Flicker

[Selur]

SpotLess with usually is a bad idea if you need a radius > 3.
The flickering is likely caused by bad deinterlacing + high compression causing aliasing.
Try something like: SMDegrain with really high values and Santiag

# removing grain using SMDegrain
clip = smdegrain.SMDegrain(input=clip, tr=6, thSAD=3200, thSADC=256, interlaced=False, opencl=True, device=-1)
# contrast sharpening using CAS
clip = core.cas.CAS(clip=clip)
# no resizing since resolution is already archived
# applying anti aliasing using santiag
clip = antiAliasing.santiag(c=clip, strh=3, strv=3, nns=2, qual=2, pscrn=2, exp=1, opencl=True)

https://www.mediafire.com/file/la853phvn...e.mp4/file
also try the above and set SMDeGrain -> DCT to "use block DCT ...", that should help a bit more. (but will be a lot slower)
Cu Selur