nev, since native dxva has been implemented, so would you like to use "DXVA" FourCC for NV12 subtype as what CoreAVC 3.0.1 has done.
http://corecodec.com/products/coreavc/changelog
Quote:
Use "DXVA" FourCC for NV12 subtype when it's used for DXVA connections
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http://i.imgur.com/KFJJR.png