In your dxdiag.txt:
------------------
DirectShow Filters
------------------
...
ffdshow Video Decoder,0xff800001,2,1,ffdshow.ax,1.00.0007.3198
...
ffdshow DXVA Video Decoder,0xff800002,2,1,ffdshow.ax,1.00.0007.3198
ffdshow raw video filter,0x00200000,2,1,ffdshow.ax,1.00.0007.3198
...