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After reconfiguring the CPE we manage to capture the stream at the client level.<br />
The fallowing picture shows the case of an UDP unicast stream. For the client the<br />
network outside is completely transparent. The flow from the server has as a source<br />
address the IP address of the CPE acting as router/NAT. The VLC client has no need to<br />
know the VLC server address because it just opens the network streams and receives<br />
them if they exist.<br />
We can also notice that the UDP packet encapsulates a MP2T packet that<br />
represents a Transport Stream used by MPEG encoding method. The TS packets can then<br />
be multiplexed and transmitted using broadcasting techniques, such as those used in<br />
DVB.<br />
Those TS (MP2T) are formed by Packetized Elementary Stream (MPEG-PES) that<br />
are a specification in the MPEG-2 Part 1 (Systems) (ISO/IEC 13818-1) and ITU-T<br />
H.222.0. PES defines carrying of elementary streams in packets within MPEG program<br />
stream and MPEG transport stream. The elementary stream is packetized by<br />
encapsulating sequential data bytes from the elementary stream inside PES packet<br />
headers as in the next figure:<br />
31
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