help please

[Selur]

1. Resolution problem

# defining beforeDeblockQED-function - START
def beforeDeblockQED(clip):
clip = core.std.Crop(clip, left=10, right=10, top=0, bottom=4)
return [clip]
# defining beforeDeblockQED-function - END

might cause problems, since you didn't let Hybrid know of the new width and height. (see tool-top of 'Insert before')

2. beforeResize

# defining beforeResize-function - START
def beforeResize(clip):
# 1. Standard Upscale/Resizing
clip = core.resize.Spline36(clip, width=640, height=480, format=vs.YUV420P16)
clip = core.nnedi3cl.NNEDI3CL(clip, field=0, dh=True, nsize=4, nns=4, qual=2)
clip = core.std.Transpose(clip)
clip = core.nnedi3cl.NNEDI3CL(clip, field=0, dh=True, nsize=4, nns=4, qual=2)
clip = core.std.Transpose(clip)
clip = core.resize.Spline36(clip, matrix_in_s="170m", matrix_s="709")
clip = core.std.SetFrameProps(clip, _Matrix=1, _Transfer=1, _Primaries=1, _SARNum=1, _SARDen=1)
# 1. Strip color to kill rainbows
grey_plane = core.std.ShufflePlanes(clip, planes=0)
# 2. Rebuild as YUV so sharpeners don't crash
grey_final = core.std.ShufflePlanes(clips=[grey_plane, grey_plane, grey_plane], planes=[0,0,0], colorfamily=vs.YUV)
# 3. Swap the frames using the native Hybrid tool
import remap
clip = remap.Rfs(clip, grey_final, mappings="[12255 21450]")
return [clip]
# defining beforeResize-function - END

If you just want to turn a section into gray scale simply use Tweak with Saturation 0 and user 'ApplyOnlyTo' with your section.
About your ceo
a. also resolution handling, see above
b.

import remap
clip = remap.Rfs(clip, grey_final, mappings="[12255 21450]")

seems wrong, usually one would:
a. import the RemapFramesVapoursynth.dll via a LoadPlugin call
b. then use core.remap.Rfs
Which of the ShufflePlanes call fails?

Cu Selur