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RealPresence Collaboration Server Virtual Edition Administrator’s Guide
4-2 Polycom, Inc.
• In panoramic Video Layouts:
— SD: Participants that send CIF also receive CIF.
— HD: the Collaboration Server transmits HD and receives SD or lower resolutions,
the Collaboration Server scales images from SD to HD resolution.
H.264 High Profile Support in CP Conferences
The H.264 High Profile is a new addition to the H.264 video protocol suite. It uses the most
efficient video data compression algorithms to even further reduce bandwidth requirements
for video data streams.
Video quality is maintained at bit rates that are up to 50% lower than previously required.
For example, a 512Kbps call will have the video quality of a 1Mbps HD call while a 1Mbps
HD call has higher video quality at the same (1Mbps) bit rate.
Guidelines
• H.264 High Profile is supported in H.323 and SIP networking environments.
• H.264 High Profile is supported in Continuous Presence conferences at all bit rates, video
resolutions and layouts.
• H.264 High Profile is the first protocol declared by the Collaboration Server, to ensure
that endpoints that support the protocol will connect using it.
Setting minimum bit rate thresholds that are lower than the default may affect the video
quality of endpoints that do not support the H.264 High Profile.
• For monitoring purposes, the Collaboration Server and endpoint H.264 High Profile
capability is listed in the Participant Properties - H.245 and SDP tabs for H.323
participants and SIP participants respectively.
For more information see "IP Participant Properties” on page 12-20.
• H.264 High Profile is not supported:
— For Content Sharing
— As an RSS Recording link
— With Video Preview
CP Conferencing with H.263 4CIF
The video resolution of 4CIF in H.263 endpoints is only supported for line rates of 384 Kbps
to 1920 Kbps as shown in Table 4-1.
H.264 High-Profile should be used when all or most endpoints support it.
Table 4-1 Video Quality vs. Line Rate
Endpoint Line Rate Kbps
Video Quality
Resolution Frame Rate
128 CIF 30
256 CIF 30