NETAVIS Observer 4.6 User Manual (October 2015)
Page 161 of 204
Please note
: If there is an active continuous recording in MPEG format, it does not make sense
to have any
Pre/post-event recording (sec)
set for the event-based recording. This is because
MPEG recording is only done in one quality. See also below for further considerations on pre- and
post-event recording.
8.
iCAT events for this camera are only stored in the Event database and only appear in the
Event
list
if the flag
Save event in Event list
is switched on. Otherwise only the recording will start
but no event will be generated.
You can override this setting for individual iCAT events selectively in the corresponding iCAT
definition (e.g.
15.3.4 Defining an event trigger for people and object counting (Smart Tripwire)
on
page 148).
9.
For all other recording settings please refer to
7.1.1 Programming continuous timed recordings
on
page 71.
10.
Press
Save
.
Note
: iCAT-triggered event generation and recording is only active if there is an enabled iCAT
interval and there is at least one enabled iCAT definition assigned. Outside of this time interval
there is no recording or event generation. Furthermore, recording is started only if either of the
fields for
Pre/post-event recording (sec)
is bigger than zero.
Further considerations for pre- and post-event recording
Observer allows you to define the frame rate and quality of event-based recordings. If you want to save
video streams for events generated by the video analytics toolkit iCAT please keep in mind that
Observer needs to analyze the video stream that it later stores.
Some cameras have limitations when providing multiple video streams at different qualities and
frame rates. Therefore Observer tries to retrieve only 1 video stream with 1 quality and frame rate
setting whenever possible. This also helps to keep the CPU load for the server and the camera at a
minimum.
Here is some information about how event-based recording depending on the video format and
pre/post-event frame rate setting is done. This can help you to tune your system to better fit your
needs while reducing burden on the server and the camera. For further information on which video
format is best for iCAT please refer also to
15.2.1 Considerations for setting up a system with iCAT
on
page 142.
Please note:
If the recording event is not generated by iCAT, then the recording behavior is the same
as described here, just iCAT is not analyzing the video stream. Simple motion detection involves iCAT.
If both, iCAT-based and other event-triggered recording is active at the same time, iCAT recording
parameters have priority for obtaining pre-alarm streams.
Event-based recording for iCAT in MJPEG format
Different frame rates for pre and post event recording
Observer obtains a separate stream for iCAT analyses (for further information please refer to the
sub-section
Multi-streaming operation with iCAT
in
15.2.1 Considerations for setting up a
system with iCAT
on page 142) and also uses this stream for pre-event recording. In case of an
