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MGC Manager User’s Guide - Volume I
4-23
Video Conference Parameters
The basic parameters that define the quality of a video conference are:
• Line Rate - The transfer rate of video and audio streams. The higher the
line rate, the better video quality that can be viewed. In Video Switching
conferences, all conference participants must connect using the same line
rate, therefore the participant with the lowest line rate connection
determines the line rate for the conference.
For more information, see “Conference Settings” on page 4-44.
• Audio Algorithm - The audio compression algorithm determines the
quality of the conference audio. Several algorithms are available for
selection.
For more information, see “Conference Settings” on page 4-44.
• Video protocol, video format, frame rate, annexes, and interlaced
video mode - These parameters define the quality of the video images.
Setting the video protocol to H.263 results in a better image quality than
using H.261, and H.264 protocol provides better compression of video
images in line rates lower than 384 Kbps. However, not all endpoints
support H.263, or H.264, therefore in a Video Switching session which
requires that all participants use the same video protocol, video format
and frame rate, it is the endpoint that supports the lowest video quality
that dictates the video settings for the conference.
For more information, see “Conference Settings” on page 4-44.
• Video Sources - In Continuous Presence conferences you can select the
layout of the video windows and force participants to specific windows
in the layout. In addition, visual effects for the displayed video windows
(such as frames, frame color and background color) can be selected.
Visual effects are available only for conferences running on the Video+
card.
For more information, see “Video Sources” on page 4-71.
Additional video settings can be configured for video conferences to allow
greater customization and options during video conferences.