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Table 10-3: Basic Conference Parameters
Option
Pro-Motion
Dual Stream Mode
MGC WebCommander User's Guide
Description
Interlaced Video is enabled only in the Video
Switching mode.
Pro-Motion is a video encoding mechanism that
improves the video quality in Video Switching (VSW)
conferences, set to NTSC or PAL (4CIF) resolution.
Select either 50 Fields (PAL) or 60 Fields (NTSC).
Pro-Motion is sent to the endpoint at 60 Fields Per
Second (FPS) for NTSC and 50 FPS for PAL
systems. The interlaced video mechanism takes two
separate video frames and merges them into a
single frame. For example, NTSC is transmitted at
30 FPS and during the process of transmission
frame A consists of "240 even" lines and frame B
consists of "240 odd" lines.
When frames A and B are merged into a single
frame, the result is total number of 480 lines. The
totals of their frame speed are also added together,
30FPS + 30FPS, resulting in a frame resolution of
60FPS.
Note: When a conference is set to any Pro-Motion
option, endpoints sending a Pro-Motion video
resolution (for example, NTSC instead of PAL or
vice-versa) or that do not send a Pro-Motion
resolution, connect as secondary (Audio Only).
In this mode, one of the endpoints sends two video
streams: Video and data. The video streams are
handled differently by the receiving endpoint. The
different streams may be shown on separate
screens.
Select one of the following options:
None - The Dual Video mode is unavailable. In such
a case Video Protocol is set to Auto.
H.239 and People+Content - H.239 and
People+Content are very similar in function, but
differ in the type of signaling used for each protocol.
People+Content is the Polycom proprietary protocol
while H.239 is the industry standard.
10-21
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