Exception:
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)).
My Graph:
Custom File Source (Async.) -> GDCL Mpeg-4 Demultiplexor -> ffdshow Video Decoder -> Video Renderer
My graph builds and plays correctly on an Administrator account. However when on a "Standard User" account it throws an exception on casting the FFDShow filter.
Code:
IBaseFilter pffdshowVideoDecoder = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_ffdshowVideoDecoder));
Creating the instance does not throw an exception, only when i attempt to cast it under Standard User account.
Additional Info:
- My program is set to STAThread
- The creation and casting of the object is on my Main thread
