June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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Surveillance Systems and Videoconferencing
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341
point a stationary camera, zoom in and out, and so forth. More sophisticated cam-
eras add infrared night vision, multicast streaming, and other cool features.
To check out some surveillance cameras that are inadvertently avail-
able for your perusal on the Internet, trying Googling:
inurl:"ViewerFrame?Mode="
Video can eat up a lot of network bandwidth, 5 to 25 times that of a typical G.711
phone call, depending on the video codecs, resolution, and color depth employed.
Some developers, like DIVR Systems (http://www.divrsystems.com) offer remote
video surveillance solutions that ride on the same network as VoIP. In order to keep
from having video swamp the network and break down phone call quality, your
video surveillance apps need to play nice with QoS. This means making sure that
surveillance traffic is treated with a lower priority than phone call traffic.
Videoconferencing
Video meetings are closer to telephony than video surveillance, but their require-
ments are a bit different. First off, while video surveillance needs reliable delivery to
ensure that every frame of video is recorded, videoconferencing is more like a phone
call; if a frame gets dropped here and there, no problem. So reliable packet delivery,
a la TCP, isn’t necessary. ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.