[FFmpeg-trac] #10891(avcodec:open): Some output frames have artifacts when decoded with multithreading

[FFmpeg]

#10891: Some output frames have artifacts when decoded with multithreading
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             Reporter:  HolyWu      |                    Owner:  (none)
                 Type:  defect      |                   Status:  open
             Priority:  important   |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  h264        |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Changes (by MasterQuestionable):

 * cc: MasterQuestionable (added)
 * priority:  normal => important

Comment:

 ͏    https://streams.videolan.org/ffmpeg/incoming/10891/00006.MTS\\
 ͏    (~ 21.02 MiB; M2TS: H.264 (AVC) video, 11.044 s, 29.97 FPS,
 1920x1080, YUV 4:2:0, ~ 19.57 MiB; A52/AC-3 audio, 11.072 s, 48,000 Hz,
 346 KiB; ... ~ 1.11 MiB)

 ͏    Is it reproducible after remuxing to different container? (and
 losslessly cut only the affected segments?)\\
 ͏    [ E.g. https://bugzilla.mozilla.org/show_bug.cgi?id=1892185#c0 ]

 [ Off-Topic:\\
 ͏    Also how to extract the subtitle stream of the sample file..?
 (misdetected by current (12.84) !ExifTool as "PGS Audio")\\
 ͏    FFmpeg demands me to specify the correct
 [https://ffmpeg.org/ffmpeg.html#Main-options ͏"-f"]??\\
 ͏    [ !^ "-c copy -f sup" ("raw HDMV Presentation Graphic Stream
 subtitles") ]\\
 ͏    .\\
 ͏    “Subtitle encoding currently only possible from text to text or
 bitmap to bitmap”\\
 ͏    What's the point for "-c copy" then... ]
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Ticket URL: <https://trac.ffmpeg.org/ticket/10891#comment:5>
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