[FFmpeg-trac] #9001(ffmpeg:new): concat demuxed ASS subtitles stop working with subtitles filter

[FFmpeg]

#9001: concat demuxed ASS subtitles stop working with subtitles filter
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             Reporter:  Gregory      |                    Owner:  (none)
  Beauregard                         |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  ffmpeg
              Version:  git-master   |               Resolution:
             Keywords:  ass libass   |               Blocked By:
  subtitles concat                   |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Changes (by Gregory Beauregard):

 * Attachment "ffmpeg-20210804-124257.log" added.

 log for failed-to-render ffconcat case as of 08/04
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Ticket URL: <https://trac.ffmpeg.org/ticket/9001>
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