MPEG-4 Systems: Overview

Understanding Timelines Within MPEG Standards

“…An MPEG-4 overview is given in [40], including its architecture, multiplexing and sync aspects. MPEG-4 is a layered model divided into three layers ( Fig.…”

“…SL is the sole mechanism defined for this purpose in MPEG-4. It is a packet-based interface (SL packet is the smallest data unit), i.e., a flexible and configurable packetization facility, which provides the tools to share information (including timing information) between the CL and DL layers [40]. SL provides the insertion of timing and framing information into the related data packets, i.e., complete AUs.…”

Delivering object-based audio visual services

“…The ability to create object-based scenes and presentations creates many possibilities for a new generation of applications and services. The MPEG-4 series of standards specify tools for such object-based audio-visual presentations [20] [106]. While Audio and Video parts of the standard specify new and efficient algorithms for encoding media, the Systems part of MPEG-4 makes the standard radically different by specifies the tools for object-based representation of presentations.…”

“…The MPEG-4 Systems specification provides the glue that binds the audio-visual objects in a presentation [8] streams that describe the contents of the presentation, and a clock reference stream [20][64] [110]. All the data flows between a client and a server are SL-packetized.…”

“…audio-visual data that corresponds to the objects in a scene [20]. A scene consists of one or more audio-visual objects with each of these objects associated with an elementary stream that carries the corresponding data.…”