How To Decode a frame mp4 from IMFSourceReader::ReadSample using CLSID_CMpeg4sDecMFT

Dear sir.

I would like to extract a image frame from a MPEG-4 part 2 file.

I have done on MPEG-4 file. but as MPEG-4 part 2 did not.

Here's the source code.

----------------------------------

 TCHAR BASED_CODE szFilter[] = _T("MPEG-4 Files (*.mp4)|*.mp4|All Files (*.*)|*.*||");
 CFileDialog dialogOpenFile(TRUE, _T("mp4"), NULL, OFN_FILEMUSTEXIST, szFilter, this);
 if (IDCANCEL == dialogOpenFile.DoModal())
 {
  return;
 }

 CString strFileName = dialogOpenFile.GetPathName();

 CComPtr<IMFSourceReader> SourceReader;
 VERIFY(S_OK == MFCreateSourceReaderFromURL(strFileName, nullptr, &SourceReader));

 CComPtr<IMFTransform > pMpeg4sDecoder;
 VERIFY(S_OK == pMpeg4sDecoder.CoCreateInstance(CLSID_CMpeg4sDecMFT));

 UINT32 Width, Height;
 CComPtr <IMFMediaType>pInputType;
 CComPtr <IMFMediaType>pOutputType;

 for (DWORD MediaTypeIndex = 0;; MediaTypeIndex++)
 {
  CComPtr < IMFMediaType> pNativeType;
  if (S_OK != SourceReader->GetNativeMediaType(MF_SOURCE_READER_FIRST_VIDEO_STREAM,MediaTypeIndex, &pNativeType))
  {
   break;
  }
  MFGetAttributeSize(pNativeType, MF_MT_FRAME_SIZE, &Width,&Height);
  GUID majorType, subtype;
  pNativeType->GetGUID(MF_MT_MAJOR_TYPE, &majorType);
  if (majorType == MFMediaType_Video)
  {
   GUID NativeSubtype;
   pNativeType->GetGUID(MF_MT_SUBTYPE, &NativeSubtype);

   MFCreateMediaType(&pInputType);
   pInputType->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Video);
   pInputType->SetGUID(MF_MT_SUBTYPE, MFVideoFormat_MP4V);
   VERIFY(S_OK == SourceReader->SetCurrentMediaType(MF_SOURCE_READER_FIRST_VIDEO_STREAM, nullptr, pInputType));
   VERIFY(S_OK == MFSetAttributeSize(pInputType, MF_MT_FRAME_SIZE, Width, Height));
   VERIFY(S_OK == pMpeg4sDecoder->SetInputType(0, pNativeType, 0));

   MFCreateMediaType(&pOutputType);
   pOutputType->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Video);
   pOutputType->SetGUID(MF_MT_SUBTYPE, MEDIASUBTYPE_YV12);
   VERIFY(S_OK == MFSetAttributeSize(pOutputType, MF_MT_FRAME_SIZE, Width, Height));
   VERIFY(S_OK == pMpeg4sDecoder->SetOutputType(0, pOutputType, 0));

  }
 }

 SourceReader->SetStreamSelection(MF_SOURCE_READER_ANY_STREAM, FALSE);
 SourceReader->SetStreamSelection(MF_SOURCE_READER_FIRST_VIDEO_STREAM, TRUE);
 DWORD StreamIndex, Flags;
 LONGLONG TimeStamp;
CComPtr<IMFSample> Sample;
SourceReader->ReadSample(MF_SOURCE_READER_FIRST_VIDEO_STREAM, 0, &StreamIndex, &Flags, &TimeStamp, &Sample);
  if (Flags & MF_SOURCE_READERF_ENDOFSTREAM)
  {
   return;
  }
  HRESULT hr;

  VERIFY(S_OK==(hr= pMpeg4sDecoder->ProcessInput(0, Sample, 0) ));

-----------------

The last line fails with E_UNEXPECTED Catastrophic failure.

I think that  the pMpeg4sDecoder is correctly configured.but I don't have a resolution.

I looked for the more infomation of CLSID_CMpeg4sDecMFT, but I found only a following page.

https://msdn.microsoft.com/ja-jp/library/windows/desktop/ff819454%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396

Please tell me my wrong point.

Sincerely yours.