#10135: matroska/ass: Wrong AVPacket duration set for ass events with 0 duration
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Reporter: enen92 | Type: defect
Status: new | Priority: normal
Component: avformat | Version: git-master
Keywords: mkv, ass | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
Reported to Kodi (https://github.com/xbmc/xbmc/issues/21625) but the root
cause seems to be in libav. The subtitle AVPackets returned from the
demuxer have a duration > 0 that seems to result from the pts value that
the next subtitle is received.
Those subtitle events have start and end times equal to 0 and should not
be shown:
{{{
Dialogue: 0,0:00:00.00,0:00:00.00,DCMain,CONAN,0000,0000,0000,,[ed]
Dialogue: 0,0:00:00.00,0:00:00.00,DCMain,KOGORO,0000,0000,0000,,[eyecatch]
Dialogue: 0,0:00:00.00,0:00:00.00,DCMain,,0000,0000,0000,,Detective Conan
Episode 1047 "The \NRed Sheep's Eerie Game (Part One)"
Dialogue: 0,0:00:00.00,0:00:00.00,DCMain,CONAN,0000,0000,0000,,[op]
}}}
Initially matroskadec sets the start and duration times correctly (both 0)
but at some point along the chain the duration is changed.
How to reproduce:
{{{
% ffplay -vf subtitles=filename="ass_sample.mkv" ass_sample.mkv
ffmpeg version master built on linux (although it happens on all
platforms)
}}}
The entries "[ed]", "[eyecatch]", "Detective Conan Episode 1047 "The \NRed
Sheep's Eerie Game (Part One)", "[op]" should not be shown. Opening the
same file with mpv shows the correct behaviour (they don't rely on the
duration from AVPacket)
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10135>
FFmpeg <https://ffmpeg.org>
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