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ffmpegを用いて入力動画の`左上 (350,0)`から、`横1570*縦1080`のエリアを切り取る

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ffmpegを用いて入力動画の左上 (350,0)から、横1570*縦1080のエリアを切り取るには以下のようにすればOK

% ffmpeg -i test.mp4 -vf crop=w=1570:h=1080:x=350:y=0 test2.mp4

左上の座標の位置の調整が要りそうな場合は、1secの動画を先に抽出しておき、これに対して調整施すと便利。

https://jp.videoproc.com/edit-convert/cut-videos-using-ffmpeg.htm

ffmpeg -ss [開始時間] -i [入力ファイル] -to [終了時間] -c copy [出力ファイル]

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