[WorBry]

Originally Posted by age

The conversion of that script should be :

c = core.fmtc.resample (clip=c, css="444",kernel="point")                   #ConvertToYV24(chromaresample="point", interlaced=false)

                                                                              
r=core.fmtc.resample (clip=c,kernel="point",sw=0, sh=-1)                    #MergeChroma(PointResize(width, height, 0, 1))
c=core.std.ShufflePlanes(clips=[c,r], planes=[0, 1, 2], colorfamily=vs.YUV) #


c = core.fmtc.matrix (clip=c, mat="709", col_fam=vs.RGB)                    #ConvertToRGB32(matrix="rec709", interlaced=false)


c = core.fmtc.matrix (clip=c, mat="709", col_fam=vs.YUV)                    #
c = core.fmtc.resample (clip=c, css="420",kernel="point")                   #ConvertToYV12(chromaresample="point", interlaced=false)
c = core.fmtc.bitdepth(clip =c, bits=8)                                     #

For compressing full scale YV12 sources using expr:

bit=2**c.format.bits_per_sample-1         
c=core.std.Expr(clips=c, expr=[" {bit} x {bit} / 0.85882352941 * 1 / 0.06274509803 + * ".format(bit=bit),"  {bit} x {bit} / 0.50196078431 - 0.87843137254 * 1 / 0.50196078431 + * ".format(bit=bit),"  {bit} x {bit} / 0.50196078431 - 0.87843137254 * 1 / 0.50196078431 + * ".format(bit=bit)])

Brilliant. Thanks for that.