[FFmpeg-trac] #9002(avfilter:new): subtitles filter fails to display all ASS subtitles

FFmpeg trac at avcodec.org
Fri Mar 26 16:37:09 EET 2021

#9002: subtitles filter fails to display all ASS subtitles
             Reporter:  aphysically  |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  ass libass   |               Blocked By:
  subtitles                          |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |

Comment (by aphysically):

 Further investigated showed the bug cannot be reproduced if the attached
 `99-color-emoji.conf` is not in my `~/.config/fontconfig/conf.d` folder.
 The intention of this file is to override all emoji codepoints with the
 Noto Color emoji. Note there is no emoji in the testcase being rendered
 here. I currently am unaware of any issues conceptually with this
 fontconfig file and I haven't seen any issues with other software, so I
 suspect this may point to an issue with the way fontconfig fallbacks are
 handled in ffmpeg's subtitles filter.

Ticket URL: <https://trac.ffmpeg.org/ticket/9002#comment:3>
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