Stuttering during playback with plasma 6.2 + wayland and 23.976Hz or 24Hz refresh rates.

[adolfotregosa]

mpv Information

mpv --version
mpv v0.39.0 Copyright © 2000-2024 mpv/MPlayer/mplayer2 projects
 built on Dec 30 2024 18:37:37
libplacebo version: v7.349.0
FFmpeg version: git-2024-12-27-5f38c82536
FFmpeg library versions:
   libavcodec      61.28.100
   libavdevice     61.4.100
   libavfilter     10.6.101
   libavformat     61.9.102
   libavutil       59.53.100
   libswresample   5.4.100
   libswscale      8.13.100

Other Information

- Linux version: CachyOS Linux
- Kernel Version: 6.13.0-rc4-1-cachyos-rc
- GPU Model: AMD iGPU M780
- Mesa/GPU Driver Version: Mesa 24.3.2-cachyos1.2
- Window Manager and Version: kde 6.2.4 
- Source of mpv: tried both stock cachyos ffmpeg+mpv and self compiled 0.39 + latest ffmpeg 
- Latest known working version: none 
- Issue started after the following happened: I don't know. This computer is new to me.

At 23.976Hz or 24Hz refresh rates, videos stutter randomly. However, at 120Hz, they don't. On X11, it's fine as far as I can tell perfect. Using my other computer on the same TV, which has an Nvidia card, I don't see this issue on either X11 or Wayland, so I'm leaning towards it being something related to the AMD (i)GPU + wayland. I’ve tried all the combinations I could think of with --hwdec, --gpu-api, --vo, --video-sync and --gpu-context without any success. The issue is only present in wayland.

Any suggestions ??

EDIT: At 120Hz using a 24Hz sample file so it's a multiple, stutters are there, just not as pronounced.
Now I'm really out of ideas lol.

EDIT2:
mpv FPS_test_1080p24_L4.1.mkv --hwdec=auto --vo=gpu-next --video-sync=display-resample --gpu-context=x11egl
At least at 120Hz, this combination helps tremendously, at 24Hz , still stutters.

Reproduction Steps

The computer must be connected to a TV or monitor capable of switching the refresh rate to 23.976Hz or 24Hz. I use the well-known mpv-kscreen-doctor.lua script to achieve this automatically. https://gitlab.com/smaniottonicola/mpv-kscreen-doctor
Play the sample file I attached and simply watch the moving bars. At some point they stutter badly.

Expected Behavior

No stutters

Actual Behavior

stutters

Log File

output.txt

Sample Files

FPS_test_1080p23.976_L4.zip
FPS_test_1080p24_L4.zip

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.