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Sharing Content During Conferences
Polycom®, Inc. 135
Content Settings
The Content channel can transmit in one of the following modes:
● Graphics (default) – For standard graphics.
● Hi-res Graphics – Requiring a higher bit rate to increase display quality or highly detailed graphics.
● Live Video – Highest bit rate, for video clips or live video display.
● Customized Content Rate - Allowing manual definition of the Conference Content Rate.
Content sharing consumes a quota of the video rate, depending on the content required quality; the better
the content required quality (such as in Live Video) the less bit rate remains for the video.
For each of the settings, the MCU allocates an approximate percentage (determined by the table in Content
Sharing Reference Tables) of the conference video capability towards content sharing: for Graphics - 33%,
for Hi-res Graphics - 50%, and for Live Video - 66%. However, in actuality this percentage might be lower,
since the endpoint capabilities are also taken into account when making this calculation.
Customized Content Rate
Customized Content Rate functionality may be implemented (see Selecting a Customized Content Rate)
when the content rate automatically calculated by the MCU is unsuitable.
For example, in a cascaded environment, the conference rate must be identical for all links. Yet, capabilities
may vary widely between the cascading conferences (such as one conference supporting 2 Mbps, while the
other - 512kbps).
The rates listed by the MCU are up to 66% of the conference maximum line rate.
Customized Content rate list comprised of single value of 0, means the conference bit rate capability is too
low to share content.
Customized content rate is not applicable to TIP content (when TIP compatibility is defined as Prefer TIP).
MCU Usage Modes of Content Protocols
Depending on the endpoints capabilities, you can determine the content sharing experience by selecting the
appropriate protocol and system behavior from the Content Protocol list:
● H.263
● H.263 & H.264 Auto Selection
● H.264 Cascade Optimized
● H.264 HD