Sharing Content During Conferences
Polycom®, Inc.
133
Highest Common Calculation Depending on Content Settings
For Graphics, Hi-res Graphics and Live Video (see
Content Settings
), the highest common content is
calculated for the conference each time an endpoint connects. Highest Common content bit rate is
calculated using:
●
For H.263 - Line rate
●
For H.264 - Line rate, resolution, and frame rate.
Therefore, when endpoints with lower capabilities connect to an ongoing conference, content parameters
are re-calculated and decreased accordingly.
During content sharing, the MCU does not permit endpoints to increase their content bit rate, only their
content resolution.
For more information, see
H.264 Highest Common Content Rates Tables
. For information on minimum
content rates as determined by system flags, see
H.264 HD System Flags
.
Fixed Rate
In this method the content rate is fixed, and endpoints not supporting this rate do not receive content over
the content channel. Endpoints whose capabilities are too low, can
only view
content over the people video
layout (see
Sending Content to Legacy Endpoints
).
For H.263 cascaded conferences, the MCU automatically uses a
fixed rate
(once a cascaded link is
detected) according to the content rates described in
Highest Common and Fixed Content Bit Rate
Allocation for H.263
.
For H.264 cascaded conferences, the MCU uses a
fixed rate
according to the content rates described in
H.264 Cascade Optimized (Fixed) Content Rates Tables
, and the high/base profile configured by the user.
Multiple Content Resolutions
In this method, the content is shared in multiple streams, one for each video protocol: H.263 (optional) and
H.264HD (mandatory). Separate video resources are used for processing the content for each of the
required content streams. The MCU then applies the Highest-Common principle for sharing content with
each group of endpoints.
In cascading conferences, an additional resource is dedicated for the cascading link(s), the H.264 Cascade
option must be selected, and content is shared over the cascaded link(s) using fixed rates.
As a consequence, using this method allows endpoints with different capabilities to connect/disconnect
without having to repeatedly restart content sharing process.
This method must be used for cascaded conferences.
This method is often related to as content transcoding.
Summary of Contents for RealPresence RMX 4000
Page 135: ...Defining SVC and Mixed CP and SVC Conference Profiles Polycom Inc 104 12 Click the IVR tab ...
Page 468: ...Conference and Participant Monitoring Polycom Inc 437 ...
Page 578: ...Network Security Polycom Inc 547 3 Define the following fields ...
Page 992: ...Appendix D Ad Hoc Conferencing and External Database Authentication Polycom Inc 961 ...