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MGC Manager User’s Guide - Volume I
6-73
The image handling process takes a number of seconds (a long time,
relatively) since a full 4CIF image is created while the VCP video card
receives four instances of the same still image and transmits them. The
estimated processing time for an Annex D image is 2 seconds.
When the request to send the Annex D image is received, the Video MCU can
be in one of the following states:
The following operations can be performed during the transmission of Annex
D images:
• Speaker changes, in order to return to the proper image upon the
completion of the Annex D transmission
• Video mute requests from participants
• Add/delete participants by the operator
Table 6-1: Annex D Image Processing and Video MCU State
Video MCU state when receiving
Annex D image
Video MCU behavior
The Annex D sender is video muted. The chair request /image transmission
is denied.
Some of the other endpoints are video
muted.
The request is accepted. These
participants are able to see the image,
but are not seen by other participants.
The Lecture Mode is ON and the
sender of the Annex D image is not the
lecturer.
The chair request /image transmission
is denied.
The Lecture Mode is ON and the
sender of the Annex D is the lecturer.
The request is accepted.
The Video Force feature is enabled,
and a participant other than the sender
is selected in the full screen (1x1).
The request for Annex D overrides the
forced video therefore the Annex D
processing continues.
The operator selects (forces) an
endpoint other than the sender, in the
full screen window at the conference
level.
The chair request /image transmission
is denied. (According to H.320
recommendation.)