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RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Administrator’s Guide
Polycom®, Inc. 148
H.264 HD (AVC CP default)
The H.264 HD option should be selected only if most endpoints in the conference support H.264 to ensure
high quality Content.
When this protocol option is selected, endpoints must connect at Content bit rates above a minimum as
specified by specific System Flags to ensure high quality Content for all participants. For more information
about System Flags see Setting the Minimum Content Rate for Each Content Quality Setting for H.264 HD.
Bit rate allocation to the Content channel by the Collaboration Server is dynamic according to the
conference line rate and Content Setting selected for the conference. For more information see Content
Sharing Parameters in Content Highest Common (Content Video Switching) Mode.
Endpoints that do not support H.264, or those that do not meet the minimum line rate threshold for the
Content Setting along with ISDN endpoints, are connected as Legacy Endpoints and receive content
through their video channel will not receive content. If the Send Content to Legacy Endpoints selection is
disabled, these endpoints will not receive content.
Guidelines for Sharing Content Using H.264 HD
● Only endpoints that support H.264 capability at a resolutions of HD720p5 or higher will be able to
receive and send Content.
● This option is not available in SVC Conferencing Mode and CP and SVC Conferencing Mode.
● When H.264 HD is selected, the Send Content to Legacy Endpoints selection is enabled by default
in the Conference Profile – Video Settings tab.
● Maximum supported content resolution is HD 720p.
● Once an endpoint is categorized as a Legacy Endpoint and receives the content over the video
channel, it remains in this mode without the ability to upgrade to H.264 HD content and receive
content over the Content channel.
● The minimum Content Rate required for allowing a participant to share Content is the lower valued
parameter when comparing the System Flag setting (H.264 HD System Flags) and the content bit
rate allocation derived from the conference line rate (Participant Content Sharing Based on
Connection Line Rate and System Flag Setting).
When the flag settings enable an endpoint to share Content at a content rate that is lower than the
conference content rate (Participant Content Sharing Based on Connection Line Rate and System
Flag Setting), the content rate of the entire conference is reduced to the content rate supported by
that endpoint.
Setting the Minimum Content Rate for Each Content Quality Setting for H.264 HD
System Flags determine the minimum line rate required for endpoints to share H.264 high quality content
for each Content Setting: Graphics, Hi Resolution Graphics and Live Video.
H.264 HD System Flags
Content Settings Flag Name Range Default
Graphics H264_HD_GRAPHICS_MIN_CONTENT_RATE 0-1536 128
Hi Resolution Graphics H264_HD_HIGHRES_MIN_CONTENT_RATE 0-1536 256
Live Video H264_HD_LIVEVIDEO_MIN_CONTENT_RATE 0-1536 384