[FFmpeg-trac] #9436(undetermined:new): 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:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by Andre):

 * Attachment "chap.mkv" added.

 sample video file with chapters
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Ticket URL: <https://trac.ffmpeg.org/ticket/9436>
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