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
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Страница 9: ...vii Default Conference Template Properties Video Switch A 16 ...
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Страница 376: ...Chapter 10 Conference Templates Full Parameters View 10 90 ...
Страница 413: ...MGC WebCommander User s Guide 11 37 The template is saved with the modified parameters ...
Страница 414: ...Chapter 11 Managing Participant Templates 11 38 ...
Страница 434: ...Appendix A Default Templates A 20 ...