On 20/08/2024 14:13, b...@gget.it wrote:
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 :)
AVTransport, the new container I'm working on, supports more flexible signalling of decoded but discarded refs. Still WIP so no support for it in FFmpeg, but hopefully not for too long.
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