[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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Comment (by Gregory Beauregard):

 I don't believe it's a bug, but it's worth nothing the subtitles filter
 doesn't accept the subtitles.txt playlist directly hence trying to concat
 demux it separately.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9001#comment:8>
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