Recently came across the YV12<->YUY2 conversion issue described here: http://avisynth.nl/index.php/Known_Issues
But trying the suggested replacement throws a "no function named YUY2toYV12i" error.
The cause of which is pretty obvious if you look at the script: the support functions only run in the opposite direction. What's supposed to be in the other two?
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It does not really exhibit the accumulation issue going the other way , and you will only see the effect after multiple conversions
The chroma shift problem only occurs going the other way (interlaced YV12->YUY2).
The other support functions are in the original post