Colorspace conversion - processing speed?

[tin3tin]

Does anyone know if the colorspace conversion commands checks if a clip actually is in a different colorspace before working on the conversion?

What I mean is there a processing speed difference between doing this:
converttoyv12()
And this:
isyv12()? last : converttoyv12()

[Dark Shikari]

Yes, AFAIK converttoyv12() is a no-op on yv12 clips.

[Guest]

Reading documentation is apparently a dead art. From the Avisynth documentation for the conversion filters:

"If the video is already in the specified format, it will be passed through unchanged."

[tin3tin]

@ Sorry - I must have overlooked it. Thanks. :)