[FFmpeg-user] Frame Accurate and Fast Clip Trimming

Robert Nagy ronag89 at gmail.com
Sat Jan 31 11:34:18 CET 2015

I need to frame accurately trim the start on a long clip in a fast way.

I am aware that for frame accurate seeking one needs to decode and
re-encode a clip. However, that would be to slow for my usage.

So what I was think of was seeking to the first frame before the seek point
and decode to the first frame after the seek point. Re-encode that part and
then concat the new start with the clip from the first key after the seek

I'm not quite sure how to achieve this. In particular, how I would make
sure to seek to the keyframe after and not before for the second concat

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