CCTV Camera Pros Geovision 8.4 Multicam Digital Surveillance System - Manual (Page 30)

14
[Monitor Option]
„ Start Delay: Starts monitoring after x second(s) when the system is activated.
„ Post-Rec: Keeps on recording for a set period of time after motion stops.
„ Pre-Rec: Records video for a set period of time before motion starts or an input device is
triggered. This feature allows you to choose RAM or HDD as a pre-recording buffer. The
difference between the two is that RAM can save smaller pre-record from 1 second to 1.5 minutes,
while the hard disk can save larger one from 1 minute to 45 minutes.
Figure 1-5
[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: