Well I am pretty sure now after asking some people (Blight included) that MPEG 2 is encoded using YV12. I wonder can things like ffdshow sharpening etc, be done better when it is in YUY2 mode. I can't imagine why it would but as a perfectinist I want to be sure this is right.
WinDVDs filters output in YUY2 mode by default. They can be forced to use YV12 in ZP I think with ffdshow. In player mode I have a tweak (in WinDVD Tweaker) to use YV12 by default.
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