чт, 11 янв. 2024 г., 17:42 Nicolas Gaullier <nicolas.gaullier@cji.paris>:
> >De : ffmpeg-user <ffmpeg-user-boun...@ffmpeg.org> De la part de Andrew > Randrianasulu > > > >But as it was said in forum post above - ffprobe a bit slow, few > minutes for whole video, eating one cpu core completely. > > > >Is there faster way to get this info ? > Closed vs open gop is usually a local "keyframe" matter. It is not clear > to me what is your intent : do you want to make sure 100% of the keyframes > are closed gop ? > yes, I want to check my pre-existing videos for this, partially for testing how various tools (avidemux, vidcut, ffmpeg) can cut them, partially because I suspect this may play some role in how badly mesa's vdpau driver on vp5 based nvidia hw decoder reacts to seeks (if majority of internet streams today are closed-gop, then I might trigger some less-common codepath with my home-encoded videos ). If so, you have to parse the stream, so indeed, it takes a long time. I > don't think there is another option. MP4 muxer only has the global > "keyframe" info. With quicktime/mpeg2 you would have gotten stss/stps = > closed/open gop distinction, but it is not your use case. > Only one thing: as you noticed using MediaInfo, when encoding with > libx264, there is an SEI describing the encoding parameters and you can get > the "open_gop" field. > If you get a very fresh (less than 2 weeks) ffmpeg build, there is an > option to display this with the showinfo filter: > ffmpeg -i xxx.mp4 -vf showinfo=udu_sei_as_ascii=1 -frames 1 -f null null > thanks, I have ffmpeg git as part of mplayer, but also can compile it separately. > > Nicolas > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
