@WorBry - The vegas/natron/resolve15.1 histogram pattern in your screenshot looks very close to the "box" kernel using fmtc in vapoursynth
Code:
clip = core.lsmas.LibavSMASHSource(r'F:\checkers-444.mov')
clip = core.fmtc.resample(clip, css="422", kernel="box")
clip = core.fmtc.bitdepth(clip, bits=10, dmode=1)
clip.set_output()
1 frame video sample (zipped) for non vpy users
https://www.mediafire.com/file/td58t...e%3D1.zip/file
Not sure what the equivalent is in avisynth. I thought maybe avisynth dither tools (same author) could do it , but I can't get it to do it properly, it's csp for dither_resize16 only does 8bit formats like "YV16", not YUV422P10