求助，把现有视频文件保存成wmv文件格式，使用WM ASF Writer遇到问题。

Question

恳求各位大侠帮忙，本人初次接触到DirectShow就遇到问题，折腾了两天也没有弄好，求助各位好心人：
问题是这样的：我想把硬盘上现有的视频文件比如avi.mpg的文件重新保存成wmv格式的，参考了下书上和网上的例子写下了如下的代码，发现程序没有反应，恳请帮忙。。不胜感激。
CString strName;
GetDlgItem(IDC_EDIT1)->GetWindowText(strName);
pBuilder=NULL;
pGraph=NULL;
pMC=NULL;
HRESULT hr=NOERROR;
CoCreateInstance(CLSID_CaptureGraphBuilder2,NULL,
CLSCTX_INPROC_SERVER,
IID_ICaptureGraphBuilder2,
(void**)&pBuilder);
CoCreateInstance(CLSID_FilterGraph, NULL, 
CLSCTX_INPROC_SERVER, 
                    IID_IGraphBuilder, 
(void **)&pGraph);
pBuilder->SetFiltergraph(pGraph);
IBaseFilter *pSrc,*pASFWriter = 0; CoCreateInstance(CLSID_AsyncReader, NULL, CLSCTX_ALL, 
                     IID_IBaseFilter, (void **)&pSrc);
CoCreateInstance(CLSID_WMAsfWriter, NULL, CLSCTX_ALL, 
                     IID_IBaseFilter, (void **)&pASFWriter);
pGraph->AddFilter(pSrc,L"FileSource(Async.)");
pGraph->AddFilter(pASFWriter,L"WM ASF Writer");

pASFWriter->QueryInterface(IID_IFileSinkFilter2,(void**)&pSink);
pSink->SetFileName(strName.AllocSysString(),NULL);    IPin* pOutpin = FindPin(pSrc,PINDIR_OUTPUT);
IPin* pInpin= FindPin(pASFWriter,PINDIR_INPUT);
//连接滤波器的引脚
pGraph->ConnectDirect(pOutpin,pInpin,NULL);
pBuilder->RenderStream(
                              &PIN_CATEGORY_CAPTURE, // Capture pin.
                                 &MEDIATYPE_Video, // Video. Use MEDIATYPE_Audio for audio.
                               pSrc, // Pointer to the capture filter. 
                                    0, 
                                  pASFWriter); // Pointer to the sink filter (ASF Writer).

Answer 1

大侠们，帮帮忙吧，我把功能缩小了，只是把avi的转换成wmv的。代码如下，但是运行没有结果，调试时发现FinePin函数读取引脚时，读输入引脚可以，输出引脚不行，包括源filter，输出引脚也有问题，高人请帮忙看下吧。：
void CAvitowmvDlg::OnBnClickedButton1()
{
// TODO: 在此添加控件通知处理程序代码
CString strFilter=_T("AVI File (*.avi)|*.avi|");
        strFilter+="All File(*.*|*.*|";
CFileDialog dlg(TRUE,NULL,NULL,
                          OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
  strFilter,this);
if(dlg.DoModal()==IDOK)
{
CString strName=dlg.GetPathName();
strName+=".wmv";
this->m_edit=strName;
UpdateData(FALSE);
 Convert2Wmv(strName);
}
   
}
 void CAvitowmvDlg::Convert2Wmv(CString fileName)
 {
 pBuilder=NULL;
pGraph=NULL;
pMediaControl=NULL;
HRESULT hr=NOERROR; CoCreateInstance(CLSID_CaptureGraphBuilder2,NULL,
CLSCTX_INPROC_SERVER,
IID_ICaptureGraphBuilder2,
(void**)&pBuilder);
CoCreateInstance(CLSID_FilterGraph, NULL, 
CLSCTX_INPROC_SERVER, 
                    IID_IGraphBuilder, 
(void **)&pGraph);
pBuilder->SetFiltergraph(pGraph);  pGraph->QueryInterface(IID_IMediaControl,(void**)&pMediaControl);
 pGraph->RenderFile (fileName,NULL);  CoCreateInstance(CLSID_AsyncReader, NULL, CLSCTX_ALL, 
                     IID_IBaseFilter, (void **)&pSrc);
 pGraph->AddFilter(pSrc,L"FileSource(Async.)");

 CoCreateInstance(CLSID_AviSplitter, NULL, CLSCTX_ALL, 
                     IID_IBaseFilter, (void **)&pAviSplitter);
 pGraph->AddFilter(pAviSplitter,L"Avi Splitter");  CoCreateInstance(CLSID_WMAsfWriter, NULL, CLSCTX_ALL, 
                     IID_IBaseFilter, (void **)&pASFWriter);
 pGraph->AddFilter(pASFWriter,L"WM ASF Writer");

  pASFWriter->QueryInterface(IID_IFileSinkFilter, (void**) &pSink);
  hr=pSink->SetFileName(fileName.AllocSysString(), NULL);
  pSink->Release();   IPin* pOutpin1 = FindPin(pSrc,PINDIR_OUTPUT);
  IPin* pInpin1=FindPin(pAviSplitter,PINDIR_INPUT);
  pGraph->ConnectDirect(pOutpin1,pInpin1,NULL);
 
  IPin  *pVideoOut   =FindPin (pAviSplitter,PINDIR_OUTPUT);
  IPin  *pAideoOut   =FindPin (pAviSplitter,PINDIR_OUTPUT);
      
   IPin* pVideoInpin= FindPin(pASFWriter,PINDIR_INPUT);
   IPin* pAideoInpin= FindPin(pASFWriter,PINDIR_INPUT);   pGraph->ConnectDirect(pVideoOut,pVideoInpin,NULL);
  pGraph->ConnectDirect(pAideoOut,pAideoInpin,NULL);
 pMediaControl->Run ();
    
 }
 IPin  * CAvitowmvDlg::FindPin(IBaseFilter *pFilter, PIN_DIRECTION dir)
  {   
         IEnumPins* pEnumPins;
IPin* pOutpin;
PIN_DIRECTION pDir;
pFilter->EnumPins(&pEnumPins); while (pEnumPins->Next(1,&pOutpin,NULL)==S_OK)
{
pOutpin->QueryDirection(&pDir);
if (pDir==dir)
{
return pOutpin;
}
}
return 0; 
 }