[FFmpeg-trac] #9436(undetermined:closed): Strange subtitles "Chapter 01" added when input has chapters and output is mp4

[FFmpeg]

#9436: Strange subtitles "Chapter 01" added when input has chapters and output is
mp4
-------------------------------------+-------------------------------------
             Reporter:  Andre        |                    Owner:  (none)
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:  invalid
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by mkver):

 * status:  new => closed
 * resolution:   => invalid

Comment:

 It does not appear "out of nowhere", it appears because the source file
 contained chapters and ffmpeg by default tries to preserve them. That it
 appears as a subtitle stream is an oddity of mp4, where chapters and
 subtitles are muxed similarly. But a proper player can distinguish between
 them, as ffmpeg/ffprobe do: They show it as data stream (notice the
 "Data:"), not as subtitle.
 If your mp4 player got confused by this, you can disable copying of
 chapters with -map_chapters -1.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9436#comment:1>
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