VS preview error with smdegrain refine motion, block & overlap size, and color format

[Selur]

YUV410p8, YUV411p8: always error

I assume you mean: YUV420P8, YUV422P8, since that is what your script uses.
Seems like I need to add some padding when mvutensils is used.
As a workaround you can set SMDegrain->Tools->MV to MV.
From what I can see, this is not a bug, but a limitation of mvutensils which I was not aware of.

=> I'll look at it tomorrow and think of a general workaround. (my guess is that this might also happen in some other filters)

Cu Selur