c# DirectShow no register issue when save video into disk with Mpeg2Video

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C#

I want to save the video into disk file with the C# VS2010/.Net DirectShowLib 2005/Win7 32bits OS

//Define variable as below:
 ICaptureGraphBuilder2 capGraph
 IBaseFilter fWriter
 IFileSinkFilter pTmpSink
 ....

//I use below function to save Avi/Asf file successfully.
 int hr = capGraph.SetOutputFileName( MediaSubType.Avi, szOutputFileName, out asfWriter, out pTmpSink);
 ...

//But it fail to save other video type such as Mpeg2Video with below error information:
 int hr = capGraph.SetOutputFileName( MediaSubType.Mpeg2Video, szOutputFileName, out asfWriter, out pTmpSink);
 ...

No register class (exception come from HRESULT:0x80040154 (REGDB_E_CLASSNOTREG))
Please help me how can I use the Mpeg2Video to save the file successfully, thanks a lot!

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