heyer
SVP calculates new frames by Avisynth-script using avisynth SVP libraries.
Avisynth has restriction of color depth. It is 8 bit depth. Avisynth SVP libraries has restriction of color space. It is YV12.
ffdShow used by SVP to get videoframes on-the-fly and to pass it to the avisynth-script. At the avisynth-script input must be YV12 color-space. If not it is converted to YV12 (8 bit depth).