So far as I know, MeGUI REQUIRES YV12 final colorspace to work at all, and if already in YV12, then ConvertToYV12 does nothing.
So, dont have a clue as to why encoding speed may be slow.
Quote:
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When the target format is the same as the source format, the original clip will be returned unchanged, except for the case of ConvertToYV12 where the ChromaInPlacement and ChromaOutPlacement parameters are different
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http://avisynth.nl/index.php/Convert
Again, suggest that you learn at least basic Avisynth scripting, then you might have more idea what is wrong when problems show up.
If you add eg
Code:
# some script stuff
...
#ConvertToYV12 # comment out for showing info, then remove when not showing info
Info
And set in options to "Show video preview after avisynth script selection", and see what Info shows you.
What is the colorspace shown by info ?