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Chapter 7. Transporting and Storing MPEG... > Transporting MPEG-4 over IP

7.5. Transporting MPEG-4 over IP

A number of proprietary formats exist to convey streaming, real-time data over IP. Each owner of such a format may make use of MPEG-4 stream types in their context. Of course, such an approach cannot be considered as the basis for an open standardization process. On the other hand, unlike the transport of MPEG-4 content over MPEG-2, a specification for the transport of MPEG-4 over IP could not be accomplished within the MPEG community alone, because specifications in the realm of IP are typically dealt with by the IETF, even though their requests for comments (RFCs) do not have the formal status of an International Standard. By 1996, the IETF had created RTP [RFC1889] in an attempt to facilitate the transport of real-time data over IP. Transport of MPEG-4 streams makes use of RTP as well. A short overview of RTP and the protocols associated with it to control a streaming media application is given first in the following, before detailing how MPEG-4 data is mapped to this framework.

7.5.1. Brief Introduction to Streaming over IP

Conveying real-time data over IP requires a data packetization protocol that allows synchronization, RTP, and protocols for discovering and controlling the real-time presentations. The Session Description Protocol (SDP) [RFC2327] allows describing the content of the streaming presentation, much like ODs (MPEG-4) or program-specific information (MPEG-2). The RTSP [RFC2326] provides presentation control, like START, PAUSE, STOP.


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