I've never messed with vapoursynth. Not sure of the learning curve of it vs. avisynth. Maybe I'll take a look at it later.
However, I suspect I'm missing the forest for the trees getting lost in the minutia here. The less than idea PNSR result doesn't mean mean it looks bad or has visible artifacts. I didn't do a super exhaustive comparison, but in my quick look at a few frames, I couldn't see any quickly apparent difference in the before and after frame despite the sub 50dB PNSR of the worst spots (using uncompressed video formats).
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