3.3.5.10 Sending a Current Media Type Request
The structure and fields of the Current Media Type Request message are specified in section 2.2.3.9.
The server sends this message to obtain the stream format currently selected on the specified video stream. The server MUST send this message only after a successful Activate Device Request (section 3.3.5.5) message and before any Deactivate Device Request (section 3.3.5.21) message.