double range compression video filter fix does not work

mpv Information

mpv v0.40.0-292-g9f153e2a2 Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
 built on Aug 25 2025 00:04:47
libplacebo version: v7.353.0 (v7.351.0-63-gc674668-dirty)
FFmpeg version: N-120833-gdb2af6fd4
FFmpeg library versions:
   libavcodec      62.13.101
   libavdevice     62.2.100
   libavfilter     11.5.100
   libavformat     62.4.101
   libavutil       60.10.100
   libswresample   6.2.100
   libswscale      9.2.100

Other Information

- Windows version: Microsoft Windows [Version 10.0.19045.6216]
- GPU model, driver and version:
GPU 0

	Intel(R) HD Graphics 5500

	Driver version:	20.19.15.4531
	Driver date:	29/09/2016
	DirectX version:	12 (FL 11.1)
	Physical location:	PCI bus 0, device 2, function 0

	Utilization	1%
	Dedicated GPU memory	
	Shared GPU memory	0,5/4,0 GB
	GPU Memory	0,5/4,0 GB

- Source of mpv: Windows builds by zhongfly (git)	
- Latest known working version: -
- Issue started after the following happened: -

Reproduction Steps

have double range compressed video.
to undo this error, i tried to convert the python script below to ffmpeg filters (mpv filters)
--dither=error-diffusion --vf=scale=flags=neighbor:in_range=limited:out_range=full

Expected Behavior

(context: i tried to convert vapoursynth to mpv video filters)

src = ...
out = src.resize.Point(range_in=0, range=1, dither_type="error_diffusion")
out = out.std.SetFrameProp(prop="_ColorRange", intval=1)

https://vapoursynth.com/doc/functions/video/setframeprop.html and https://vapoursynth.com/doc/functions/video/resize.html may help
double range compression is fixed properly
https://slow.pics/c/ui8JHLyw
like this

Actual Behavior

double range compression is not fixed and another error adds to the issue: a rounding error.

Log File

output.txt

Sample Files

https://pixeldrain.com/u/CKgC8UY3

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 reproducing the reported behavior with the provided sample file, output.txt log, and --dither=error-diffusion --vf=scale=flags=neighbor:in_range=limited:out_range=full. Compare the result with the VapourSynth snippet and the slow.pics reference, then verify that both the double range compression and rounding error are resolved.