Manual

14
1. Enable the Pre-Rec Motion option.
2. Click the Arrow button beside. This dialog box appears.
Figure 1-7
[Pre-Record Performance] The amount of physical memory of the computer that the system
is running on determines the pre-recording performance. Some options are grayed out if the
computer does not have enough memory for the selections.
This table shows the maximum pre-recording frame rate and the physical memory
requirements of each setup:
Good Better Best Extra
Maximum pre-recording frames per camera (fps) 15 fps 30 fps 60 fps 90 fps
RAM required 128 MB 256 MB 512 MB 768 MB
Note: The recording frame rate is based on a 320x240 recording size.
[Pre-Record Option (per camera)] Determines the number of pre-record frames.
 Total Frames: Specify the maximum pre-recording frames of the system.
 Frame/Sec Limitation: Specify the maximum pre-recording frame rate (fps) of a
camera.
Dividing the Total Frames by Frames/Sec Limitation, you will get the pre-recording
duration of each camera. For example:
Pre-recording duration = Total Frames = 30 = 5 seconds
Frame/Sec
Limitation
6
[Pre-Recording using HDD] Use the hard disk as a pre-recording buffer. This method gives
you much longer pre-recording time.