Baptiste Coudurier <baptiste.coudur...@gmail.com> added the comment:
On 12/4/10 2:40 AM, Reimar Döffinger wrote: > > Reimar Döffinger <b...@reimardoeffinger.de> added the comment: > > On Sat, Dec 04, 2010 at 12:52:30AM +0000, Deyan wrote: >> I tested with: mplayer, windows medial player, Firefox. > > Playback issue confirmed with ffplay, too. > Using FFmpeg to transcode to a different format also keeps the "hang". > Useing "-vcodec copy -f framecrc" shows the difference is in the > timestamps: the "good" (I have some doubts that it isn't just > less horrible) file has timestamp jumps a bit spread out all > over, whereas the bad one has more gradual time-stamps but then > a large jump. > Typical excerpt from the diff good to bad: > 0, 30030, 47, 0x9f471ae3 > 0, 33784, 14, 0x3987078d > 0, 37538, 22979, 0x975c0c10 > -0, 48799, 469, 0x4624cd4d > -0, 52553, 128, 0xe6c93b29 > -0, 56306, 116, 0x6e73317c > +0, 41291, 469, 0x4624cd4d > +0, 45045, 128, 0xe6c93b29 > +0, 48799, 116, 0x6e73317c > 0, 60060, 22954, 0xe74718ed > > I suspect that this is only an issue with variable frame-rate > input, explicitly specifying -r before the output when encoding > might help. > Note that since this depends on encoder version, it might well be > related to this in libtheoraenc.c (note that there are more reasons > than just multithreading that would cause this to break): > // HACK: assumes no encoder delay, this is true until libtheora becomes > // multithreaded (which will be disabled unless explictly requested) > avc_context->coded_frame->pts = frame->pts; > avc_context->coded_frame->key_frame = !(o_packet.granulepos & > h->keyframe_mask); Sort of, the problem is that the encoder outputs 0 bytes frames. Comment here: 1. Your video starts out with digital black. Theora responds by producing a single frame of black, and then zero-byte "dup frames" indicating that nothing has changed. Some players are broken and don't handle these frames correctly. Correctly working players, such as Firefox, shouldn't have a problem, though. Are we supposed to write these frames in the ogg file ? ________________________________________________ FFmpeg issue tracker <iss...@roundup.ffmpeg.org> <https://roundup.ffmpeg.org/issue2398> ________________________________________________
