A method of transmitting data in a media stream in accordance with a media streaming protocol includes generating data of a first type associated with a first type identifier in accordance with the protocol, encapsulating the generated data in a data structure defined by the protocol, the data structure including a type identifier field for specifying a type of data contained within the data structure, setting the type identifier field to a second type identifier different than the first type identifier, forming a packet comprising the first data structure, and transmitting the packet in the media stream.