Patent ID: 8472477

Claim:
A server system, comprising: an encoder for generating a Simple Aggregation Format (SAF) synchronization layer packet to multiplex diverse elementary streams including a scene description elementary stream; wherein the SAF synchronization layer packet includes: an SAF synchronization layer packet header; and an SAF synchronization layer packet payload, wherein the SAF synchronization layer packet header includes time information related to an access unit included in the SAF synchronization packet payload in which a composition time of a first composition time unit of the access unit is calculated based on a CompositionTimeStamp corresponding to time information, and a number of times of that a CompositionTimeStamp counter has wrapped around; wherein the SAF synchronization layer packet payload includes header information on the access unit and payload information indicating the access unit; wherein the payload information includes information on a URL and a cache unit on the data referred to at the URL; wherein the cache unit further includes information for replacing a previous cache unit with a cache unit included in a current payload information with respect to the same URL, or information for adding a cache unit included in the current payload information to a previous cache unit.