QNAP Security VioStor NVR (Version: 3.5.1) - Manual (Page 201)

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(1) Recording
Select the channels (IP cameras or video servers) which will start recording when an
event occurs. The following options are also available:
(i) Enter the time (in seconds) the recording should be executed after the event is
triggered.
(ii) Start recording when the event starts and stop recording when the event ends.
The option (ii) is applicable to the duration events only. A duration event is an
event with the start and end time and lasts for a period of time. It does not
include the events related to status change, such as camera disconnection or NVR
recording failure.
If the action is triggered by a duration event and both settings (i, ii) are enabled,
the NVR will execute the second setting (ii) only.
Click ‘Select from the list’ to select an action setting which has been configured
before.