Unable to cast COM object of type 'System.__ComObject' to interface type 'DirectShowLib.IBaseFilter'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{56A86895-0AD4-11CE-B03A-0020AF0BA770}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

IBaseFilter pffdshowVideoDecoder = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_ffdshowVideoDecoder));