This is a late comment, but the Microsoft documentation states that you can get the VMR9Config and VMR9AplhaBitmap interfaces by calling IDVDGraphBuilder:GetDVDInterface() IE: hr = dvdGraph.GetDvdInterface(typeof(IVMRFilterConfig9).GUID, out comobj); and hr = dvdGraph.GetDvdInterface(typeof(IVMRMixerBitmap9).GUID, out comobj); You do this before you call the RenderDVDAudioVideo and the graph understands that you want to use the VMR. Past that, you should be able to follow the VMR samples. I think that the only thing that you really need is to get the MixerBitmap interface and then you can send an Alpha bitmap from a mem dc anytime that you want. I could be incorrect on that. Myself, I am getting an hr = 1 on RenderDVDAudioVideo. Is strange, as I can manually build the graph I want. MB

Here is a further update on what I have done: I have a question about ParentIdPrefix. I am down at the device level for USB devices and I found the DriverKeyName by first setting up a SP_DEVINFO_DATA da = new SP_DEVINFO_DATA() structure and then calling SetupDiEnumDeviceInfo(h,i,ref da) and then using SetupDiGetDeviceRegistryProperty with SPDRP_DRIVER. Now I want to access the ParentIdPrefix at that level and compare it to the ParentIdPrefix I extract from the Interfaces ID string provided by DirectSound. In my code in which I have used the example from USBView to get to the USB Device level. I tried to get the ParentIdPrefix by using CM_Get_Parent with the da.DevInst value I have. The value I received (3042) does not represent the ParentIdPrefix value (string) (7&f4e88d5&0) I can see in the registry. I would like to get the value I see in the registry. Do you know how I would go about this? Thanks in advance for your help. GrizMan

I found another way to approach it. It's a bit of a hack, but for now to get the Interface ID using C# from my application, I can modify the DirectSoundEnumerator C++ application to remove the GUI and get rid of the dialog. Once that is done, I can run the C++ application as a process in C# and have it write the Description and Interface ID data to a file. I can then read the data from the file to get the Interface ID associated with the device and map that to the unique devices I access in my application. Like I said, it's kind of a hack, but until I find a better way to do it with C#, it will get the job done. I'm going to call this a general message type and not the answer yet because it is a hack and maybe there is a better way to do this. GrizMan

The messages are sent to the trackbar control's parent by default. You could right click the parent window class in the class view window, choose properties, select the messages tab in the properties window, and add the WM_VSCROLL handler there. Mark Mark Salsbery Microsoft MVP - Visual C++ :java:

Try the following. I marked the changes I made with "jl - " so you can what was causing the problems. Also, the reason you're not able to connect to the remote graph in GraphEdit is most likely because you have the wrong version for Vista. I explain why this is, in the article http://www.codeproject.com/cs/media/dsgraphedit.asp [^] in the section "Known Issues". Hope this helps. void Convert2Wav() { IPin mp3\_file\_sourceOut = null; IPin mpg\_stream\_splitterIn = null, mpg\_stream\_splitterOut = null; IPin dshow\_audio\_decoderIn = null, dshow\_audio\_decoderOut = null; IPin infinitePinTeeFilterIn = null, infinitePinTeeFilterOut1 = null; IPin infinitePinTeeFilterOut2 = null, infinitePinTeeFilterOut3 = null; // Output Devices IPin logitech\_earphone\_headsetIn = null; IPin logitech3\_earphone\_headsetIn = null; IPin sigmatel\_speakers\_headsetIn = null; try { string fileName = fName; // jl - you already created the GraphBuilder in InitInterfaces /\* Guid filter\_graph\_guid = new Guid("E436EBB8-524F-11CE-9F53-0020AF0BA770"); Type t = Type.GetTypeFromCLSID(filter\_graph\_guid); gb = (IGraphBuilder)Activator.CreateInstance(t); \*/ // jl - this will create a file source filter, but it wont actually point to a file /\* Guid file\_source\_guid = new Guid("E436EBB5-524F-11CE-9F53-0020AF0BA770"); Type file\_source\_type = Type.GetTypeFromCLSID(file\_source\_guid); mp3\_file\_source = (IBaseFilter)Activator.CreateInstance(file\_source\_type); hr = gb.AddFilter((IBaseFilter)mp3\_file\_source, fileName); mp3\_file\_source.FindPin("Output", out mp3\_file\_sourceOut); DsError.ThrowExceptionForHR(hr); \*/ // jl - do this instead of the above to add a source filter hr = gb.AddSourceFilter(fName + fExt, fName, out mp3\_file\_source); DsError.ThrowExceptionForHR(hr); mp3\_file\_source.FindPin("Output", out mp3\_file\_sourceOut); Guid splitter\_guid = ne