What is webcasting?
Different from Video Conferencing?
What are the drivers?
Key market technologies
ProLearn Live Trails
ProLearn Summer School 2006
Basic audio-visual equipment for webcasting
Audio-Visual Webcasting Tips
Webcasting can be viewed as television
broadcasting over the Internet, with a single source being broadcast
to a large number of viewers. Like television, it carries with
it an association with a quality video and audio experience for
the participant, who is relatively passive and is taking part at
scale. In general it is also associated with lecture-like or strongly
presentational formats, although there is also often a local participation
(as in a “studio audience”) who are used to represent
the larger body of remote participants.
Figure 1 – A basic webcast network diagram (Apple™ 2006)
From a technical point of view, webcasting involves the capture
of video (and audio) by a PC (or dedicated encoder) that is
then encoded to reduce the bandwidth requirements for transmission over the
internet, this stream of data is then sent in real time to a streaming server
where it is distributed to end viewers, who can watch the video in real time,
or view the recording of the event later. Webcasting consists of five principle
elements, video/audio source, encoder, network, streaming server, webcast
clients (see Figure 1).