Polycom® RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide
3-2
Polycom, Inc.
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 RMX transmits HD
and receives SD or lower resolutions.
•
In panoramic
Video Layouts
:
—
SD
: Participants that send CIF also receive CIF.
—
HD
: the RMX transmits HD and receives SD or lower resolutions, the RMX 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 with
MPMx
cards only.
•
H.264 High Profile
is supported in
H.323, SIP
and
ISDN
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 RMX, 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 RMX 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
13-15
.
•
H.264 High Profile
is not supported:
—
For
Content
Sharing
H.264 High-Profile should be used when all or most endpoints support it.
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