Digital Signal Processing Reference
In-Depth Information
18
VIDEO OVER IP
CHAPTER OUTLINE
18.1 Basics of Internet Protocol (IP) ............................................................ 169
18.2 Encapsulation ............................................................................................ 171
18.3 Video Streams........................................................................................... 171
18.4 Transport Protocols ................................................................................. 172
18.5 IP Transport ............................................................................................... 173
18.6 Video Over Internet Issues .................................................................... 175
18.7 Video Streaming....................................................................................... 176
18.8 Multicast Video ........................................................................................ 177
18.9 Video Conferencing ................................................................................. 178
Video over IP is becoming increasingly common. Ever larger
numbers of people are switching from cable or satellite TV to
IPTV, downloading programming over their internet connection.
This can allow them to select what they want to watch, and avoid
monthly cable or satellite fees. Websites such as YouTube provide
both uploading and downloading of video content to millions of
users. Even pornography is becoming an increasingly web-hosted
video business.
18.1 Basics of Internet Protocol (IP)
Internet protocol is a communication system. Unlike the
telephone system, it does not require a connection between the
sender and receiver. Instead, the information is broken up into
packets, and each packet finds its own path over the IP network
from source to destination. These networks can be public such as
the internet, or private such as a corporate network. The source,
destination and every node in the network has an address, which
is 32 bits, or eight hexadecimal bits. When expressed decimally, it
is in the familiar form of xxx.xxx.xx.xx, or 10 decimal digits. The
packets have two major components: the header and the data.
The IP header is 20 bytes, and the data is a variable length up to
65615 bytes.
