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Chapter 4-Additional Conferencing Information
Polycom, Inc. 4-7
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 only conferences) – requiring a higher bit rate, for high quality
display or highly detailed graphics.
• Live Video (AVC only conferences) – highest bit rate, for video clips or live video
display.
• Customized Content Rate (AVC only conferences) - that allows manual definition of
the Conference Content Rate.
AVC Only 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 RMX can decrease the allocated Content bit rate
during a conference.
Table 4-3 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 4-3 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 2048 4096 6144
Graphics 64 64 128 128 256 256 256 256 256 256 1536
Hi Resolution
Graphics
64 128 192 256 384 384 512 768 768 1536 1536
Live Video 64 128 256 384 512 768 768 1152 1152 1536 1536
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 Conferences” on page 4-14.