With a YUV
A clip, IsY() and IsYUV() seem to return false. Is that intended behaviour? I've been relying on
https://forum.doom9.org/showthread.php?p=1783714 as a reference on colour spaces, but it's not clear on this point.
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Also that page makes reference to ComponentCount but the latest avisynth.h only seems to have NumComponents...? Is the latter the eventual form of the former, I guess?
If anybody ever thinks of it, HasY(), HasU(), HasG(), HasA() etc would be awesome...