Advanced Video Processing and Networking
Figure 6.2 Mapping of MPEG-2 TS Packets
6.1.3 MPEG Layer
The MPEG-2/DVB layer is specified in ISO/IEC IS 13818 Generic Coding of Moving
Pictures and Associated Audio. The main functionality of this layer is to transform
MPTS (Multi-Program Transport Streams) into a number of SPTS (Single-Program
Transport Streams). A Transport Stream carrying multiple programs is in this way
split into a number of mini Transport Streams, each carrying a single program. This
ensures that the video can be passed through limited bandwidth links such as ADSL
further down the transmission path.
6.1.4 RTP Layer
The RTP layer is optional, and will add an 8-byte RTP header to the new packet.
This header contains a sequence number and a time stamp.
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