Guidelines For Sharing Contents Using Multiple Content Resolutions - Polycom realpresence 1800 Administrator's Manual

In this method, the content is shared in multiple streams, one for each video protocol: H.263 (optional) and
H.264HD (mandatory). Separate video resources are used for processing the content for each of the
required content streams. The MCU then applies the Highest-Common principle for sharing content with
each group of endpoints.
In cascading conferences, an additional resource is dedicated for the cascading link(s), the H.264 Cascade
option must be selected, and content is shared over the cascaded link(s) using fixed rates.
As a consequence, using this method allows endpoints with different capabilities to connect/disconnect
without having to repeatedly restart content sharing process.

Guidelines for Sharing Contents using Multiple Content Resolutions

● Content is always provided to H.264 HD endpoints.
● The Send Content to Legacy Endpoints option is set, and cannot be modified.
● Additional resources are allocated to the conference (in addition to resources for the conference
participants) for content processing:
 Resources are allocated only upon first content sharing initiation, but once allocated, they remain
unchanged until conference ends.
 H.264 basic operation requires 1.5 HD video resources for HD720p30 (defined) resolution
conferences, and 2HD video resources for HD1080p15.
 An additional content stream can be sent to H.263 endpoints, in which case a separate resource
(1 HD) is allocated. H.263 supported resolutions are CIF, 4CIF, XGA.
 Content can be sent to cascaded links, in which case, the H.264 Cascade option must be
selected, and an additional video resource (1 HD) is allocated. The links in both MCUs must use
the same content parameters (meaning content rate, resolution, and frame rate).
● When resources are insufficient, Multiple Content Resolutions mode is disabled, and content sharing
reverts to Content Video Switching mode.
 If H.264 Cascade was selected for the conference, the conference uses H.264 Cascade
Optimized as the content protocol.
 If H.264 Cascade was not selected for the conference, H.264 HD protocol is used.
 Endpoints supporting only H.263, are considered as Legacy content endpoints (see
Content to Legacy
● TIP endpoints cannot share content, only view it over the people video layout.
● When AS SIP is enabled for the conference, Multiple Resolutions is selected and cannot be
modified, H.264 is enabled, and both H.263 and H.264 Cascade are disabled. Resources are
allocated on conference beginning. All this enables AS SIP performance in high-traffic environments.
● In the event of a media card malfunction (and reset), all Multiple Content Resolution conferences will
be terminated.
When using the Multiple Content Resolutions method, the following are not supported:
• High profile
• 1080p30/60 content resolutions. Only resolutions up to 1080p15 are supported.
Polycom®, Inc.
Endpoints) due to insufficient resources.
Sharing Content During Conferences
Sending
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