A Centralized VOD System,
Continued
MPEG-2 Video Over IP
The IP technology is used to forward MPEG-2 compressed video streams over a
network.
The mapping of MPEG-2 compressed video over IP has recently been standardized
in IETF’s RFC-2250. This RFC describes how to map an integer amount of MPEG-2
packets to an RTP packet.
MPEG 2
188 bytes
MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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RTP
Header
UDP
Header
MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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UDP
Header
MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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RTP
Header
IP
Header
GbE
Header
UDP
Header
MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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RTP
Header
IP
Header
TR
MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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MPEG 2
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RTP
Header
In practice, a more simple mapping method is used instead of the one described by
RFC-2250. The MPEG-2 packets are directly mapped on UDP.
The stream of MPEG-2 packets is split in groups of an integer number of packets and
mapped in the contents field of the UDP frame. The UDP header contains a source
and destination port address. VOD applications use the destination UDP port to
identify the movie. The UDP frame is mapped in the contents field of an IP frame.
The IP header contains the source and destination address, which enables routers
and switches to direct the streams to the correct destination.
The Real Time Protocol (RTP) is a generic standard for the transmission of real-time
services over IP-based systems.
The User Datagram Protocol (UDP) is commonly used in the IP world to send
messages from a source application to a destination application. UDP does not have
error correction mechanisms. You can use it for uni-directional messaging such as
for real-time transport applications.
4004949 Rev C
Video On Demand
B-5
Summary of Contents for Continuum DVP eXtra Dense QAM Array
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