[FFmpeg-trac] #6448(undetermined:new): Gibberish Closed Captioning subtitle

[FFmpeg]

#6448: Gibberish Closed Captioning subtitle
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             Reporter:  macdavis     |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  Closed       |               Blocked By:
  Captioning                         |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 CC Subtitle is garbled. The subtitle position is also inappropriate.

 [[Image(https://camo.githubusercontent.com/573edc2f60c4c482057f4e9a7c9ca115f5ac8e55/68747470733a2f2f7773312e73696e61696d672e636e2f6c617267652f386435373439636367793166676530666d766579346a32316863306d387134662e6a7067)]]

 [[Image(https://camo.githubusercontent.com/514375fbfc44eb69da25e9fabb70c8afefdbeed5/68747470733a2f2f7773312e73696e61696d672e636e2f6c617267652f3864353734396363677931666765306d38696338746a32316863306d38337a762e6a7067)]]


 How to reproduce:
 Play "wwdc_2017_1080_cc.m4v" with MPV (download from
 http://podcasts.apple.com/apple_keynotes_1080p/2017/wwdc_2017_1080_cc.m4v)

 The issue was initially reported to MPV develepers (link:
 https://github.com/mpv-player/mpv/issues/4493). One of the developers
 suggests submit it here as "FFmpeg also fails to decode anything useful
 from it."

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Ticket URL: <https://trac.ffmpeg.org/ticket/6448>
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