letterboxing 1 pixel on top...

[Selur]

1. I would use Filtering->Vapoursynth->Line->Misc->EdgeFixer for that 1 pixel line
2. I could not reproduce your problem with the 1pixel crop looking like 2 pixel etc.
I used 'Fixed ratio' 'x12' and 'nearest neighbor' to check in Vapousynth preview. No clue what you used, but I suspect it might the cause of the problem.


Looking at the debug output:

clip = core.std.CropRel(clip=clip, left=4, right=10, top=2, bottom=6)# cropping to 706x568
# removing grain using TemporalDegrain2
clip = G41Fun.TemporalDegrain2(clip=clip, degrainPlane=4, meAlgPar=False, postFFT=0, fftThreads=1)
# letterboxing 706x568 to 720x842
clip = core.std.AddBorders(clip=clip, left=4, right=10, top=2, bottom=6)

and

clip = core.std.CropRel(clip=clip, left=2, right=10, top=2, bottom=6)# cropping to 708x568
# removing grain using TemporalDegrain2
clip = G41Fun.TemporalDegrain2(clip=clip, degrainPlane=4, meAlgPar=False, postFFT=0, fftThreads=1)
# letterboxing 708x568 to 720x842
clip = core.std.AddBorders(clip=clip, left=2, right=10, top=2, bottom=6)

seem like correct values, but the comment in the letterbox seems wrong.

Also: Please do not pack everything in one debug output.

Cu Selur