FernetMenta/xbmc — comment on commit 8024d4cf3c995fa820fa30b2a020838f7dbdb9fa
File: lib/ffmpeg/libavcodec/xvba_vc1.c line 71
By FernetMenta:

I have not looked into the vaapi code, it might be done before handing over to xvba backend. check out dxva2_vc1