[FFmpeg-trac] #11566(ffmpeg:new): Arabic subtitles rendering artifact BUG

[FFmpeg]

#11566: Arabic subtitles rendering artifact BUG
-----------------------------------+--------------------------------------
             Reporter:  ellat      |                     Type:  defect
               Status:  new        |                 Priority:  normal
            Component:  ffmpeg     |                  Version:  git-master
             Keywords:  subtitles  |               Blocked By:
             Blocking:             |  Reproduced by developer:  0
Analyzed by developer:  0          |
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 Summary of the bug:
 How to reproduce:
 Create the file a.srt:

 {{{
 1
 00:00:00,000 --> 00:00:15,000
 الأسد
 }}}

 Use a random input video and run this command to burn subtitles:

 `%./ffmpeg -i input_video.mp4 -vf
 subtitles=a.srt:force_style='FontName=Arial' out.mp4`

 A box outline will appear in the middle of the arabic word.

 {{{
 ffmpeg version N-119396-g48c0dba23b-20250430 Copyright (c) 2000-2025 the
 FFmpeg developers
 built with gcc 14.2.0 (crosstool-NG 1.27.0.18_7458341)
 }}}

 According to: https://bugs.kde.org/show_bug.cgi?id=502725
 this issue has existed for 2 years.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11566>
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