VCS VideoJet 8000 User Manual page 91

Chapter 5
The VideoJet 8000 uses a special recording mode for alarm recording to optimize
the use of storage capacity. As soon as a time slot begins for the alarm recording,
continuous recording starts on a segment the size of a complete alarm sequence
(pre- and post-alarm). This segment on the partition works like a ring buffer and
is overwritten again and again until an alarm is actually triggered. After that,
recording on this segment will go on for the time predefined for post-alarm
recording, and then a new segment will be used in the same way. For this reason
the recorded alarm file is always saved in its full length to the partition and the
recording space required for each alarm recording can be calculated easily.
Note
When the time slots for default and alarm recording overlap, the default
recording has priority.
Number of alarms:
Here you set the number of alarm tracks on the partition. One alarm event can be
recorded on each alarm track. The specified number of alarms can be recorded
and archived accordingly. A partition can contain a maximum of 128 alarm
recordings. If the option Ring mode is set for the partition, the predefined number
of the latest alarm recordings will be stored. If the option Linear mode is set,
recording will stop as soon as all the alarm tracks have been written.
Pre-alarm recording frame rate:
You can select the frame rate for pre-alarm recording. The option All frames is
used to record at 25 fps (PAL) or 30 fps (NTSC) from a camera to its assigned
partition. Other settings result in a lower frame rate.
Post-alarm recording frame rate:
You can select the frame rate for alarm recording. The option All frames is used
to record at 25 fps (PAL) or 30 fps (NTSC) from a camera to its assigned partition.
Other settings result in a lower frame rate.
Pre-alarm time:
Select the period to be covered by the pre-alarm recording.
Post-alarm time:
Select the duration of the alarm recording.
VideoJet 8000
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