[FFmpeg-trac] #9056(undetermined:new): Subtitle disposition 0 not honored

[FFmpeg]

#9056: Subtitle disposition 0 not honored
-------------------------------------+-------------------------------------
             Reporter:  cs9qm        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  subtitle     |               Blocked By:
  disposition                        |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 ffmpeg does not seem to honor the "disposition:s:0 0" flag, which should
 set the subtitle as not default/forced. This used to work in earlier
 versions of ffmpeg.

 I can reproduce the regression between two different versions of ffmpeg,
 using the same command line:

 ffmpeg  -v 9 -loglevel 99 -report -i in.mkv -c copy -disposition:s:0 0
 out-2021-01-05.mkv

 the video contains one h264 stream, one jpeg poster, one eac3 stream and
 one subrip subtitle stream (but the problem seems to apply to all videos).

 this older version (2019) behaves normally (the subtitle is not set as
 default):
 ffmpeg version N-94452-g9af8ce754b Copyright (c) 2000-2019 the FFmpeg
 developers

 this more recent version leaves the subtitle as default:
 ffmpeg version N-100560-g5f9632e491 Copyright (c) 2000-2021 the FFmpeg
 developers


 I do not have enough historical builds to identify when exactly the
 regression was introduced, but it has to be between 2019-07-16 and
 2020-09-30

 I uploaded the full ffmpeg log report for both runs if it helps

 https://zbpublic.blob.core.windows.net/public/out-2019-08-03.log

 https://zbpublic.blob.core.windows.net/public/out-2021-01-05.log

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Ticket URL: <https://trac.ffmpeg.org/ticket/9056>
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