>> More generally, which is the recommanded way to cut a video with a specific >> starting point and specific length, with minimal re-encoding? >> Millions of hours of CPU-time are probably wasted to reencode >> already-perfectly-encoded content, just for cutting ;) > >Only do remux without transcoding, and let mp4 muxer use editlist to strip the >timeline from IDR to the requested start time. >The preroll at the beginning can be slow when playback, but seeking also has >the same preroll > >Other choice is use multiple groups of SPS/PPS in mp4 sample description. We >have that support in mp4 demuxer, but not >in muxer. It’s standard in specification but not widely supported. So if we >add support to muxer and it works with our own >demuxer, it’s not surprise to experience a lot of compatibility issues with >other software.
Thank you Zhao for your answer. Is there a feature already available in ffmpeg to use one of your 2 solutions? Or is someone already working on this topic? (if so, can I join this feature development?) In any case, if someone has a solution, many people are looking for a solution for this, either here: https://stackoverflow.com/questions/63548027/cut-a-video-in-between-key-frames-without-re-encoding-the-full-video-using-ffpme (closed), or here: https://superuser.com/questions/1850814/how-to-cut-a-video-with-ffmpeg-with-no-or-minimal-re-encoding. It would help many people if a ffmpeg-expert could help on this :) All the best. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
