Glitch with GPU-NEXT + HDR +VAAPI for AV1 format.

mpv Information

mpv v0.40.0-dirty Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
 built on Jul 29 2025 22:35:55
libplacebo version: v7.351.0
FFmpeg version: n7.1.1
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: Arch Linux
- Kernel Version: Linux laichiaheng 6.16.0-2-cachyos #1 SMP PREEMPT_DYNAMIC Thu, 31 Jul 2025 13:05:15 +0000 x86_64 GNU/Linux
- GPU Model: Navi 48 [Radeon RX 9070/9070 XT/9070 GRE] [1002:7550]
- Mesa/GPU Driver Version:
- Window Manager and Version: Mesa 25.3.0-devel (git-72cf81df54) (LLVM 20.1.8)
- Source of mpv: Arch Linux
- Latest known working version: none
- Issue started after the following happened: play HDR videos with AV1 format while VAAPI is enabled.

Reproduction Steps

Here is the source video from YouTube: https://www.youtube.com/watch?v=p0PE3t77weY

mpv --log-file=AV1_glitch.txt --no-config --vo=gpu-next --ytdl-raw-options=cookies-from-browser=firefox --target-colorspace-hint=auto --hwdec=vaapi --fs https://youtu.be/p0PE3t77weY

I recorded the glitch from my smart phone: https://youtube.com/shorts/uCCGXWKJlhs
It is between 00:12 to 00:15 at the top left corner.

Expected Behavior

No glitch, play smoothly.

Actual Behavior

I can see the glitch.

Log File

output.txt

Sample Files

Lots of HDR videos on YouTube.

https://www.youtube.com/watch?v=p0PE3t77weY
https://www.youtube.com/watch?v=Ji-nP3Gk8Pw

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 with the supplied YouTube sample and the exact mpv command using --vo=gpu-next, --target-colorspace-hint=auto, and --hwdec=vaapi; inspect output.txt alongside the GPU, Mesa, kernel, and FFmpeg details. Trace the GPU rendering and VAAPI path involved in HDR AV1 playback. Done means the reported top-left glitch no longer appears under the supplied conditions.