mpeg1 layer 2 audio (mp2 or m2a) files

[simoncn]

The UPnP protocol doesn't permit the server to change the transcoding target type depending on what renderer you are using. This is because the server is required to state the stream MIME type to the control point before the control point has selected the renderer. By the time the control point has selected the renderer and the renderer has contacted the server, it is too late for the server to change the stream MIME type.