[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've finally figured out why the "subtitles" and "ass" filters were
 returning different results, despite both using libass for rendering; it
 turns out that the "subtitles" filter only uses the "simple" renderer in
 libass for some reason (and there's no option to change it). The "ass"
 filter can be forced to reproduce the same output by including
 "shaping=simple" in its options (the default is "auto"). I've already
 reported the underlying spacing/positioning issues on the libass github,
 so this ticket has effectively boiled down to changing the "subtitles"
 filter to use libass's "auto" rendering setting like the "ass" filter does
 by default.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9669#comment:9>
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