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並前往https://itectec.com/superuser/cutting-videos-at-exact-frames-with-ffmpeg-select-filter/

Cutting videos at exact frames with ffmpeg select filter - iTecTec

Note: movie.mp4 has 25 fps, and its audio sample rate 48k ffmpeg -i movie.mp4 -an -vf "select=between(n\,250\,750),setpts=PTS-STARTPTS" v_stream.webm.

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