Glitchy playback with hardware acceleration (AV1 only)

mpv Information

mpv v0.41.0-UNKNOWN Copyright © 2000-2026 mpv/MPlayer/mplayer2 projects
 built on Jan  1 1980 00:00:00
libplacebo version: v7.371.0
FFmpeg version: 9.0.1
FFmpeg library versions:
   libavcodec      63.1.101
   libavdevice     63.1.101
   libavfilter     12.1.101
   libavformat     63.1.101
   libavutil       61.1.101
   libswresample   7.1.101
   libswscale      10.1.101

Other Information

- Linux version: NixOS 26.11 (Zokor)
- Kernel Version: Linux nixos 7.2.0-valve1 #1-NixOS SMP PREEMPT_DYNAMIC (Jovian NixOS)
- GPU Model: VanGogh AMD Custom GPU 0405
- Mesa/GPU Driver Version: Mesa 26.1.2
- Window Manager and Version: Xfwm4 4.20
- Source of mpv: Build from git master: 
     mpv (e8673660ab7ee5d4ea8f93e4bf3a6e170ab2a19a)
     libplacebo (41ac2980e1a898f41d7c2e07999f9862ee89d99f)
     uosc (12b918fcbcae56ded0e073a965d769bb0c5d900e)
- Latest known working version: N/A
- Issue started after the following happened: N/A

Reproduction Steps

mpv --no-config --hwdec=yes <video>

Expected Behavior

Normal playback without artifacts

hwdec=no

Actual Behavior

With hardware acceleration enabled, many videos exhibit translucent pixel artifacts.

hwdec=yes

Log File

output.txt

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

• I tested and confirmed that the issue exists with the latest release version or newer.
• 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.

Start with the exact mpv --no-config --hwdec=yes <video> reproduction and inspect output.txt, comparing it with playback using --hwdec=no. Use the reported mpv, FFmpeg, libplacebo, Mesa, GPU, and kernel versions to narrow the hardware-decoding path; done means AV1 playback no longer shows translucent pixel artifacts.