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astrange on Nov 28, 2022 | parent | context | favorite | on: Guide to FFmpeg

You shouldn't need to care about that; video formats should support clipping to non-keyframes by including the preceding GOP at negative playback times, so it skips to the frame you started the clip at.

(MOV in fact does support this, but ffmpeg doesn't play it back properly.)

gyan on Nov 29, 2022 [–]

> ffmpeg doesn't play it back properly

Can't repro here.

Commands:

  ffmpeg -ss X -i INPUT -c copy -t 10 test.mp4
  ffplay test.mp4

where X is not a KF time. Plays from X with audio in sync for 10 secs.

astrange on Nov 29, 2022 | [–]

Well, I haven't tried it recently, but it's probably rounding your start time to the nearest keyframe.

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