How to use DirectShow to convert from AVI to MPG1

[jim]

Hi:
I have some video files ,I want to convert some avi file to MPG1
files use DirectShow.
I tried to use code as :
pBuilder->SetOutputFileName(&MEDIASUBTYPE_MPEG1System,
T2W(szOutFilename), &pMux, &pWriter);
//this function return "not found register class".
If use MEDIASUBTYPE_Avi build-in convertion,return successful.

I need your help,can you give me some demo code?
Thank you in advance.

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