This method is called on each input or output frame. This method is SYNC so the video stream is blocked while this method is called.

Sub OnFrame( _
   ByVal llCallbackUserData As Long, _
   ByVal bsName As String, _
   ByVal pMFrame As Object _
) 

void OnFrame( 
   long llCallbackUserData,
   string bsName,
   object pMFrame
)

procedure OnFrame( 
    llCallbackUserData: Int64;
    bsName: String;
    pMFrame: TObject
); 

void OnFrame( 
   long llCallbackUserData,
   BSTR* bsName,
   IUnknown* pMFrame
)