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Chapter 3-Additional Conferencing Information
Polycom, Inc. 3-7
Content Settings
The Content channel can transmit one of the following modes:
• Graphics – for standard graphics. This is the default mode in AVC conferences and the
only supported mode for SVC conferences.
• Hi-res Graphics (AVC CP Only) – requiring a higher bit rate, for high quality display or
highly detailed graphics.
• Live Video
(AVC CP Only) – highest bit rate, for video clips or live video display.
• Customized Content Rate (AVC CP Only)
- that allows manual definition of the
Conference Content Rate.
AVC CP Content Setting
For Graphics, Hi-res Graphics and Live Video, the highest common Content bit rate is
calculated for the conference each time an endpoint connects. Therefore, if an endpoint
connects to an ongoing conference at a lower bit rate than the current bit rate, the Content
bit rate for the current conference is re-calculated and decreased.
Bit rate allocation by the MCU is dynamic during the conference and when the Content
channel closes, the video bit rate of the People conference is restored to its maximum.
During a conference the MCU will not permit an endpoint to increase its bit rate, it can
however change its Content resolution. The Collaboration Server can decrease the allocated
Content bit rate during a conference.
The following table summarizes the bit rate allocated to the Content channel from the video
channel in each of the Content Settings according to the conference line rate:
Table 3-4 summarizes the Maximum Resolution of Content and Frames per Second (fps) for Bit
Rate Allocations to the Content Channel.
Table 3-3 Decision Matrix - Bit Rate Allocation to Content Channel per Conference Line Rate
Content
Settings
Content Bit Rate Allocation per Conference Line Rate (kbps)
64
96
128 256 384 512
768
832
1024
1152
1472
1728
1920
Graphics 64 64 128 128 256 256 256 256
Hi Resolution
Graphics
64 128 192 256 384 384 512 768
Live Video 64 128 256 384 512 768 768 1152
Customized
Content Rate
The Content Bit Rate is selected from a menu in the Content Video
Definition pane. See "Selecting a Customized Content Rate in AVC CP
Conferences” on page 3-13.