Opened 17 months ago

Closed 17 months ago

#11566 closed defect (wontfix)

Arabic subtitles rendering artifact for lacking font support

Reported by: ellat Owned by:
Priority: normal Component: ffmpeg
Version: git-master Keywords: subtitles
Cc: ellat, MasterQuestionable Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: yes

Description (last modified by ellat)

Summary of the bug:
How to reproduce:
Create the file sub.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=sub.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.

Change History (2)

comment:1 by ellat, 17 months ago

Description: modified (diff)

comment:2 by MasterQuestionable, 17 months ago

Analyzed by developer: set
Cc: MasterQuestionable added
Resolution: → wontfix
Status: new → closed
Summary: Arabic subtitles rendering artifact BUG → Arabic subtitles rendering artifact for lacking font support

͏    Such square box is fundamentally fonts issue.
͏    ​https://invent.kde.org/-/project/19/uploads/1fcc483f909f20539836dc25b857dd24/image.png
͏    .
͏    As you've reckoned:
͏    ​https://bugs.kde.org/show_bug.cgi?id=502725#c3

͏    Characters maybe unsupported by the font.
͏    Nothing FFmpeg can help.

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