On Tue, Aug 20, 2024 at 02:36:53PM +0200, Lynne via ffmpeg-devel wrote: > 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.
Please dont add a new container. Such signalling can be added to existing containers with little effort. Iam also happy to help to add it to nut reminded me of this: https://xkcd.com/927/ thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Dictatorship naturally arises out of democracy, and the most aggravated form of tyranny and slavery out of the most extreme liberty. -- Plato
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