[HELP] Strange input PAR

[Selur]

You really got a hand for finding totally screwed content.
Turning the brightness up and looking through the clip.
Tons of macro blocks due to over compression and the chroma is broken.

Since I had some time,...

Throwing away half the chroma resolution, by using:

[Y, U, V] = core.std.SplitPlanes(clip)
X = 2 # maybe 2.5
U = core.resize.Bilinear(U, height=clip.height/X)
U = core.resize.Bilinear(U, height=clip.height)
V = core.resize.Bilinear(V, height=clip.height/X)
V = core.resize.Bilinear(V, height=clip.height)
clip = core.std.ShufflePlanes(clips=[Y, U, V], planes=[0, 0, 0], colorfamily=vs.YUV)

in a custom section can help with some of the chroma mess:

adding BalanceBorders

bbmod(c=clip,cLeft=16,cTop=0,cRight=8,cBottom=16)

under the cropping in the filter order, helps with some of the issues at the corners.

adding MCDeGrainSharp and DeSpot also helps a bit cleaning it up.:

adding some deblocking (maybe this was a bit strong)

script: https://pastebin.com/tT61Wwcu
=> Before upscaling (used only bicubic for the preview) such content, I would recommend doing some cleaning. (and maybe after the resizing some light sharpening)

Cu Selur