I am trying to understand why wont the source filter connect with VMR9?

mediaController.InsertSourceFilter(sinkFilter, m_pRenderGraph, out sourceFilter);
                                               var vmr = new VideoMixingRenderer9();
                                               m_pRenderGraph.AddFilter(vmr as IBaseFilter, "VMR");

                                               IBaseFilter vmrBase = FilterGraphTools.FindFilterByClsid(m_pRenderGraph, Clsid.VideoMixingRenderer9);
                                               IVMRFilterConfig9 xd = vmrBase as IVMRFilterConfig9;
                                               if (xd != null)
                                               {
                                                               int status = xd.SetRenderingMode(VMR9Mode.Windowless);
                                               }

                                               FilterGraphTools.ConnectFilters(m_pRenderGraph, sourceFilter, vmrBase, true);
                                               mediaController.BridgeGraphs(sinkFilter, sourceFilter);

Without going into too much detail:

• Line „ConnectFilters“ fails because no intermediate filters are found to make that connection work.
• When trying to debug, I can clearly see that Source filter is not spitting out anything useful. (It’s like that the sink<-->source transfer never works), so that’s why it wont connect.
• However, when I get source filter „Output 1“ pin, and then use myGraph.Render(source_output_pin), it works. Data is being sent from sink to source and everything connects automatically. However the problem is that the wrong VMR is inserted there. It’s VMR Renderer. I would like to have VMR9, that’s why im doing it. Why wont it work with VMR9 and why does source filter not show correct media type.

Thank you.