Stream Buffer crashes in qdv.dll Win7 - c++

Question

I have this code for streaming to/from a stream buffer. I've left all error checking out to make the code easier to read and see what I'm doing.
ICaptureGraphBuilder2* pCaptureGraphBuilder = nullptr;
IGraphBuilder* pGraphCapture = nullptr;
IMediaControl* pControlCapture = nullptr;
IGraphBuilder* pGraphStream = nullptr;
IMediaControl* pControlStream = nullptr;
IBaseFilter* pFilterVideoIn = nullptr;
IBaseFilter* pFilterDVEncode = nullptr;
IBaseFilter* pFilterBufferCapture = nullptr;
IBaseFilter* pFilterBufferStream = nullptr;
// streams
IStreamBufferSink2* pBufferCapture = nullptr;
IStreamBufferSource* pBufferStream = nullptr;
// This sets up the streaming capture
HRESULT hr = CoCreateInstance(CLSID_CaptureGraphBuilder2,nullptr,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&pCaptureGraphBuilder));
hr = CoCreateInstance(CLSID_FilterGraph,nullptr,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&pGraphCapture));
hr = pCaptureGraphBuilder->SetFiltergraph(pGraphCapture);
hr = pGraphCapture->QueryInterface(IID_IMediaControl,(VOID**)&pControlCapture);
hr = EnumClassForFilterName(CLSID_VideoInputDeviceCategory,TEXT_CAPTUREDEVICE,&pFilterVideoIn); // This functions creates an instance of the capture device
hr = pGraphCapture->AddFilter(pFilterVideoIn,L"VideoIn");
hr = CoCreateInstance(CLSID_DVVideoEnc,nullptr,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&pFilterDVEncode));
hr = pGraphCapture->AddFilter(pFilterDVEncode,L"DVEncoder");
hr = CoCreateInstance(CLSID_StreamBufferSink,nullptr,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&pBufferCapture));
hr = pBufferCapture->QueryInterface(IID_PPV_ARGS(&pFilterBufferCapture));
hr = pGraphCapture->AddFilter(pFilterBufferCapture,L"BufferSink");
hr = pCaptureGraphBuilder->RenderStream(&PIN_CATEGORY_CAPTURE,&MEDIATYPE_Video,pFilterVideoIn,pFilterDVEncode,pFilterBufferCapture);
hr = pBufferCapture->LockProfile(L"C:\\save.tmp");
// now work on the stream in
hr = CoCreateInstance(CLSID_FilterGraph,nullptr,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&pGraphStream));
hr = pGraphStream->QueryInterface(IID_IMediaControl,(VOID**)&pControlStream);
hr = CoCreateInstance(CLSID_StreamBufferSource,nullptr,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&pBufferStream));
hr = pBufferStream->QueryInterface(IID_PPV_ARGS(&pFilterBufferStream));
hr = pGraphStream->AddFilter(pFilterBufferStream,L"StreamBufferSource");
hr = pBufferStream->SetStreamSink(pBufferCapture);
IEnumPins* pEnumPins = nullptr;
IPin* pPin = nullptr;
hr = pFilterBufferStream->EnumPins(&pEnumPins);
while(pEnumPins->Next(1,&pPin,nullptr) == S_OK){
hr = pGraphStream->Render(pPin);
pPin->Release();
}
// Which filters are really in the graph
// capture graph
OutputDebugString(L"-----------------------\n");
OutputDebugString(L"StreamIn Graph Filters\n");
OutputDebugString(L"\n");
IEnumFilters* pFilterEnum = nullptr;
IBaseFilter* pFilter = nullptr;
WCHAR name[256] = {0};
hr = pGraphCapture->EnumFilters(&pFilterEnum);
while(pFilterEnum->Next(1,&pFilter,nullptr) == S_OK){
FILTER_INFO fi={0};
pFilter->QueryFilterInfo(&fi);
StringCchPrintf(name,255,L"%s\n",fi.achName);
OutputDebugString(name);
fi.pGraph->Release();
pFilter->Release();
}
OutputDebugString(L"-----------------------\n");
// stream graph
OutputDebugString(L"-----------------------\n");
OutputDebugString(L"StreamSource Graph Filters\n");
OutputDebugString(L"\n");
pFilterEnum = nullptr;
pFilter = nullptr;
hr = pGraphStream->EnumFilters(&pFilterEnum);
while(pFilterEnum->Next(1,&pFilter,nullptr) == S_OK){
FILTER_INFO fi={0};
pFilter->QueryFilterInfo(&fi);
WCHAR name[256]={0};
StringCchPrintf(name,256,L"%s\n",fi.achName);
OutputDebugString(name);
fi.pGraph->Release();
pFilter->Release();
}
OutputDebugString(L"-----------------------\n");
hr = pControlCapture->Run();
hr = pControlStream->Run();
[SNIP]
and it crashes as soon as the 2nd graph starts to run with
First-chance exception at 0x000007fef3ce42e0 (qdv.dll) in StreamBuffer.exe: 0xC0000005: Access violation reading location 0x00000000000001c5.
Unhandled exception at 0x000007fef3ce42e0 (qdv.dll) in StreamBuffer.exe: 0xC0000005: Access violation reading location 0x00000000000001c5.
Which is telling me that something is not happy inside qdv.dll. So I downloaded the debug symbols to help diagnose whats really happening.
In the call stack I get
qdv.dll!CDVVideoCodec::Receive() + 0x220 bytes
qdv.dll!CTransformInputPin::Receive() + 0x4c bytes
qdv.dll!CBaseInputPin::ReceiveMultiple() + 0x49 bytes
sbe.dll!COutputQueue::ThreadProc() + 0xca bytes
sbe.dll!COutputQueue::InitialThreadProc() + 0x1c bytes
kernel32.dll!BaseThreadInitThunk() + 0xd bytes
ntdll.dll!RtlUserThreadStart() + 0x21 bytes
This tells me that perhaps I haven't supplied enough information in one of the graphs for DVEncoder. I've tried various settings for the codec but nothing works and I get the same crash in the same place with the same error.
All help is appreciated.