H.263 4Cif Guidelines; The Cp Resolution Decision Matrix; H.264 Base Profile And High Profile Comparison - Polycom RealPresence 800s Administrator's Manual

RealPresence Collaboration Server (RMX) 800s/Virtual Edition Administrator's Guide

H.263 4CIF Guidelines

● H.263 4CIF is supported with H.323 and SIP connection endpoints.
● H.263 4CIF is supported in CP mode only.
● Click & View is supported in H.263 4CIF.
● AES encryption is supported with H.263 4CIF.
● H.263 4CIF is supported in recording by the RSS2000 and other recording devices.
● All video layouts are supported in H.263 4CIF, except 1x1 layout. In a 1x1 layout, the resolution will
be CIF.
● For information about Resource Usage see Table 19-7 on page 19-8.
● H.239 is supported in H.263 4CIF and is based on the same bandwidth decision matrix as for HD.

The CP Resolution Decision Matrix

All the CP resolution options and settings are based on a decision matrix which matches video resolutions
to connection line rates, with the aim of providing the best balance between resource usage and video
quality at any given line rate.
The following factors affect the decision matrices:
● The video protocol used: H.264 base Profile or H.264 High Profile. The H.264 High Profile maintains
the Video quality at bit rates that are up to 50% lower than previously required. For example, a 512
kbps 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.
By default, the system shipped with three pre-defined settings of the decision matrix for H.264 Base Profile
and three pre-defined settings of the decision matrix for H.264 High Profile:
● Resource-Quality Balanced (default)
A balance between video quality and resource usage.
● Resource Optimized
System resource usage is optimized by allowing high resolution connections only at high line rates
and may result in lower video resolutions (in comparison to other resolution configurations) for some
line rates. This option allows to save MCU resources and increase the number of participant
connections.
● Video Quality Optimized
Video is optimized through higher resolution connections at lower line rates increasing the resource
usage at lower line rates. This may decrease the number of participant connections.
Video Resource Usage
Video resource usage is dependent on the participant's line rate, resolution and Video Quality settings.

H.264 Base Profile and High Profile Comparison

The following illustrations show a comparison between the resolutions used at various line rates for H.264
Baseline and the H.264 High Profile Video Quality setting.
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