... System.

This research was supported by NSF grant ANI-9907994, NSF equipment grant CDA-9512332, and contributions from Fujitsu, Intel, and NEC.

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... switch.

A matrix switch is a crossbar switch that can send any input to multiple outputs. A typical switch routes both audio and video signals although the signals can be controlled independently. Matrix switches are also called routing switches.

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... session.

A multicast session contains only one media format. It is specified by a multicast address and port pair.

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... system

http://www.panja.com/integrator/amx/

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... session.

In the television community, a source is defined as cameras and other devices that produce video signals. In webcasts, however, the medium of transport is packets rather than analog signals. Sources are therefore better defined to be packet streams. Under this definition, the capture machine in figure 2 is the source, not the cameras or other devices connected to the matrix switch.

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... Set.

A service is created for each special-effect that can be applied during a webcast. Multiple instances of an effect can be created and used simultaneously.

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... thumbnail.

Thumbnails are updated once per second and video windows are updated as specified in the stream being displayed.

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