Interface Not supported. Interface Not implemented. Interface Retrieves the filter graph that the render engine has constructed, if any. It receives the value NULL if there is no filter graph. Be sure to release the interface when you are finished using it.
Interface Retrieves the output pin for the specified group .
Address of a pointer to receive the output pin's IPin interface. Group does not have an output pin. Before calling this method, call ConnectFrontEnd to build the front end of the graph. Each group represents a single media stream, and the front end has a corresponding output pin. You can use this method to create the rendering portion of a file-writing graph.