Why don't you just use Vdubmod "Direct Stream Copy"? The output of Avisynth will then be YV12. No need to use the YV12 compressor at all.
And you are right: in Full Processing Mode, Vdubmod will convert YV12 to RGB and feed that to the YV12 compressor, which will then convert RGB back to YV12. This is not lossless. So use Direct Stream Copy; and you don't need the YV12 compressor...
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