How can I reverse engineer a DirectShow graph?

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You can watch the graph you created using GraphEdit, a tool from the DirectShow SDK. In GraphEdit, select File->Connect to remote Graph…

In order to find your graph in the list, you have to register it in the running object table:

void AddToRot( IUnknown *pUnkGraph, DWORD *pdwRegister ) 
{
    IMoniker* pMoniker;
    IRunningObjectTable* pROT;
    GetRunningObjectTable( 0, &pROT );

    WCHAR wsz[256];     
    swprintf_s( wsz, L"FilterGraph %08p pid %08x", (DWORD_PTR)pUnkGraph, GetCurrentProcessId() );
    CreateItemMoniker( L"!", wsz, &pMoniker );

    pROT->Register( 0, pUnkGraph, pMoniker, pdwRegister );

    // Clean up any COM stuff here ...
}

After destroying your graph, you should remove it from the ROT by calling IRunningObjectTable::Revoke

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