Rainbows dancing up and down

[bruno321]

I'm seeing a phenomenon I don't know how it's called. Color dancing up and down. I attach an untouched snippet. How can I take care of it?


Here's also a picture, a zoomed close-up

[Selur]

https://github.com/HomeOfVapourSynthEvolution/VapourSynth-CTMF in chroma only (planes=[1,2]) might help
quick with:

# Loading C:\Users\Selur\Desktop\snip.mkv using LWLibavSource
clip = core.lsmas.LWLibavSource(source="C:/Users/Selur/Desktop/snip.mkv", format="YUV420P8", cache=0, prefer_hw=0)
# making sure input color matrix is set as 709
clip = core.resize.Point(clip, matrix_in_s="709",range_s="limited")
# making sure frame rate is set to 24
clip = core.std.AssumeFPS(clip=clip, fpsnum=24, fpsden=1)
# Setting color range to TV (limited) range.
clip = core.std.SetFrameProp(clip=clip, prop="_ColorRange", intval=1)
# denoising using CTMF
clip = core.ctmf.CTMF(clip=clip, radius=5, memsize=1048576, planes=[1,2])
# Deinterlacing using QTGMC
clip = havsfunc.QTGMC(Input=clip, Preset="Fast", InputType=1, TR2=1, Sharpness=1.0, SourceMatch=0, Lossless=0)
# make sure content is preceived as frame based
clip = core.std.SetFieldBased(clip, 0)
# set output frame rate to 24.000fps
clip = core.std.AssumeFPS(clip=clip, fpsnum=24, fpsden=1)
# Output
clip.set_output()

and crf 18 NVEnc H.265, see attachment

[bruno321]

Thanks. But I'm using avisynth, not vapoursynth. Also, sadly in your attachment there are still some rainbows in the tree there...

While we're at it, in the source there's not only dancing rainbows, there's also a general dancing of the image, don't know how to put it better. Is there a way to stabilize it?

[Sharc]

Did you try

DeRainbow(8)  #adjust the strength (lower value=stronger)

Btw. the clip has luma 0....255 (PC). You may want to adjust it to TV range (16 ....235)? The out-of-tv range values might be noise only though ......
Is your snip.mkv an upscaled and re-encoded VHS capture or other source? If so, it's better to start from the original capture or unprocessed source.

[bruno321]

About DeRainbow, it depends on mipsmooth which is 32-bit only. I can't use it in my 64-bit installation

Re: the clip. What you say is very possible but I have little information about the original source, and I don't have access to it, so this will have to do.

[Selur]

I'm using a 64bit MipSmooth here without a problem,... (http://avisynth.nl/index.php/AviSynth%2B_x64_plugins)

[bruno321]

Thanks! I often forget to check that page, I just saw the plugin here http://avisynth.nl/index.php/MipSmooth#Spatio-Temporal_Denoisers which is 32-bit only.

It does help a lot (had to go down to 3 for the DeRainbow value)