dither-depth

mpv Information

mpv v0.40.0-dev-g967dcf383 Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
 built on Aug  7 2025 15:55:23
libplacebo version: v7.352.0
FFmpeg version: e052277
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

- Windows version: 24H2
- GPU model, driver and version: RTX4080
- Source of mpv: mpv test build
- Latest known working version: unknown
- Issue started after the following happened: unknown

Reproduction Steps

My display output depth is 10 bit.
The GPU driver's output depth is 10 bit.
Set dither-depth in mpv to 10 would generate bandings. While setting to 8 is safe.

Expected Behavior

No banding with dither-depth=10. (The img is output with dither-depth=8)

Actual Behavior

Noticeable bandings. (The img is output with dither-depth=10)

Log File

mpv-d8.log
mpv-d10.log

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.

Start by comparing the attached mpv-d8.log and mpv-d10.log and trace how the dither-depth setting affects video output on the Windows and RTX4080 setup described. Done means reproducing the banding with dither-depth=10 and confirming that the output no longer bands at the reported 10-bit display and driver depth.