Not able to play recorded video(avi) file

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C++

directshow

I am using direct show to record avi file using the following filters:
FileSource(Async)->AviSpliter->AviMux ->FileWriter
I am pasting relevant source code here:

 hr = CoInitialize(NULL);
	 if(FAILED(hr))
	 {
	   GetErrorMessage(hr);
	 }
	  hr = CoCreateInstance(CLSID_CaptureGraphBuilder2,NULL,CLSCTX_INPROC_SERVER,IID_ICaptureGraphBuilder2,(void**)&pCapture);
	 if(FAILED(hr))
	 {
		 GetErrorMessage(hr);
	 }
	 hr = CoCreateInstance(CLSID_FilterGraph,NULL,CLSCTX_INPROC_SERVER,IID_IGraphBuilder,(void**)&pGraph);
     if(FAILED(hr))
	 {
		 GetErrorMessage(hr);
	 }
	hr = pGraph->QueryInterface(IID_IMediaControl,(void**)&pControl);
	if(FAILED(hr))
	{
		GetErrorMessage(hr);
	}
    hr = pGraph->QueryInterface(IID_IMediaEventEx,(void**)&pEventx);
	if(FAILED(hr))
	{
		GetErrorMessage(hr);
	}
	 pCapture->SetFiltergraph(pGraph);
	 if(FAILED(hr))
	 {
		  GetErrorMessage(hr);
	 }
	 hr = CoCreateInstance(CLSID_AviSplitter,NULL,CLSCTX_INPROC_SERVER,IID_IBaseFilter,(void**)&pAviSpliter);  
	if(FAILED(hr))
	{
		GetErrorMessage(hr);
	}
    hr = CoCreateInstance(CLSID_AviDest,NULL,CLSCTX_INPROC_SERVER,IID_IPersistMediaPropertyBag,(void**)&pBag);
	if(FAILED(hr))
	{
		GetErrorMessage(hr);
	}
	hr = pBag->QueryInterface(IID_IBaseFilter,(void**)&pAviMux);
	if(FAILED(hr))
	{
		GetErrorMessage(hr);
	}

	hr = CoCreateInstance(CLSID_FileWriter,NULL,CLSCTX_INPROC_SERVER,IID_IFileSinkFilter2,(void**)&pSink);
	if(FAILED(hr))
	{
		GetErrorMessage(hr);
	}
	hr = pSink->QueryInterface(IID_IBaseFilter,(void**)&pFileWriter);
	if(FAILED(hr))
	{
		GetErrorMessage(hr);
	}
	hr = pSink->SetFileName(m_SaveFile.AllocSysString(),NULL); 
	if(FAILED(hr))
	{
		GetErrorMessage(hr);

	}
	hr = pGraph->AddFilter((IBaseFilter*)pFileWriter,L"FileWriter");
	if(FAILED(hr))
	{
		AfxMessageBox(L"unable to Add");
		return FALSE;
	}
    hr = pGraph->AddFilter((IBaseFilter*)pAviMux,L"AviDest");
	if(FAILED(hr))
	{
		GetErrorMessage(hr);
	}
	hr = CoCreateInstance(CLSID_MediaPropertyBag,NULL,CLSCTX_INPROC_SERVER,IID_IMediaPropertyBag,(void**)&pPropBag);
	pBag->Load(pPropBag,NULL);
	hr = pGraph->AddFilter(pAviSpliter,L"AviSplitter");
	if(FAILED(hr))
	{
		GetErrorMessage(hr);
	}
	
  
    pGraph->RenderFile(m_StrmUrl.AllocSysString(),NULL);
	if(FAILED(hr))
	{
		GetErrorMessage(hr);
	}
  pEventx->SetNotifyWindow((OAHWND)GetSafeHwnd(), WM_GRAPH_NOTIFY, 0);
  pControl->Run();
  return TRUE;	
}
BOOL CRecordingDlg::GetErrorMessage(HRESULT hr)
{
	           switch(hr)
               {
			   case S_OK:
			   break;
			   case S_FALSE:
			   AfxMessageBox(L"Comlibrary Already Initialized in this thread");
			   break;
			   case VFW_S_PARTIAL_RENDER:
			   AfxMessageBox(L"VFW_S_PARTIAL_RENDER");
			   break;
			   case E_ABORT:
			   AfxMessageBox(L"E_ABORT");
			   break;
			   case E_POINTER:
			   AfxMessageBox(L"E_POINTER");
			   break;
			   case VFW_E_CANNOT_CONNECT:
			   AfxMessageBox(L"VFW_E_CANNOT_CONNECT");
		       break;
			   case VFW_E_NOT_IN_GRAPH:
			   AfxMessageBox(L"VFW_E_NOT_IN_GRAPH");
			   break;
			   case E_UNEXPECTED:
			   AfxMessageBox(L"The two initialization methods are mutually exclusive");
			   break;

	           }

	return TRUE;

Recording done successfully. File is also created without any error, but I am not able to play the file, error from WMP, is: not supported format.
plz help me thank in advanced.