすぎずに育てる方法についてです。",{"type":21,"tag":42,"props":5276,"children":5278},{"id":5277},"いま自分がどう検索しているかから始める",[5279],{"type":26,"value":5280},"「いま自分がどう検索しているか」から始める",{"type":21,"tag":22,"props":5282,"children":5283},{},[5284,5286,5291],{"type":26,"value":5285},"もっとも多い失敗は、最初にタグ分類を",{"type":21,"tag":34,"props":5287,"children":5288},{},[5289],{"type":26,"value":5290},"設計してしまう",{"type":26,"value":5292},"ことです。机に向かい、樹形図を書き、将来必要になりそうなものをすべて予測しようとする。これはほぼ確実に失敗します。使われないカテゴリで膨れ上がり、実際の検索が起きる場所がスカスカになります。",{"type":21,"tag":22,"props":5294,"children":5295},{},[5296],{"type":26,"value":5297},"逆をやってみてください。",{"type":21,"tag":4132,"props":5299,"children":5300},{},[5301,5313,5318],{"type":21,"tag":65,"props":5302,"children":5303},{},[5304,5306,5311],{"type":26,"value":5305},"1 週間、",{"type":21,"tag":34,"props":5307,"children":5308},{},[5309],{"type":26,"value":5310},"AI のタグだけ",{"type":26,"value":5312},"でライブラリを使ってみる",{"type":21,"tag":65,"props":5314,"children":5315},{},[5316],{"type":26,"value":5317},"「このタグがあったらな」と思った瞬間をすべてメモする。実際に口に出した言葉をそのまま書く",{"type":21,"tag":65,"props":5319,"children":5320},{},[5321],{"type":26,"value":5322},"1 週間後、そのメモにあった言葉をカスタムタグとして追加する。それがあなたの実際の語彙です",{"type":21,"tag":22,"props":5324,"children":5325},{},[5326,5328,5333],{"type":26,"value":5327},"このやり方で出てくる語彙は短く、具体的で、",{"type":21,"tag":34,"props":5329,"children":5330},{},[5331],{"type":26,"value":5332},"あなたが素材をどう捉えているか",{"type":26,"value":5334},"にしか合わないものになります。それでよいのです。",{"type":21,"tag":42,"props":5336,"children":5338},{"id":5337},"うまく機能しがちな-3-つの層",[5339],{"type":26,"value":5340},"うまく機能しがちな 3 つの層",{"type":21,"tag":22,"props":5342,"children":5343},{},[5344],{"type":26,"value":5345},"ワークフロー事例を見ていると、有用なタグ語彙はだいたい 3 つの層に整理できます。最初から 3 つすべてを揃える必要はありません。必要に応じて足していけば十分です。",{"type":21,"tag":1880,"props":5347,"children":5349},{"id":5348},"第-1-層-コンテンツ何が写っているか",[5350],{"type":26,"value":5351},"第 1 層 — コンテンツ（何が写っているか）",{"type":21,"tag":22,"props":5353,"children":5354},{},[5355],{"type":26,"value":5356},"AI がすでに無料でやってくれる層です。人物・物体・場所・動作。ここに手動で追加することはあまりありません。あるとすれば、AI が一般名で扱った特定の人物に名前を付けたり、カメラ越しに似て見える 2 つの場所を区別したい場合などです。",{"type":21,"tag":1880,"props":5358,"children":5360},{"id":5359},"第-2-層-品質意図このショットをどう使うか",[5361],{"type":26,"value":5362},"第 2 層 — 品質・意図（このショットをどう使うか）",{"type":21,"tag":22,"props":5364,"children":5365},{},[5366,5368,5373],{"type":26,"value":5367},"AI には埋められない層であり、",{"type":21,"tag":34,"props":5369,"children":5370},{},[5371],{"type":26,"value":5372},"カスタムタグの価値がもっとも高い",{"type":26,"value":5374},"層です。例えば：",{"type":21,"tag":61,"props":5376,"children":5377},{},[5378,5389,5400,5411,5422],{"type":21,"tag":65,"props":5379,"children":5380},{},[5381,5387],{"type":21,"tag":518,"props":5382,"children":5384},{"className":5383},[],[5385],{"type":26,"value":5386},"hero",{"type":26,"value":5388}," — シーケンスの軸にできるショット",{"type":21,"tag":65,"props":5390,"children":5391},{},[5392,5398],{"type":21,"tag":518,"props":5393,"children":5395},{"className":5394},[],[5396],{"type":26,"value":5397},"b-roll",{"type":26,"value":5399}," — 使える挿入素材",{"type":21,"tag":65,"props":5401,"children":5402},{},[5403,5409],{"type":21,"tag":518,"props":5404,"children":5406},{"className":5405},[],[5407],{"type":26,"value":5408},"cutaway-safe",{"type":26,"value":5410}," — 文脈なしでカットアウェイに差し込めるショット",{"type":21,"tag":65,"props":5412,"children":5413},{},[5414,5420],{"type":21,"tag":518,"props":5415,"children":5417},{"className":5416},[],[5418],{"type":26,"value":5419},"audio-clean",{"type":26,"value":5421}," — 音声としても使えるテイク（絵だけではなく）",{"type":21,"tag":65,"props":5423,"children":5424},{},[5425,5431],{"type":21,"tag":518,"props":5426,"children":5428},{"className":5427},[],[5429],{"type":26,"value":5430},"reject",{"type":26,"value":5432}," — 不採用テイク。使わない",{"type":21,"tag":22,"props":5434,"children":5435},{},[5436],{"type":26,"value":5437},"これは主観的な分類です。それが狙いです — あなたにしか分からない判断であり、検索を本当に強力にするのはまさにこの層です。",{"type":21,"tag":42,"props":5439,"children":5441},{"id":5440},"第-3-層-プロジェクト納品物このショットがどこへ向かうか",[5442],{"type":26,"value":5443},"第 3 層 — プロジェクト・納品物（このショットがどこへ向かうか）",{"type":21,"tag":22,"props":5445,"children":5446},{},[5447],{"type":26,"value":5448},"もっとも消費期限の短い層です。例：",{"type":21,"tag":61,"props":5450,"children":5451},{},[5452,5461,5470],{"type":21,"tag":65,"props":5453,"children":5454},{},[5455],{"type":21,"tag":518,"props":5456,"children":5458},{"className":5457},[],[5459],{"type":26,"value":5460},"proj-acme-launch",{"type":21,"tag":65,"props":5462,"children":5463},{},[5464],{"type":21,"tag":518,"props":5465,"children":5467},{"className":5466},[],[5468],{"type":26,"value":5469},"q3-newsletter",{"type":21,"tag":65,"props":5471,"children":5472},{},[5473],{"type":21,"tag":518,"props":5474,"children":5476},{"className":5475},[],[5477],{"type":26,"value":5478},"client-review-2026-05",{"type":21,"tag":22,"props":5480,"children":5481},{},[5482],{"type":26,"value":5483},"寿命は短いですが、確実に時間を節約してくれます。プロジェクトを納品したら、履歴として残すか、削除するか — お好みで。",{"type":21,"tag":42,"props":5485,"children":5487},{"id":5486},"半年後に効いてくる小さなルール",[5488],{"type":26,"value":5486},{"type":21,"tag":22,"props":5490,"children":5491},{},[5492],{"type":26,"value":5493},"数か月後にじわじわ効いてくる、地味だが重要な習慣をいくつか。",{"type":21,"tag":61,"props":5495,"children":5496},{},[5497,5522,5554,5578,5615],{"type":21,"tag":65,"props":5498,"children":5499},{},[5500,5505,5506,5512,5514,5520],{"type":21,"tag":34,"props":5501,"children":5502},{},[5503],{"type":26,"value":5504},"小文字＋ハイフン区切り",{"type":26,"value":550},{"type":21,"tag":518,"props":5507,"children":5509},{"className":5508},[],[5510],{"type":26,"value":5511},"Hero Shot",{"type":26,"value":5513}," ではなく ",{"type":21,"tag":518,"props":5515,"children":5517},{"className":5516},[],[5518],{"type":26,"value":5519},"hero-shot",{"type":26,"value":5521},"。スタイルが混ざったタグは、数百件溜まったあとでは整理が困難になります。",{"type":21,"tag":65,"props":5523,"children":5524},{},[5525,5530,5531,5537,5539,5545,5546,5552],{"type":21,"tag":34,"props":5526,"children":5527},{},[5528],{"type":26,"value":5529},"1 タグ 1 概念",{"type":26,"value":550},{"type":21,"tag":518,"props":5532,"children":5534},{"className":5533},[],[5535],{"type":26,"value":5536},"outdoor-interview",{"type":26,"value":5538}," ではなく、",{"type":21,"tag":518,"props":5540,"children":5542},{"className":5541},[],[5543],{"type":26,"value":5544},"interview",{"type":26,"value":115},{"type":21,"tag":518,"props":5547,"children":5549},{"className":5548},[],[5550],{"type":26,"value":5551},"outdoor",{"type":26,"value":5553}," を別タグに。組み合わせのほうが柔軟です。",{"type":21,"tag":65,"props":5555,"children":5556},{},[5557,5562,5563,5569,5570,5576],{"type":21,"tag":34,"props":5558,"children":5559},{},[5560],{"type":26,"value":5561},"プロジェクトタグには接頭辞",{"type":26,"value":550},{"type":21,"tag":518,"props":5564,"children":5566},{"className":5565},[],[5567],{"type":26,"value":5568},"proj-",{"type":26,"value":1176},{"type":21,"tag":518,"props":5571,"children":5573},{"className":5572},[],[5574],{"type":26,"value":5575},"client-",{"type":26,"value":5577}," をつけておくと、視覚的にまとまり、引退させやすくなります。",{"type":21,"tag":65,"props":5579,"children":5580},{},[5581,5586,5587,5592,5593,5599,5600,5606,5608,5613],{"type":21,"tag":34,"props":5582,"children":5583},{},[5584],{"type":26,"value":5585},"同義語をつくらない",{"type":26,"value":550},{"type":21,"tag":518,"props":5588,"children":5590},{"className":5589},[],[5591],{"type":26,"value":5386},{"type":26,"value":2408},{"type":21,"tag":518,"props":5594,"children":5596},{"className":5595},[],[5597],{"type":26,"value":5598},"pick",{"type":26,"value":2408},{"type":21,"tag":518,"props":5601,"children":5603},{"className":5602},[],[5604],{"type":26,"value":5605},"selects",{"type":26,"value":5607}," のどれかひとつに決めて、ぶれずに使う。AI のタグは増えるのが仕事ですが、",{"type":21,"tag":34,"props":5609,"children":5610},{},[5611],{"type":26,"value":5612},"自分のタグ",{"type":26,"value":5614},"はそうではありません。",{"type":21,"tag":65,"props":5616,"children":5617},{},[5618,5623],{"type":21,"tag":34,"props":5619,"children":5620},{},[5621],{"type":26,"value":5622},"四半期に 1 回だけ整理する",{"type":26,"value":5624},"。3 か月ごとに 5 分、終わったプロジェクトタグを掃除する。これだけで表面はずっと整います。",{"type":21,"tag":42,"props":5626,"children":5628},{"id":5627},"完成した語彙とはどのくらいの規模か",[5629],{"type":26,"value":5630},"「完成」した語彙とはどのくらいの規模か",{"type":21,"tag":22,"props":5632,"children":5633},{},[5634,5636,5641],{"type":26,"value":5635},"成熟したタグ語彙は、想像より小さいものです。AI のコンテンツタグに加えて、カスタムタグはだいたい ",{"type":21,"tag":34,"props":5637,"children":5638},{},[5639],{"type":26,"value":5640},"20〜50 個程度",{"type":26,"value":5642},"。最初の 1 か月を過ぎても毎週新しいタグを足し続けているなら、おそらく細かく作りすぎです。逆に、検索結果に関係のないクリップがまだ並ぶなら、まだ粗すぎます。",{"type":21,"tag":22,"props":5644,"children":5645},{},[5646],{"type":26,"value":5647},"目指したい状態のサインはこうです — 「以前は数分かかった検索が数秒で済むようになり、上位 3 件にほぼ目的のショットが入っている」。",{"type":21,"tag":22,"props":5649,"children":5650},{},[5651],{"type":26,"value":5652},"ここに到達したとき、ライブラリは「タグ付きファイルの山」から「実用ツール」に変わっています。",{"title":7,"searchDepth":455,"depth":455,"links":5654},[5655,5656,5660,5661,5662],{"id":5277,"depth":455,"text":5280},{"id":5337,"depth":455,"text":5340,"children":5657},[5658,5659],{"id":5348,"depth":2298,"text":5351},{"id":5359,"depth":2298,"text":5362},{"id":5440,"depth":455,"text":5443},{"id":5486,"depth":455,"text":5486},{"id":5627,"depth":455,"text":5630},"content:articles:ja:tag-vocabulary.md","articles/ja/tag-vocabulary.md","articles/ja/tag-vocabulary",{"_path":5667,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":5668,"description":5669,"slug":5670,"date":5671,"category":12,"tags":5672,"body":5675,"_type":464,"_id":5990,"_source":466,"_file":5991,"_stem":5992,"_extension":469},"/articles/ja/on-device-ai","VideoTagger がすべてをデバイス上で処理する理由","AI 動画ツールの多くは、あなたの素材を誰かのサーバーに送ります。VideoTagger は違います。「オンデバイス AI」が、プライバシー・処理速度・月々のコストに対して何を意味するのかを解説します。","on-device-ai","2026-05-08",[5673,5670,5674],"privacy","performance",{"type":18,"children":5676,"toc":5979},[5677,5682,5687,5693,5712,5809,5814,5820,5826,5831,5854,5859,5865,5877,5882,5888,5893,5898,5904,5909,5942,5947,5952,5965,5969,5974],{"type":21,"tag":22,"props":5678,"children":5679},{},[5680],{"type":26,"value":5681},"VideoTagger が AI を使っていると聞いて、最初に返ってくる質問はほぼ決まっています。「では、素材はどこかにアップロードされるのですか？」",{"type":21,"tag":22,"props":5683,"children":5684},{},[5685],{"type":26,"value":5686},"答えは「いいえ」です。素材はあなたのマシンから出ません。この記事では、なぜそのように設計したのか、そしてそれが実際に何をもたらすのかをご紹介します。",{"type":21,"tag":42,"props":5688,"children":5690},{"id":5689},"オンデバイスとは具体的にどういうことか",[5691],{"type":26,"value":5692},"「オンデバイス」とは具体的にどういうことか",{"type":21,"tag":22,"props":5694,"children":5695},{},[5696,5698,5703,5705,5710],{"type":26,"value":5697},"「AI を",{"type":21,"tag":34,"props":5699,"children":5700},{},[5701],{"type":26,"value":5702},"使う",{"type":26,"value":5704},"ツール」と「あなたのデータを",{"type":21,"tag":34,"props":5706,"children":5707},{},[5708],{"type":26,"value":5709},"クラウド AI に渡す",{"type":26,"value":5711},"ツール」の間には、本質的な違いがあります。",{"type":21,"tag":152,"props":5713,"children":5714},{},[5715,5734],{"type":21,"tag":156,"props":5716,"children":5717},{},[5718],{"type":21,"tag":160,"props":5719,"children":5720},{},[5721,5724,5729],{"type":21,"tag":164,"props":5722,"children":5723},{},[],{"type":21,"tag":164,"props":5725,"children":5726},{},[5727],{"type":26,"value":5728},"クラウド型 AI ツール",{"type":21,"tag":164,"props":5730,"children":5731},{},[5732],{"type":26,"value":5733},"VideoTagger",{"type":21,"tag":178,"props":5735,"children":5736},{},[5737,5755,5773,5791],{"type":21,"tag":160,"props":5738,"children":5739},{},[5740,5745,5750],{"type":21,"tag":185,"props":5741,"children":5742},{},[5743],{"type":26,"value":5744},"モデルの実行場所",{"type":21,"tag":185,"props":5746,"children":5747},{},[5748],{"type":26,"value":5749},"遠隔の GPU サーバー",{"type":21,"tag":185,"props":5751,"children":5752},{},[5753],{"type":26,"value":5754},"あなたの CPU / GPU",{"type":21,"tag":160,"props":5756,"children":5757},{},[5758,5763,5768],{"type":21,"tag":185,"props":5759,"children":5760},{},[5761],{"type":26,"value":5762},"動画の送信先",{"type":21,"tag":185,"props":5764,"children":5765},{},[5766],{"type":26,"value":5767},"第三者にアップロード",{"type":21,"tag":185,"props":5769,"children":5770},{},[5771],{"type":26,"value":5772},"ローカルディスクのまま",{"type":21,"tag":160,"props":5774,"children":5775},{},[5776,5781,5786],{"type":21,"tag":185,"props":5777,"children":5778},{},[5779],{"type":26,"value":5780},"ネットワーク",{"type":21,"tag":185,"props":5782,"children":5783},{},[5784],{"type":26,"value":5785},"解析のたびに必要",{"type":21,"tag":185,"props":5787,"children":5788},{},[5789],{"type":26,"value":5790},"不要 — 完全オフライン動作",{"type":21,"tag":160,"props":5792,"children":5793},{},[5794,5799,5804],{"type":21,"tag":185,"props":5795,"children":5796},{},[5797],{"type":26,"value":5798},"分単位の課金",{"type":21,"tag":185,"props":5800,"children":5801},{},[5802],{"type":26,"value":5803},"多くの場合あり",{"type":21,"tag":185,"props":5805,"children":5806},{},[5807],{"type":26,"value":5808},"ライセンス費以外なし",{"type":21,"tag":22,"props":5810,"children":5811},{},[5812],{"type":26,"value":5813},"VideoTagger が動画を解析するとき、モデルはあなたのマシンのメモリ上に読み込まれ、ファイルに対してその場で実行されます。アップロード処理も、フレームを運ぶ API 呼び出しも、どこかのバケットに残る一時コピーも存在しません。",{"type":21,"tag":42,"props":5815,"children":5817},{"id":5816},"実務上のメリット-3-点",[5818],{"type":26,"value":5819},"実務上のメリット 3 点",{"type":21,"tag":1880,"props":5821,"children":5823},{"id":5822},"_1-アップロードできない素材も活用できる",[5824],{"type":26,"value":5825},"1. アップロードできない素材も活用できる",{"type":21,"tag":22,"props":5827,"children":5828},{},[5829],{"type":26,"value":5830},"世の中の「価値ある素材」の多くは、同時に「他社サーバーに上げられない素材」でもあります。",{"type":21,"tag":61,"props":5832,"children":5833},{},[5834,5839,5844,5849],{"type":21,"tag":65,"props":5835,"children":5836},{},[5837],{"type":26,"value":5838},"NDA 下のクライアント素材",{"type":21,"tag":65,"props":5840,"children":5841},{},[5842],{"type":26,"value":5843},"クラウド処理に同意していないインタビュー対象者の映像",{"type":21,"tag":65,"props":5845,"children":5846},{},[5847],{"type":26,"value":5848},"社内録画 — 会議・研修・防犯カメラなど",{"type":21,"tag":65,"props":5850,"children":5851},{},[5852],{"type":26,"value":5853},"個人の家族動画",{"type":21,"tag":22,"props":5855,"children":5856},{},[5857],{"type":26,"value":5858},"クラウド型のツールでは、これらの素材は単純に「使えない」状態になります。VideoTagger ではドラッグ＆ドロップするだけの普通のファイルとして扱えます。",{"type":21,"tag":1880,"props":5860,"children":5862},{"id":5861},"_2-ネットワーク不要行列なし",[5863],{"type":26,"value":5864},"2. ネットワーク不要・行列なし",{"type":21,"tag":22,"props":5866,"children":5867},{},[5868,5870,5875],{"type":26,"value":5869},"オンデバイス処理にはあまり語られない利点があります。それは",{"type":21,"tag":34,"props":5871,"children":5872},{},[5873],{"type":26,"value":5874},"安定したスループット",{"type":26,"value":5876},"です。何千人もの他ユーザーと GPU プールを共有することもなく、レート制限を受けることもなく、ベンダー側の障害ステータスに振り回されることもありません。",{"type":21,"tag":22,"props":5878,"children":5879},{},[5880],{"type":26,"value":5881},"マシンが速ければインデックスも速い。200 本のバッチを夜間に投入すれば、朝には完了している。シンプルで、予測可能です。",{"type":21,"tag":1880,"props":5883,"children":5885},{"id":5884},"_3-コストはライセンス費で止まる",[5886],{"type":26,"value":5887},"3. コストはライセンス費で止まる",{"type":21,"tag":22,"props":5889,"children":5890},{},[5891],{"type":26,"value":5892},"クラウド AI サービスは、動画の分数・API 呼び出し回数・アクティブユーザー数で課金されるのが一般的です。これはアーカイブが大きくなるほど増えていく — インデックスの価値が高まる方向と、まったく逆の動き方をします。",{"type":21,"tag":22,"props":5894,"children":5895},{},[5896],{"type":26,"value":5897},"VideoTagger には分単位の課金はありません。100 本でも 10,000 本でも、コストは変わりません。",{"type":21,"tag":42,"props":5899,"children":5901},{"id":5900},"トレードオフ-それでも採用した理由",[5902],{"type":26,"value":5903},"トレードオフ — それでも採用した理由",{"type":21,"tag":22,"props":5905,"children":5906},{},[5907],{"type":26,"value":5908},"ローカル実行にも当然デメリットはあります。",{"type":21,"tag":61,"props":5910,"children":5911},{},[5912,5922,5932],{"type":21,"tag":65,"props":5913,"children":5914},{},[5915,5920],{"type":21,"tag":34,"props":5916,"children":5917},{},[5918],{"type":26,"value":5919},"アプリのサイズが大きい",{"type":26,"value":5921}," — モデルをサーバーではなくインストール時に同梱しています。",{"type":21,"tag":65,"props":5923,"children":5924},{},[5925,5930],{"type":21,"tag":34,"props":5926,"children":5927},{},[5928],{"type":26,"value":5929},"初回セットアップにディスクとメモリを使う",{"type":26,"value":5931}," — 現行のノート PC ならまったく問題ない範囲ですが、ゼロではありません。",{"type":21,"tag":65,"props":5933,"children":5934},{},[5935,5940],{"type":21,"tag":34,"props":5936,"children":5937},{},[5938],{"type":26,"value":5939},"モデルを即時アップデートできない",{"type":26,"value":5941}," — 新しい機能は静かなサーバー更新ではなく、アプリのアップデートとして配布します。",{"type":21,"tag":22,"props":5943,"children":5944},{},[5945],{"type":26,"value":5946},"引き換えに、素材はあなたのものであり続け、オフラインでも仕事ができ、コストはフラットに保たれます。多くのユーザーの仕事には、これが正しい交換だと考えています。",{"type":21,"tag":42,"props":5948,"children":5950},{"id":5949},"テレメトリーについて一言",[5951],{"type":26,"value":5949},{"type":21,"tag":22,"props":5953,"children":5954},{},[5955,5957,5963],{"type":26,"value":5956},"「オンデバイス AI」が意味を持つのは、アプリの他の部分が同じ境界を尊重している場合だけです。VideoTagger は最小限の診断イベント（クラッシュ、基本的な利用シグナル）のみを送信し、それ以外は送りません。フレームもファイル名もタグも一切送信されません。設定から完全にオプトアウトできます。詳細は",{"type":21,"tag":1085,"props":5958,"children":5960},{"href":5959},"/privacy",[5961],{"type":26,"value":5962},"プライバシーポリシー",{"type":26,"value":5964},"に記載しています。",{"type":21,"tag":42,"props":5966,"children":5967},{"id":427},[5968],{"type":26,"value":427},{"type":21,"tag":22,"props":5970,"children":5971},{},[5972],{"type":26,"value":5973},"「アップロード」のステップに引っかかって AI 動画ツールの導入をためらってきた方にこそ、VideoTagger は向いています。素材を AI に送るのではなく、AI が素材のもとへやってくる、という形です。",{"type":21,"tag":22,"props":5975,"children":5976},{},[5977],{"type":26,"value":5978},"まずは一番センシティブな素材で試してみてください。それが本当に意味のあるテストです。",{"title":7,"searchDepth":455,"depth":455,"links":5980},[5981,5982,5987,5988,5989],{"id":5689,"depth":455,"text":5692},{"id":5816,"depth":455,"text":5819,"children":5983},[5984,5985,5986],{"id":5822,"depth":2298,"text":5825},{"id":5861,"depth":2298,"text":5864},{"id":5884,"depth":2298,"text":5887},{"id":5900,"depth":455,"text":5903},{"id":5949,"depth":455,"text":5949},{"id":427,"depth":455,"text":427},"content:articles:ja:on-device-ai.md","articles/ja/on-device-ai.md","articles/ja/on-device-ai",{"_path":5994,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":5995,"description":5996,"slug":5997,"date":5998,"category":12,"tags":5999,"body":6002,"_type":464,"_id":6434,"_source":466,"_file":6435,"_stem":6436,"_extension":469},"/articles/ja/introducing-videotagger","動画を効率的に管理する — VideoTagger のご紹介","ライブラリが大きくなると、フォルダとファイル名による管理は限界を迎えます。VideoTagger は動画の中の「モーメント」をインデックス化し、必要なシーンを数秒で見つけて再利用できるようにします。","introducing-videotagger","2026-05-02",[6000,2317,6001],"introduction","ai-tagging",{"type":18,"children":6003,"toc":6426},[6004,6009,6015,6020,6045,6050,6056,6072,6077,6097,6102,6107,6112,6152,6157,6190,6195,6207,6331,6350,6355,6360,6403,6408,6421],{"type":21,"tag":22,"props":6005,"children":6006},{},[6007],{"type":26,"value":6008},"1時間のクリップから 1 カットを探すために 20 分もスクラブした経験があるなら、この問題はよくご存じのはずです。動画ライブラリが大きくなるほど、フォルダとファイル名による管理は破綻していきます。",{"type":21,"tag":42,"props":6010,"children":6012},{"id":6011},"課題-フォルダは動画管理のために作られていない",[6013],{"type":26,"value":6014},"課題: フォルダは動画管理のために作られていない",{"type":21,"tag":22,"props":6016,"children":6017},{},[6018],{"type":26,"value":6019},"多くの人が使っている動画整理の方法は、テープ時代からほとんど変わっていません。",{"type":21,"tag":61,"props":6021,"children":6022},{},[6023,6028,6033],{"type":21,"tag":65,"props":6024,"children":6025},{},[6026],{"type":26,"value":6027},"ファイルは日付・プロジェクト・カメラごとにフォルダで分ける",{"type":21,"tag":65,"props":6029,"children":6030},{},[6031],{"type":26,"value":6032},"ファイル名には何とか入力できる範囲のメタデータを詰め込む",{"type":21,"tag":65,"props":6034,"children":6035},{},[6036,6038,6043],{"type":26,"value":6037},"ファイルの",{"type":21,"tag":34,"props":6039,"children":6040},{},[6041],{"type":26,"value":6042},"中身（実際のシーン）",{"type":26,"value":6044},"は、ファイルシステムからは完全に見えない",{"type":21,"tag":22,"props":6046,"children":6047},{},[6048],{"type":26,"value":6049},"クリップが 10 本ならこれで十分です。しかし 1,000 本になると一気に破綻します。「あのシーンはあったはず」と思っても、どのファイルのどの位置にあるのかが分からない。素材は手元にあるのに、辿り着けない、という状態です。",{"type":21,"tag":42,"props":6051,"children":6053},{"id":6052},"解決策-ファイルではなくモーメントをインデックス化する",[6054],{"type":26,"value":6055},"解決策: ファイルではなく「モーメント」をインデックス化する",{"type":21,"tag":22,"props":6057,"children":6058},{},[6059,6063,6065,6070],{"type":21,"tag":34,"props":6060,"children":6061},{},[6062],{"type":26,"value":5733},{"type":26,"value":6064}," はこの問題に別のアプローチを取ります。動画を 1 つの不透明なファイルとして扱うのではなく、ローカルで動作する AI が映像の中身を解析し、人物・物体・シーン・行動を認識して、",{"type":21,"tag":34,"props":6066,"children":6067},{},[6068],{"type":26,"value":6069},"1 つひとつのモーメント",{"type":26,"value":6071},"を検索可能・タグ付け可能な単位としてインデックス化します。",{"type":21,"tag":22,"props":6073,"children":6074},{},[6075],{"type":26,"value":6076},"発想の転換はシンプルですが本質的です。",{"type":21,"tag":1965,"props":6078,"children":6079},{},[6080],{"type":21,"tag":22,"props":6081,"children":6082},{},[6083,6088,6090,6095],{"type":21,"tag":34,"props":6084,"children":6085},{},[6086],{"type":26,"value":6087},"ファイル",{"type":26,"value":6089},"を管理するのをやめ、",{"type":21,"tag":34,"props":6091,"children":6092},{},[6093],{"type":26,"value":6094},"モーメント",{"type":26,"value":6096},"を管理する。",{"type":21,"tag":22,"props":6098,"children":6099},{},[6100],{"type":26,"value":6101},"90 分のインタビュー動画は、もはやフォルダの中の 1 行ではありません。個別に呼び出せる数十のタグ付きモーメントになります。",{"type":21,"tag":42,"props":6103,"children":6105},{"id":6104},"想定する使い方",[6106],{"type":26,"value":6104},{"type":21,"tag":22,"props":6108,"children":6109},{},[6110],{"type":26,"value":6111},"VideoTagger が想定しているワークフローは 3 ステップです。",{"type":21,"tag":4132,"props":6113,"children":6114},{},[6115,6125,6142],{"type":21,"tag":65,"props":6116,"children":6117},{},[6118,6123],{"type":21,"tag":34,"props":6119,"children":6120},{},[6121],{"type":26,"value":6122},"認識する",{"type":26,"value":6124}," — 動画を VideoTagger に取り込みます。AI はローカルで動作し、モーメントを自動でタグ付けします。素材はあなたの PC から外に出ません。",{"type":21,"tag":65,"props":6126,"children":6127},{},[6128,6133,6135,6140],{"type":21,"tag":34,"props":6129,"children":6130},{},[6131],{"type":26,"value":6132},"整理する",{"type":26,"value":6134}," — 閲覧・グループ化したり、AI のタグの上に独自のタグを追加します。",{"type":21,"tag":34,"props":6136,"children":6137},{},[6138],{"type":26,"value":6139},"自分のプロジェクトに合った語彙",{"type":26,"value":6141},"を育てていけます。",{"type":21,"tag":65,"props":6143,"children":6144},{},[6145,6150],{"type":21,"tag":34,"props":6146,"children":6147},{},[6148],{"type":26,"value":6149},"見つけて再利用する",{"type":26,"value":6151}," — タグ・人物・シーン、あるいはその組み合わせで検索します。該当のモーメントが瞬時に返ってきます。",{"type":21,"tag":22,"props":6153,"children":6154},{},[6155],{"type":26,"value":6156},"必要なモーメントが揃ったら、VideoTagger では次のことができます。",{"type":21,"tag":61,"props":6158,"children":6159},{},[6160,6170,6180],{"type":21,"tag":65,"props":6161,"children":6162},{},[6163,6168],{"type":21,"tag":34,"props":6164,"children":6165},{},[6166],{"type":26,"value":6167},"選んだモーメントを新しい動画セグメントとして書き出す",{"type":26,"value":6169}," — ハイライトリール、B ロール、簡易な納品物に最適",{"type":21,"tag":65,"props":6171,"children":6172},{},[6173,6178],{"type":21,"tag":34,"props":6174,"children":6175},{},[6176],{"type":26,"value":6177},"連続再生する",{"type":26,"value":6179}," — テープを早送りせずに、テイク確認や素材スカウティングが可能",{"type":21,"tag":65,"props":6181,"children":6182},{},[6183,6188],{"type":21,"tag":34,"props":6184,"children":6185},{},[6186],{"type":26,"value":6187},"タイムラインに送る",{"type":26,"value":6189}," — 選別済みクリップを愛用の編集ソフトに渡し、すぐに編集を開始",{"type":21,"tag":42,"props":6191,"children":6193},{"id":6192},"既存のワークフローへの組み込み方",[6194],{"type":26,"value":6192},{"type":21,"tag":22,"props":6196,"children":6197},{},[6198,6200,6205],{"type":26,"value":6199},"VideoTagger は、編集ソフトを置き換えるのではなく、その",{"type":21,"tag":34,"props":6201,"children":6202},{},[6203],{"type":26,"value":6204},"手前",{"type":26,"value":6206},"に挟み込むことを想定して設計されています。",{"type":21,"tag":152,"props":6208,"children":6209},{},[6210,6231],{"type":21,"tag":156,"props":6211,"children":6212},{},[6213],{"type":21,"tag":160,"props":6214,"children":6215},{},[6216,6221,6226],{"type":21,"tag":164,"props":6217,"children":6218},{},[6219],{"type":26,"value":6220},"工程",{"type":21,"tag":164,"props":6222,"children":6223},{},[6224],{"type":26,"value":6225},"従来",{"type":21,"tag":164,"props":6227,"children":6228},{},[6229],{"type":26,"value":6230},"VideoTagger 導入後",{"type":21,"tag":178,"props":6232,"children":6233},{},[6234,6251,6274,6292,6309],{"type":21,"tag":160,"props":6235,"children":6236},{},[6237,6241,6246],{"type":21,"tag":185,"props":6238,"children":6239},{},[6240],{"type":26,"value":4373},{"type":21,"tag":185,"props":6242,"children":6243},{},[6244],{"type":26,"value":6245},"カメラ → SD カード",{"type":21,"tag":185,"props":6247,"children":6248},{},[6249],{"type":26,"value":6250},"同じ",{"type":21,"tag":160,"props":6252,"children":6253},{},[6254,6259,6264],{"type":21,"tag":185,"props":6255,"children":6256},{},[6257],{"type":26,"value":6258},"取り込み",{"type":21,"tag":185,"props":6260,"children":6261},{},[6262],{"type":26,"value":6263},"フォルダにコピー",{"type":21,"tag":185,"props":6265,"children":6266},{},[6267,6269],{"type":26,"value":6268},"フォルダにコピー ",{"type":21,"tag":34,"props":6270,"children":6271},{},[6272],{"type":26,"value":6273},"+ VideoTagger でインデックス化",{"type":21,"tag":160,"props":6275,"children":6276},{},[6277,6282,6287],{"type":21,"tag":185,"props":6278,"children":6279},{},[6280],{"type":26,"value":6281},"素材を探す",{"type":21,"tag":185,"props":6283,"children":6284},{},[6285],{"type":26,"value":6286},"手動でスクラブ",{"type":21,"tag":185,"props":6288,"children":6289},{},[6290],{"type":26,"value":6291},"タグベース検索",{"type":21,"tag":160,"props":6293,"children":6294},{},[6295,6299,6304],{"type":21,"tag":185,"props":6296,"children":6297},{},[6298],{"type":26,"value":4003},{"type":21,"tag":185,"props":6300,"children":6301},{},[6302],{"type":26,"value":6303},"Premiere / DaVinci / Final Cut",{"type":21,"tag":185,"props":6305,"children":6306},{},[6307],{"type":26,"value":6308},"同じ — VideoTagger から選別済みクリップを受け取る",{"type":21,"tag":160,"props":6310,"children":6311},{},[6312,6316,6321],{"type":21,"tag":185,"props":6313,"children":6314},{},[6315],{"type":26,"value":4228},{"type":21,"tag":185,"props":6317,"children":6318},{},[6319],{"type":26,"value":6320},"年別フォルダ",{"type":21,"tag":185,"props":6322,"children":6323},{},[6324,6326],{"type":26,"value":6325},"フォルダ ",{"type":21,"tag":34,"props":6327,"children":6328},{},[6329],{"type":26,"value":6330},"+ 永続的なモーメントインデックス",{"type":21,"tag":22,"props":6332,"children":6333},{},[6334,6336,6341,6343,6348],{"type":26,"value":6335},"既存のフォルダ構成も、編集ソフトもそのまま使えます。VideoTagger はその間に入り、アーカイブを「",{"type":21,"tag":34,"props":6337,"children":6338},{},[6339],{"type":26,"value":6340},"保管の問題",{"type":26,"value":6342},"」から「",{"type":21,"tag":34,"props":6344,"children":6345},{},[6346],{"type":26,"value":6347},"検索可能なライブラリ",{"type":26,"value":6349},"」へと変えます。",{"type":21,"tag":42,"props":6351,"children":6353},{"id":6352},"こんな方におすすめ",[6354],{"type":26,"value":6352},{"type":21,"tag":22,"props":6356,"children":6357},{},[6358],{"type":26,"value":6359},"以下のいずれかに当てはまる方は、VideoTagger がきっと役立ちます。",{"type":21,"tag":61,"props":6361,"children":6362},{},[6363,6373,6383,6393],{"type":21,"tag":65,"props":6364,"children":6365},{},[6366,6368],{"type":26,"value":6367},"1 プロジェクトで何時間ものラッシュを扱う",{"type":21,"tag":34,"props":6369,"children":6370},{},[6371],{"type":26,"value":6372},"映像制作者・編集者",{"type":21,"tag":65,"props":6374,"children":6375},{},[6376,6378],{"type":26,"value":6377},"過去アーカイブをショートやクリップに二次利用したい",{"type":21,"tag":34,"props":6379,"children":6380},{},[6381],{"type":26,"value":6382},"コンテンツクリエイター",{"type":21,"tag":65,"props":6384,"children":6385},{},[6386,6388],{"type":26,"value":6387},"インタビューや観察映像を扱う",{"type":21,"tag":34,"props":6389,"children":6390},{},[6391],{"type":26,"value":6392},"研究者・教育関係者・アナリスト",{"type":21,"tag":65,"props":6394,"children":6395},{},[6396,6398],{"type":26,"value":6397},"何年分ものホームビデオをまた観返したい",{"type":21,"tag":34,"props":6399,"children":6400},{},[6401],{"type":26,"value":6402},"ご家族・個人ユーザー",{"type":21,"tag":42,"props":6404,"children":6406},{"id":6405},"ぜひお試しください",[6407],{"type":26,"value":6405},{"type":21,"tag":22,"props":6409,"children":6410},{},[6411,6413,6419],{"type":26,"value":6412},"VideoTagger は Windows と macOS に対応し、AI 処理はすべてデバイス上で完結します。30 日間の無料トライアルをご用意しています。",{"type":21,"tag":1085,"props":6414,"children":6416},{"href":6415},"/download",[6417],{"type":26,"value":6418},"ダウンロードページ",{"type":26,"value":6420}," からどうぞ。",{"type":21,"tag":22,"props":6422,"children":6423},{},[6424],{"type":26,"value":6425},"この記事一覧では今後、ワークフローのヒント、機能の深掘り、実際のユーザー事例などを発信していきます。取り上げてほしいテーマがあれば、ぜひお知らせください。",{"title":7,"searchDepth":455,"depth":455,"links":6427},[6428,6429,6430,6431,6432,6433],{"id":6011,"depth":455,"text":6014},{"id":6052,"depth":455,"text":6055},{"id":6104,"depth":455,"text":6104},{"id":6192,"depth":455,"text":6192},{"id":6352,"depth":455,"text":6352},{"id":6405,"depth":455,"text":6405},"content:articles:ja:introducing-videotagger.md","articles/ja/introducing-videotagger.md","articles/ja/introducing-videotagger",1779253368103]