Mixed Cp And Svc Conferencing - Polycom RealPresence 800s Administrator's Manual

RealPresence Collaboration Server (RMX) 800s/Virtual Edition Administrator's Guide

Mixed CP and SVC Conferencing

In a mixed CP (AVC) and SVC conference, AVC-based endpoints and SVC-enabled endpoints can be
supported in the same conference.
In a mixed CP (AVC) and SVC conference, SVC endpoints transmit multiple resolutions and temporal layers
to the RealPresence Collaboration Server like the SVC-based conferences, while AVC endpoints, for
example, send only one AVC video stream to the Collaboration Server. Other endpoints (also referred to as
AVC endpoints as opposed to SVC endpoints) can send different video protocols, such as H.263. The
Collaboration Server relays SVC-encoded video bit streams to the SVC-enabled endpoints in the
conference according to their request. This enables the video conference layouts to be automatically
assembled by the endpoint. AVC endpoints connected to the conference send a single AVC video bit stream
to the Collaboration Server, which is then transcoded to SVC video streams. SVC-enabled endpoints
receive the AVC converted video bit streams through the Collaboration Server from the AVC endpoints as
a single SVC video bit stream. Alternatively, AVC endpoints receive a single video bit stream with the
defined video conference layout from the Collaboration Server. In this mixed mode conferencing, both SVC
and AVC endpoints in the conference receive the same CP layout.
The following diagram illustrates an example of a mixed CP and SVC conferencing mode:
In this example, an SVC endpoint (1) receives three video streams at different frame rates and resolutions,
and creates the conference layout with the received video streams. The video bit stream that the SVC
endpoint receives from the AVC endpoint (3) is decoded in the Collaboration Server and then encoded into
an SVC bit stream in the required resolution.
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