Since you posted in the h.264 section I assume you use a h.264 codec and decode it with ffdshow, since afaik all h.264 encoders that are normally used only use Yv12 internally and a lot of graphic cards output RGB there needs to be a conversion somewhere from Yv12 to RGB.
If you like you stated "get RGB from the gfx card that i will convert to YV12" this has nothing to do with the "high quality YV12 to RGB conversion in ffdshow".
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