3GPP developed the Packet-switched Streaming Service (PSS) to cater for mobile unicast streaming applications. Nowadays, PSS is widely deployed in mobile devices and mobile operators are increasingly offering streaming services based on PSS. The 3GPP PSS standard consists of a set of specifications that cover different aspects of the streaming service such as the transport protocols and codecs [3], the 3GPP file format [14], which is also used by other services based on pre-encoded contents, and the 3GPP timed text format [15].