> $ ffmpeg -i sintel.mpg -vcodec copy -acodec copy -ss 90.0 starting_at_90.mpg > > then try and use it again: > > $ ffmpeg -i starting_at_90.mpg -vframes 1 -f image2 -an snap.jpg > > I get this warning message: > [mpeg2video @ 01f09860] warning: first frame is no keyframe > > Anybody know if this is expected? I almost don't think it is...
My only conjecture is that, today, running "ffmpeg -ss 90.0 -vcodec copy" actually goes exactly to second 90.0, then inserts some "a few non i-frames" and then an i-frame, and continues normally. Then when I use that file, it skips past the non-i-frames until it reaches its first i-frame, and then continues on. Except I get this warning message no matter what "-ss" time I specify for my original cut (since this is from a DVD, I'd expect an i-frame at least every second, but can never find *even a single one*), which leaves me wondering what is actually occurring... Thanks! -roger- _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
