Polycom WEBCOMMANDER 8 - Manual (Page 311)

MGC WebCommander User’s Guide
10-25
Video Protocol
(con’t) H264 - The H.264 standard provides better
compression of video images in lower line rate
connections and is part of the Highest Common
mechanism in Video Switching conferences.
When the conference line rate is up to 384 Kbps,
and the Video Protocol is set to Auto (in both VSW
and CP conferences) the system tries to connect the
participant using H.264 video protocol first. Only if
the endpoint does not support H.264, the system
tries to connect the participant using H.263 or H.261.
When H.264 is selected, the Video Format is
disabled and set to Auto.
Video Format CIF and QCIF are video formats used in video
conferencing systems. Video Format specifies the
data rate (in number of frames per second) and the
resolution of each frame (number of lines in a frame
and the number of pixels in each line).
Video Format is enabled only in Video Switching
mode and when the Video Protocol is set to H.261 or
H.263.
CIF (Common Intermediate Format) - Each frame
contains 288 lines and 352 pixels per line. The data
rate is up to 30 frames per second (FPS)
QCIF (Quarter Common Intermediate Format) -
Each frame contains 144 lines and 176 pixels per
line (it is one-fourth the resolution of CIF).
This field is disabled if the Video Protocol field is set
to Auto.
• Using the H.261 protocol, you can select Auto,
QCIF, or CIF.
Select Auto to allow the system to select the
video format for the conference according to the
participants' capabilities and enable the dynamic
adjustment of the highest common video
resolution. In such a case, the system will
connect all the participants in CIF format.
If one of the participants' endpoints does not
support CIF, the conference video format will
change to QCIF for all the participants.
Table 10-3: Basic Conference Parameters
Option Description