Unreadable OSD when COLRv1 emoji font prioritized in fontconfig

mpv Information

mpv v0.40.0 Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
libplacebo version: v7.351.0
FFmpeg version: 7.1.1 (runtime 7.1.2)
FFmpeg library versions:
   libavcodec      61.19.101
   libavdevice     61.3.100
   libavfilter     10.4.100
   libavformat     61.7.100
   libavutil       59.39.100
   libswresample   5.3.100
   libswscale      8.3.100

Other Information

- Linux version: Fedora Linux
- Kernel Version: Linux luklap 6.18.3-200.fc43.x86_64 #1 SMP PREEMPT_DYNAMIC Fri Jan  2 20:10:56 UTC 2026 x86_64 GNU/Linux
- GPU Model: 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation G96CM [GeForce 9600M GT] [10de:0649] (rev a1)
- Mesa/GPU Driver Version: OpenGL version string: 3.3 (Compatibility Profile) Mesa 25.2.5
- Window Manager and Version: sway version 1.11
- Source of mpv: Fedora's RPMs
- Latest known working version: None
- Issue started after the following happened: Fedora switched to COLORv1 as seen at https://docs.fedoraproject.org/en-US/fedora/latest/release-notes/desktop/#colr-for-noto-color-emoji

Reproduction Steps

1. change your /home/$USER/.config/fontconfig/fonts.conf to (the guide is at https://www.reddit.com/r/linux/comments/grxawm/comment/fsb0jnw/?force-legacy-sct=1 and I use it to have color emojis in terminal and chromium)

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
<fontconfig>
  <alias>
    <family>sans-serif</family>
    <prefer>
      <family>DejaVu Sans</family>
    </prefer>
  </alias>
  <alias>
    <family>serif</family>
    <prefer>
      <family>DejaVu Serif</family>
    </prefer>
  </alias>
  <alias>
    <family>monospace</family>
    <prefer>
      <family>DejaVu Sans Mono</family>
    </prefer>
  </alias>
  <alias>
    <family>emoji</family>
    <prefer>
      <family>Noto Color Emoji</family>
    </prefer>
  </alias>
  <match target="pattern"> 
    <edit name="family" mode="prepend" binding="weak">
      <string>Noto Color Emoji</string> 
    </edit> 
  </match>
</fontconfig>

2. restart your pc
3. start a movie in mpv
4. enter menu through "g+m" shortcut

Expected Behavior

Actual Behavior

Log File

unreadable_osd_with_priotization_of_Noto-COLRv1.txt
One can see that noto font is selected instead of dejavu.

readable_osd_without_priotization_of_Noto-COLRv1.txt
One can see that dejavu font is selected instead of noto.

I followed the guide at https://vladimir-ivanov.net/tag/fedora/ and replaced Noto-COLRv1.ttf with NotoColorEmoji.ttf and it works just as good as in Fedora 42 (the mpv version was the same there)
readable_osd_with_priotization_of_NotoColorEmoji.txt
One can see that dejavu font is selected instead of noto.

Sample Files

No response

I carefully read all instruction and confirm that I did the following:

• I tested with the latest mpv version to validate that the issue is not already fixed.
• I provided all required information including system and mpv version.
• I produced the log file with the exact same set of files, parameters, and conditions used in "Reproduction Steps", with the addition of --log-file=output.txt.
• I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
• I attached the full, untruncated log file.
• I attached the backtrace in the case of a crash.

Reproduce the issue using the supplied fontconfig configuration, then compare unreadable_osd_with_priotization_of_Noto-COLRv1.txt with readable_osd_without_priotization_of_Noto-COLRv1.txt and readable_osd_with_priotization_of_NotoColorEmoji.txt. Trace the OSD font selection and rendering path implicated by those logs; done means the OSD remains readable when the COLRv1 emoji font is prioritized.