hr = pCaptureGraphs[i]->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video, pSourceFilters[i], pGrabberFilters[i], pNullRendFilters[i]);

class __declspec(uuid("{04FE9017-F873-410E-871E-AB91661A4EF7}")) FfdshowVideoDecoder;
CComPtr<IBaseFilter> pBaseFilter;
HRESULT nResult = pBaseFilter.CoCreateInstance(__uuidof(FfdshowVideoDecoder));