[FFmpeg-trac] #9867(avformat:open): Cannot remove "default" disposition of mov_text subtitle in mp4

[FFmpeg]

#9867: Cannot remove "default" disposition of mov_text subtitle in mp4
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             Reporter:  liancea     |                    Owner:  (none)
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Changes (by mkver):

 * status:  new => open
 * component:  undetermined => avformat

Comment:

 I can confirm that default_mode is an mkv-muxer option that will
 definitely be ignored by the mp4 muxer.

 The mov muxer always sets one stream of each type to default; this is done
 in enable_tracks() (mainly the last loop in it, lines 6704-6715 in
 libavformat/movenc.c as of this writing). One would have to add an option
 similar to the mkv muxer's default_mode to do as you want (or one would
 have to directly map the AV_DISPOSITION_DEFAULT to MOV_TRACK_ENABLED).
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Ticket URL: <https://trac.ffmpeg.org/ticket/9867#comment:1>
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