QNAP NAC-200, User Manual

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Event-driven Recording Settings
NAC-200 supports pre-recording function before events take place. You can enter
the number of seconds for pre-recording. The time for pre-recording varies to
resolution in use and the frame rate. Please refer to the following table as
reference.
Resolution
Maximum
no. of frame
recorded
File size of
each frame
Recording
frame rate
Maximum time
for pre-cording
(sec)
30 fps 5
320x240 160 10KB
1 fps 160
20 fps 2
640x480 40 40KB
1 fps 40
1280x1024 2 156KB 1 frame/ 3 sec 6
You can set the time for recording when an event happens, or select to stop
recording when the event stops.
The resolution and frame rate of event-driven recording are the same as that in
Video Settings. The recorded file is saved to same directory on the storage device
as Auto Recording settings.
When a few events take place continuously, and the recording for the previous event
has not finished, NAC-200 will record continuously starting from the first event and
will stop according to your settings for the last event.
Note: When the system is recording, there is at least a second’s lap between the
end time of previous event recording and the start time of the following recording.
It is recommended to set no less than 1 second for pre-recording when enabling
event recording settings to avoid missing record.
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