#4904: Broken vp9 decoding after failed seek in webm file
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Reporter: cehoyos | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: git-master | undetermined
Keywords: mkv vp9 | Resolution:
seek | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by gjdfgh):
Looking at this closer...
- the file has only 1 index entry for video, pointing to the first packet
- the video could indeed have only 1 keyframe (didn't check)
- libavformat's demuxer "gives up" and does an *incorrect* seek (probably
a fix for other broken files produced by lavf, I seem to remember a
specific one)
- the incorrect seek of course confuses the decoder, because the decoder
only gets midstream packets
- the correct behavior is seeking to the correct index entry, and decoding
the video until the seek target is reached
The latter is confirmed to work with lavfilters and mpv.
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Ticket URL: <https://trac.ffmpeg.org/ticket/4904#comment:3>
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