[FFmpeg-trac] #911(undetermined:closed): ffplay can't handle timecodes of WMV2 video correctly
FFmpeg
trac at avcodec.org
Thu Jan 12 15:51:43 CET 2012
#911: ffplay can't handle timecodes of WMV2 video correctly
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Reporter: | Owner:
zhushisongzhu | Status: closed
Type: defect | Component:
Priority: important | undetermined
Version: git-master | Resolution:
Keywords: asf wmv2 | worksforme
seeking | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by zhushisongzhu):
Replying to [comment:8 cehoyos]:
> * H264 streams can be valid without keyframes (even without an initial
keyframe).
> * If a media player seeks exactly to a keyframe in H264, it is not
guaranteed that there will be no corruption when playing the stream
beginning from the found keyframe. (Non-keyframes after a keyframe in H264
may reference frames earlier than the last keyframe.)
>
> Both is not true for WMV, so assuming that seeking in H264 is
significantly different from seeking in WMV is safe.
> (Note that much older versions of FFmpeg seek fine in your sample, but
failed completely seeking in H264 which was only fixed a short time ago.)
Thanks for your comments. If having time, I'll spend some time to
understand more details about WMV and H264.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/911#comment:9>
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