User`s manual

DigiMux
Basic Operations 25
Event Recording and Playback
All video is recorded to the normal partition as indicated in your record setup. When
an event occurs, the event video during the response duration along with any pre-
alarm video, if enabled, is copied to the event partition. If it is necessary to purge the
normal partition, the event video is preserved in the event partition until you can
export it and purge the event partition.
When you play back an event from the normal partition, playback starts from the time
the event happened and continues until the end of the available recorded video. If
you playback the same event from the event partition, playback begins with pre-
alarm video (if enabled) and ends after the response duration expires. For example, if
an event of 2 minutes duration is played back from the event partition, and a 1
minute
pre-alarm is set, then the playback for the event is 3 minutes in length. Playback from
the normal partition is not limited to the response duration.
Pre-Alarm Availability
Pre-alarm video is contingent on normal video that is recorded to the normal
partition. When an alarm is triggered, the pre- and post-alarm video for the alarm
event is copied from the normal partition to an existing event partition. The pre-alarm
and alarm duration setup determine the length of this video segment.
Figure 6 — Normal and Event Partition Operation
Normal Partition
All Video Is Recorded
10:00:00 A. M.
10:40:00 A. M.
10:30:00 A. M.
10:20:00 A. M.
10:10:00 A. M.
10:50:00 A. M.
Pre-Alarm
Enabled
10:08:00
10:22:00
Event 1
Event 2
Event Partition
Events and Pre-Alarm Copied
Event 1
Event 2
Event 1 Start
Event 1 Stop
Event 2 Start
Event 2 Stop
N
o
P
r
e
-
A
l
a
r
m
10:35:00
Event 3
Event 3
Event 3 Start
Event 3 Stop
Pre-Alarm Video
Pre-Alarm Start
10:00:00 A. M.
10:50:00 A. M.