Polycom RealPresence 1500 Administrator's Manual page 89

The Collaboration Server supports the VUI addition to the H.264 protocol for endpoints that transmit
wide video (16:9) in standard 4SIF resolution.
When there is a change of speaker in a Continuous Presence conference, the transition is set by
default to fade in the current speaker while fading out the previous speaker.
To make this transition visually pleasant, fading in the current speaker while fading out the previous
speaker is done over a period of 500 milliseconds.
The Fade In/Out feature can be disabled by adding FADE_IN_FADE_OUT as a new flag to the
System Configuration, and setting its value to NO.
For more information about System Flags, see
12 To select the Video Layout for the conference, click the required number of windows from the
layouts bar and then select the windows array. The selected layout is displayed in the Video Layout
pane.
Video Layout Options
Number of Video Windows
1
2
3
4
5+
9
10+
Overlay
Polycom®, Inc.
Modifying System
Available Video Layouts
For more information see
Defining AVC-Based Conference Profiles
Flags.
Overlay Layouts.
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