[FFmpeg-trac] #9669(avfilter:new): Subtitles video filter does not correctly rotate/position some Japanese punctuation characters in vertical ASS subtitles

[FFmpeg]

#9669: Subtitles video filter does not correctly rotate/position some Japanese
punctuation characters in vertical ASS subtitles
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             Reporter:  y3kcjd5     |                    Owner:  (none)
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by y3kcjd5):

 I'm runnign into trouble getting mpv player set up.
 Did you try changing the font in the .ass file to a font you do have as I
 described above?
 Alternatively, does the "ass" video filter also use libass? Running the
 first command with that filter instead gives more broken but more
 correctly rotated results, so if they share libass, that's not the
 problem.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9669#comment:2>
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