Problem with compression of a DirectShow video filter

Hi all, I'm having problems in setting compression parameters for a directshow video filter for a video and audio grabbed from a usb webcam.

The code I am using (adapted from various websites on the internet) is the following (removed error checking to improve readability):

Code:

//... various code before hr=m_pGraph->AddFilter(m_pVidDeviceFilter,L"Vid Capture Filter"); hr=m_pGraph->AddFilter(m_pAudDeviceFilter,L"Aud Capture Filter"); hr = CoCreateInstance(CLSID_WMAsfWriter,NULL,CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **) &m_pWMASFWritter); //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! // !!! Try to add compression from now on !!!! DWORD dwBitRate = 2670000; // I tried almost everything here DWORD dwQuality = 50; // in range[0-100] DWORD dwSecPerKey = 5000; // Initialize a new Profile Manager IWMProfileManager* pIPM = 0; WMCreateProfileManager(&pIPM); // Create a new empty profile IWMProfile* pIProf = 0; pIPM->CreateEmptyProfile(WMT_VER_9_0,&pIProf); pIProf->SetName(L"Window Media Video 9 Profile"); pIProf->SetDescription (L"Window Media Video 9 Custom Encoding"); // Create a new video stream IWMStreamConfig* pVideoStream = 0; pIProf->CreateNewStream(WMMEDIATYPE_Video,&pVideoStream); pVideoStream->SetStreamName(L"videostream");; pVideoStream->SetConnectionName(L"video"); pVideoStream->SetBitrate(662144); // This causes problems pVideoStream->SetBufferWindow(3000); pVideoStream->SetStreamNumber(1); IWMVideoMediaProps* pVideoMediaProps = 0; // Get this Interface from pVideoStream... hr = pVideoStream->QueryInterface(IID_IWMMediaProps, (void**)&pVideoMediaProps); WM_MEDIA_TYPE sMediaType; WMVIDEOINFOHEADER sVideoInfoHeader; memset(&sMediaType, 0, sizeof(sMediaType)); sMediaType.majortype = WMMEDIATYPE_Video; sMediaType.subtype = WMMEDIASUBTYPE_MPEG2_VIDEO; sMediaType.bFixedSizeSamples = FALSE; sMediaType.bTemporalCompression = TRUE; sMediaType.formattype = WMFORMAT_VideoInfo; sMediaType.cbFormat = sizeof(WMVIDEOINFOHEADER); sMediaType.pbFormat = (BYTE *)&sVideoInfoHeader; // Setup the Video Info Header memset(&sVideoInfoHeader, 0, sizeof(sVideoInfoHeader)); sVideoInfoHeader.rcSource.left = 0; sVideoInfoHeader.rcSource.top = 0; sVideoInfoHeader.rcSource.right = 352; sVideoInfoHeader.rcSource.bottom = 240; sVideoInfoHeader.rcTarget.left = 0; sVideoInfoHeader.rcTarget.top = 0; sVideoInfoHeader.rcTarget.right = 352; sVideoInfoHeader.rcTarget.bottom = 240; sVideoInfoHeader.dwBitRate = 262144; sVideoInfoHeader.AvgTimePerFrame = 333667; // (1/29.97) in 100-ns units sVideoInfoHeader.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); sVideoInfoHeader.bmiHeader.biWidth = 352; sVideoInfoHeader.bmiHeader.biHeight = 240; sVideoInfoHeader.bmiHeader.biPlanes = 1; sVideoInfoHeader.bmiHeader.biBitCount = 24; sVideoInfoHeader.bmiHeader.biCompression = MAKEFOURCC(0xe4,0x36,0xeb,0x83); sVideoInfoHeader.bmiHeader.biSizeImage = 0; sVideoInfoHeader.bmiHeader.biXPelsPerMeter = 0; sVideoInfoHeader.bmiHeader.biYPelsPerMeter = 0; sVideoInfoHeader.bmiHeader.biClrUsed = 0; sVideoInfoHeader.bmiHeader.biClrImportant = 0; // Set the VideoMediaProps for this Stream pVideoMediaProps->SetMediaType(&sMediaType); // pVideoMediaProps->SetMaxKeyFrameSpacing(1000000); // pVideoMediaProps->SetQuality(100); pVideoMediaProps->Release(); hr = pIProf->AddStream(pVideoStream); ////// hr IS ALWAYS NS_E_INVALID_STREAM HERE!! PROBLEM! if (hr == NS_E_INVALID_STREAM) { // Here the problem! } // Set the profile for the writer CComQIPtr<IConfigAsfWriter2> pConfigWriter; pConfigWriter = m_pWMASFWritter; hr = pConfigWriter->SetParam(AM_CONFIGASFWRITER_PARAM_DONTCOMPRESS, FALSE, 0); hr = pConfigWriter->ConfigureFilterUsingProfile(pIProf); //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! // !!! End of compression code... continue with streaming/networking code.. !!! hr=m_pGraph->AddFilter(m_pWMASFWritter,L"ASF Writter"); hr = m_pWMASFWritter->QueryInterface( IID_IFileSinkFilter, (void**)&m_pFileSinkFilter ); hr = m_pFileSinkFilter->SetFileName(L"C:\\test.wmv", NULL); //.... etc....

Can someone point me in the right direction please?