Canon VK-64 Administrator's Manual page 129

Record for before event - enter a number of seconds for the amount of recording
2
time before the event occurs (up to a maximum of 30 seconds).
● If Continuous Recording is also set, Record for before event is
not available.
Note
● If Record for before event is set to one second or longer, it
may take approximately 10 seconds after event occurrence
until its display.
Record for after event - enter a number of seconds for the amount of recording
3
time after the event has transpired (up to a maximum of 999 seconds).
Click OK to save the new settings and close the dialog.
Click Cancel to discard the new settings.
If the before and after event fields are set to 0 seconds, video
will still be recorded while the sensor is activated.
Note
Longer pre-event recording will increase memory usage.
Longer pre-event recording with insufficient memory may
greatly reduce performance when the disk-based virtual
memory runs short.
Even when Record for after event is enabled, the frame rate,
frame size and network delays may have an effect on when the
last frame is recorded and thus the full requested duration of
post event recording may not be available.
Setting Sensor Event Recording
4
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