RealPresence Collaboration Server (RMX) 800s/Virtual Edition Administrator’s Guide
Polycom®, Inc.
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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.
By default every conference, Entry Queue and Meeting Room has the ability to declare the maximum CP
resolution as defined for the system. This includes conferences launched by the
Collaboration Server Web
Client
and conferences started via the API.
CP conferencing is defined in the Conference profile by setting the following main
features:
●
Setting the
Conferencing Mode
to
CP only
●
Conference Line Rate
●
Video Layout
Video Protocol Support in CP Conferences
The video protocol selected by the system determines the video compression standard used by the
endpoints. In Continuous Presence conferences, the system selects the best video protocol for each of the
endpoint according to he endpoint’s capabilities.
The following Video protocols are supported in CP conferences:
●
H.261 -
the legacy video compression algorithm mandatory to all endpoints. It is used by endpoints
that do not support other protocols.
●
H.263
-
a video compression algorithm that provides a better video quality than H.261. This standard
is not supported by all endpoints.
●
H.264 Base Profile
-
a video compression standard that offers improved video quality, especially at
line rates lower than 384 Kbps.
H.264 High Profile
allows higher quality video to be transmitted at lower line rates.
●
RTV -
a video protocol that provides high quality video conferencing capability to
Microsoft OCS
(Office Communicator Server)
endpoints at resolutions up to
HD720p30
. (SIP only).
AVC
Basic Conferencing Parameters
The main parameters that define the quality of an AVC-based video conference and its display are:
●
Line (Bit) Rate -
The transfer rate of video and audio streams. The higher the line (bit) rate, the better
the video quality. The MCU supports the following line rates:
CP Conferences: 64kbps to
4096kbps
●
Audio Algorithm -
The audio compression algorithm determines the quality of the conference audio.
●
Video protocol, video format, frame rate, annexes, and interlaced video mode
- These
parameters define the quality of the video images. The Collaboration Server will send video at the
best possible resolution supported by endpoints regardless of the resolution received from the
endpoints.
When
Sharpness
is selected as the
Video Quality
setting in the
Conference Profile
, the
Collaboration Server will send 4CIF (H.263) at 15fps instead of CIF (H.264) at 30fps.