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Chapter 3-Video Protocols and Resolution Configuration for CP Conferencing
Polycom, Inc. 3-21
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.
Endpoints that do not support H.264 High Profile will connect according to the minimum
bitrate thresholds defined by the following System Flags:
• H264_BASE_PROFILE_MIN_RATE_SD30_SHARPNESS
• H264_BASE_PROFILE_MIN_RATE_HD720P30_SHARPNESS
• H264_BASE_PROFILE_MIN_RATE_HD1080P30_SHARPNESS
• H264_BASE_PROFILE_MIN_RATE_CIF60_MOTION
• H264_BASE_PROFILE_MIN_RATE_SD60_MOTION
• H264_BASE_PROFILE_MIN_RATE_HD720P60_MOTION
These System Flags must be added to the System Configuration file before they can be
modified. For more information see the "Modifying System Flags” on page 22-1.
Example: If the High Profile Optimized option is selected in the Resolution Configuration dialog
box and the System Flag values are set as in the following table:
Endpoints will connect at resolutions as set out in the following table, depending on
whether they support H.264 High Profile or not:
System Flag Default Value
H264_BASE_PROFILE_MIN_RATE_SD30_SHARPNESS 256
H264_BASE_PROFILE_MIN_RATE_HD720P30_SHARPNESS 1024
H264_BASE_PROFILE_MIN_RATE_HD1080P30_SHARPNESS 1536
H264_BASE_PROFILE_MIN_RATE_CIF60_MOTION 256
H264_BASE_PROFILE_MIN_RATE_SD60_MOTION 1024
H264_BASE_PROFILE_MIN_RATE_HD720P60_MOTION 1536
Video Quality
Setting
Endpoint Connection Bit Rate (kbps)
Resolution
High Profile Supported High Profile Not Supported
Sharpness
128<= bit rate <512 256<= bit rate <1024 SD30
512<= bit rate <1024 1024<= bit rate <1536 HD720p30
1024<= bit rate 1536<= bit rate HD1080p30
Motion
128<= bit rate <512 256<= bit rate <1024 CIF60
512<= bit rate <832 1024<= bit rate <1536 SD60
832<= bit rate 1536<= bit rate HD720p60