Hardware decoding + Vulkan cause purple/blue screen when playing 4K

mpv Information

mpv 0.38.0 Copyright © 2000-2024 mpv/MPlayer/mplayer2 projects
 built on Jan  1 1980 00:00:00
libplacebo version: v7.349.0
FFmpeg version: 6.1.2
FFmpeg library versions:
   libavutil       58.29.100
   libavcodec      60.31.102
   libavformat     60.16.100
   libswscale      7.5.100
   libavfilter     9.12.100
   libswresample   4.12.100

Other Information

- Linux version: NixOS 24.11 (Vicuna)
- Kernel Version: Linux nixos 6.11.0 #1-NixOS SMP PREEMPT_DYNAMIC Sun Sep 15 14:57:56 UTC 2024 x86_64 GNU/Linux
- GPU Model: 03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Navi 22 [Radeon RX 6700/6700 XT/6750 XT / 6800M/6850M XT] [1002:73df] (rev c0)
- Mesa/GPU Driver Version: 4.6 (Compatibility Profile) Mesa 24.2.2
- Window Manager and Version:
- Source mpv: Nixpkgs
- Introduced in version:

Reproduction Steps

Playing videos larger than 2560x2560 will result in a purple screen:

I have found the option that causes the problem. The anomaly occurs when I enable both hwdec=auto-safe and gpu-api=vulkan. It does not occur if I disable hardware decoding, or use opengl as API.

The console will have a lot of repeated logs, as follows:

[vo/gpu-next/libplacebo] Requested image size 3840x2160x0 exceeds the maximum allowed dimensions 2560x2560x1 for vulkan image format 9
[vo/gpu-next/vaapi] mapping VAAPI EGL image failed
[vo/gpu-next] Mapping hardware decoded surface failed.
[vo/gpu-next/libplacebo] Could not render image for frame mixing.. disabling!

Expected Behavior

Play videos correctly and display OSC/OSD correctly

Actual Behavior

Purple screen, OSC/OSD cannot be displayed

Log File

output.txt

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 with hardware decoding and Vulkan enabled on a video larger than 2560x2560, using the exact conditions from the issue. Start with output.txt and the repeated gpu-next/libplacebo and vaapi messages, then compare against hardware decoding disabled or the OpenGL API. Done means 4K playback and OSC/OSD render correctly without the mapping or image-size errors.