weird webcam capture problem

I have an application that is behaving strangely. My application
captures video to a wmv file from a web cam. I have one user that
records wmv files that are black with no sound. You can see a filter
graph from this problem cam here
http://www.bowerstechnologies.com/problem.grf.

Here is the code that created that filter graph. Can you have a look
at this code and let me know if you see any problems that could be
causing this behavior? Thanks all,

David K. Bowers

HRESULT CCaptureGraph::RenderWmvCapture(const TCHAR* szFileName, int
cchFileName,
const TCHAR* szProfileFile, WCHAR* pwszAuthor,
WCHAR* pwszTitle, WCHAR* pwszRating,
WCHAR* pwszDescription, WCHAR* pwszCopyright)
{
if(m_bUseLog){
LogText("\r\nEntering CCaptureGraph::RenderWmvCapture()\r\n");
}

OutputDebugString(TEXT("RenderWmvCapture()\n"));

if (!m_pCap) return E_FAIL;
m_pControl->Stop();

HRESULT hr;
CComPtr<IBaseFilter> pMux;

// Build the Mux -> File Writer part of the graph.

// I'm using TCHAR strings for input but the API wants wide char
only

#ifdef _UNICODE
hr = m_pBuild->SetOutputFileName(&MEDIASUBTYPE_Asf, szFileName, &pMux,
0);
#else
WCHAR *wszFileName = NULL;
int i = AnsiToWide(szFileName, cchFileName + 1, &wszFileName);
if (!wszFileName)
{
return E_FAIL;
}

hr = m_pBuild->SetOutputFileName(&MEDIASUBTYPE_Asf, wszFileName,
&pMux, 0);
if(m_bUseLog){
char text[500];
sprintf(text, "SetOutputFileName returned %d for file name %s\r\n",
hr, wszFileName);
LogText(text);
}

delete [] wszFileName;
#endif

if (FAILED(hr))
{
return hr;
}

// Now configure the ASF Writer
// Present the property pages for this filter
//hr = ShowWmvFilterPropertyPages(pMux);

// newstuff begin
IConfigAsfWriter *pConfig = 0;
hr = pMux->QueryInterface(IID_IConfigAsfWriter, (void**)&pConfig);
if(m_bUseLog){
char text[500];
sprintf(text, "pMux->QueryInterface(IID_IConfigAsfWriter returned
%d\r\n", hr);
LogText(text);
}

if (SUCCEEDED(hr))
{
// Configure the ASF Writer filter.
// Configure the filter with the profile
CComPtr<IWMProfile> pProfile1;
BOOL fZeroSizedVidRect = FALSE;

// Load the data in the prx file into a WMProfile object
_TCHAR szProfile[_MAX_PATH] = {'\0'};
_tcscpy(szProfile, szProfileFile);
hr = LoadCustomProfile((LPCSTR)szProfile, &pProfile1,
/*out*/fZeroSizedVidRect);
if(m_bUseLog){
char text[500];
sprintf(text, "LoadCustomProfile returned %d for profile %s\r\n",
hr, szProfile);
LogText(text);
}

if(FAILED(hr))
{
//DbgLog((LOG_TRACE, 3, _T("Failed to load profile! hr=0x%x\n"),
hr));
return hr;
}

if(fZeroSizedVidRect)
{
//OutputMsg(_T("The profile has a zero-sized rectangle. This will be
interpreted as an instruction to use the native video size.\r\n"));
//DbgLog((LOG_TRACE, 3, _T("Zero-sized rectangle!\n")));

// Now we need to insert some dummy values for the output rectangle
in order to avoid an
// unhandled exception when we first configure the filter with this
profile.
// Later, after we connect the filter, we will be able to determine
the upstream rectangle size, and
// then adjust profile's rectangle values to match it.

hr = SetNativeVideoSize(pMux, pProfile1, TRUE);
if(m_bUseLog){
char text[500];
sprintf(text, "SetNativeVideoSize returned %d\r\n", hr);
LogText(text);
}

if(FAILED(hr))
{
//DbgLog((LOG_TRACE, 3, _T("Failed to SetNativeVideoSize with dummy
values! hr=0x%x\n"), hr));
return hr;
}
}

hr = pConfig->ConfigureFilterUsingProfile(pProfile1);
if(m_bUseLog){
char text[500];
sprintf(text, "ConfigureFilterUsingProfile returned %d\r\n", hr);
LogText(text);
}

if(FAILED(hr))
{
//DbgLog((LOG_TRACE, 3, _T("Failed to configure filter to use
profile1! hr=0x%08x\n"), hr));
return hr;
}

pConfig->Release();
}
else
return hr;

// newstuff end

bool bDVDevice = IsDVDevice(m_pCap);
if(m_bUseLog){
char text[500];
sprintf(text, "IsDVDevice returned %d\r\n", bDVDevice);
LogText(text);
}

if(bDVDevice)
hr = HookUpFiltersDV(pMux);
else
hr = HookUpFiltersCam(pMux);

/*
// Now add the video capture to the output file
hr = m_pBuild->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video,
m_pCap, NULL, pMux);

if (FAILED(hr))
return hr;

// And do the same for the audio
hr = m_pBuild->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Audio,
m_pAudioCap, NULL, pMux);
*/
if (FAILED(hr))
{
// Abject failure. Try to recover the preview, at least.
TearDownGraph();
//RenderPreview();
return hr;
}

// add the metadata to the wmv file
hr = AddWmvMetadata(pMux, pwszAuthor, pwszTitle, pwszRating,
pwszDescription, pwszCopyright);
if(m_bUseLog){
char text[500];
sprintf(text, "AddWmvMetadata returned %d\r\n", hr);
LogText(text);
}

if (FAILED(hr))
return hr;

hr = StopCapture(); // Don't capture now, but get ready to do so.
if(m_bUseLog){
char text[500];
sprintf(text, "StopCapture returned %d\r\n", hr);
LogText(text);
}

if (FAILED(hr))
return hr;

hr = m_pControl->Run();
if(m_bUseLog){
char text[500];
sprintf(text, "Run returned %d\r\n", hr);
LogText(text);
}

if (FAILED(hr))
return hr;

// Then start the capture stream.
hr = StartCapture();

if(m_bUseLog){
LogText("Leaving CCaptureGraph::RenderWmvCapture()\r\n");
}

return hr;
}

HRESULT CCaptureGraph::HookUpFiltersCam(IBaseFilter* pWmvMux)
{
if(m_bUseLog){
char* msg = "Entering CCaptureGraph::HookUpFiltersCam\0";
LogText(msg);
}

//HRESULT hr = m_pBuild->RenderStream(&PIN_CATEGORY_PREVIEW,
&MEDIATYPE_Video,
// m_pCap, 0, pWmvMux);
HRESULT hr = m_pBuild->RenderStream(&PIN_CATEGORY_PREVIEW,
&MEDIATYPE_Video,
m_pCap, 0, 0);

if(m_bUseLog){
char text[500];
sprintf(text, "RenderStream(&PIN_CATEGORY_PREVIEW returned %d\r\n",
hr);
LogText(text);
}

// Now add the video capture to the output file
hr = m_pBuild->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video,
m_pCap, 0, pWmvMux);
if(m_bUseLog){
char text[500];
sprintf(text, "RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video
returned %d\r\n", hr);
LogText(text);
}

if(FAILED(hr)) return hr;

hr = m_pBuild->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Audio,
m_pAudioCap, 0, pWmvMux);
if(m_bUseLog){
char text[500];
sprintf(text, "RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Audio
returned %d\r\n", hr);
LogText(text);
}
if(m_bUseLog){
char* msg = "Leaving CCaptureGraph::HookUpFiltersCam\0";
LogText(msg);
}

return hr;
}

.

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