Filter
Top Products
Polycom, Inc. 4-1
4
Video Protocols and Resolution
Configuration for CP Conferencing
Video Resolutions in AVC-based CP Conferencing
The Polycom
®
RealPresence
®
Collaboration Server always attempts to connect to endpoints
at the highest line rate defined for the conference. If the connection cannot be established
using the conference line rate, the Collaboration Server attempts to connect at the next
highest line rate at its highest supported resolution.
Depending on the line rate, the Collaboration Server sends video at the best possible
resolution supported by the endpoint regardless of the resolution received from the
endpoint.
The video resolution is also defined by the Video Quality settings in the Profile.
The combination of frame rate and resolution affects the number of video resources
required on the MCU to support the call.
The following resolutions are supported:
• CIF 352 x 288 pixels.
• SD 720 x 576 pixels.
• HD 720p 1280 x 720 pixels.
Video Display with CIF, SD and HD Video Connections
Although any combination of CIF, SD and HD connections is supported in all CP
conferences, the following rules apply:
• In a 1X1 Video Layout:
— SD: If the speaker transmits CIF, the MCU will send CIF to all participants,
including the SD participants. In any other layout the MCU will transmit to each
participant at the participant’s sending resolution.
— HD: The MCU transmits speaker resolution (including input from HD
participants) at up to SD resolution. If 1x1 is the requested layout for the entire
duration of the conference, set the conference to HD Video Switching mode.
• In asymmetrical Video Layouts:
— SD: A participant in the large frame that sends CIF is displayed in CIF.
— HD: Where participants’ video windows are different sizes, the Collaboration Server
transmits HD and receives SD or lower resolutions.
The following video resolution information applies to AVC Conferencing Mode.
For a description of resolutions for SVC Conferencing Mode see
“SVC-based Conferencing”.