Visual Circuits Mantis MC, Руководство пользователя

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External Control Commands
159
C
ROSS
-
CHANNEL
S
YNCHRONIZATION
Cross-channel synchronization is a set of functions that provides
the capability to synchronize a group of Mantis channels, so that
every video output displays the same frame number at the same
time. This coordination is active; should one channel drift behind
or ahead of the others, the variation is detected and the speed of the
channel is adjusted until it is back in sync with the group.
A synchronization group is defined by a master channel which
plays normally, and a set of slave channels that follow it, i.e.
synchronize with the master channel. A group can have a minimum
of 2 channels or a maximum that is the total number of channels in
in the system.
Cross-channel synchronization has the following features:
❏
Multiple synchronization groups
The Mantis can support multiple synchronization groups.
❏
Synchronized files must be the same length in frames.
To insure that synchronized files start and stop precisely,
they must have the same run time, i.e. number of frames.
❏
Synchronization is accurate to +/- one frame between the
master and slave channels.
❏
Only the master channel in a group can output audio. The
slave channels output only video, even when their files have
audio tracks, e.g. program stream files.
File Length for Looping Playlists
Likewise, when synchronizing looping playlists, the
files playing simultaneously must have the same
number of frames to insure that they and the playlists
stay synchronized.