c# - IVMRMixerControl9 not implemented on Video Mixing Renderer 9 -


i trying extract ivmrmixercontrol9 video mixing renderer 9, com based direct show filter doesn't list interface implemented, , can't queryinterface it. trying set enable "yuv mixing mode", presumably using ivmrmixercontrol9::setmixingprefs method.

why msdn documentation list vmr9 implementing ivmrmixercontrol9, can't extract interface? have checked on windows xp , windows 7, no luck.

var vmr9 = new videomixingrenderer9() ibasefilter; // null. c# equivalent of queryinterface var mixercontrol = vmr9 ivmrmixercontrol9;

here image of setting trying enable.

pixture of setting trying enable

too early, mixer loaded on demand. or, can force explicit setnumberofstreams call.

        ibasefilter basefilter = new videomixingrenderer9() ibasefilter;         ivmrfilterconfig9 vmrfilterconfig = basefilter ivmrfilterconfig9;         vmrfilterconfig.setnumberofstreams(1);         ivmrmixercontrol9 vmrmixercontrol = basefilter ivmrmixercontrol9;         debug.assert(vmrmixercontrol != null);

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