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Glossary

Webcast

Transmitting your lecture or event over the web to a computer using compressed streaming formats such as RealVideo, Windows Media or Flash video.

Codec

Stands for compression/decompression and can be used for streaming video formats or video conferencing standards. Codecs can be software or hardware based (Windows Media would be considered a software based codec, and a Tandberg or Polycom video conferencing system could be considered a hardware based codec.)

Bit Rate

This refers to the speed with which streaming video is transmitted by the AMPS video servers. Depending upon the speed of the connection for the viewer, they can watch a particular bit rate. A lower bit rate is less quality, but can reach people with a smaller connection (like a dial up modem on their laptop.) The higher the bit rate, the higher the quality, but the more bandwidth it takes up to view.

Progressive Downloads

A format like Quicktime utilitizes progressive downloading to cache the beginning of the video before streaming.

Encoding

Encoding is the process of taking your live or videotaped lecture of event and compressing it into a streaming format.

Streaming Media

Usually refers to video encoded for the web that is streamed from a server, rather than downloaded to the viewer's computer.

Windows Media

Microsoft's media player that is built into Windows.

RealVideo

Propriety streaming format developed by Real Networks.

Quicktime

Apple's video format which is integrated with Macs or can be downloaded for use by Windows PCs.

Flash Video

Adobe's streaming format. This is a popular format that is built into web browsers.

Aspect Ratio

This refers to the shape of the video window — whether on videotape, a display such as a television, LCD or plasma display or streaming media. The two standards used on campus are 4:3 (standard television signal) and 16:9 (high definition).

Podcasting

A term made popular by Apple and iTunes, it is essentially streaming or downloading audio to a device for playback.