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Conferencing Modes Overview
Polycom®, Inc. 12
streams into one video stream that includes the input from the other endpoints arranges in the selected
video layout.
Participants do not see themselves in the video layout. By Default, the speaker is shown in the top left layout
cell in symmetric layouts, in the larger cell in asymmetric layouts, or in full screen. The speaker sees the
previous speakers (their number depends on the number of cells on the speaker’s layout.
The Continuous Presence video session offers layouts to accommodate different numbers of participants
and conference settings including support of the VUI annex to the H.264 protocol for endpoints that transmit
wide video instead of 4CIF resolution. Each participant can select his/her layout for viewing during the
conference, as can be seen in AVC Continuous Presence (CP) video streams and built layouts.
For conferences with more participants than display squares, the RealPresnce Collaboration Server
dynamic video mix capability allows the viewed sites to be modified throughout the conference. The
displayed layout can be changed during an ongoing conference, allowing a participant to view different
screen layouts of the other conference participants. These layout options allow conferences to have greater
flexibility when displaying a large number of participants and maximizes the screen’s effectiveness.
AVC Continuous Presence (CP) video streams and built layouts
Video quality in Continuous Presence conferences is affected by the conference line rate (that determines
the maximum line rate to be used by the connecting endpoints), and the video capabilities of the endpoints
such as the video protocol, video resolution and frame rate. Content sharing is available in all CP
conferences.
This requires extensive processing of the video sent to each participant in the conference. The higher the
video rate and resolution, the more processing power is required.