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Information on pre-alarm recording options is given in the table.
Camera state | Recording initiator | Recording |
Armed | Macro | Without pre-alarm recording |
Armed | Manually | Without pre-alarm recording |
Armed | Alarm | With pre- alarm recording |
Armed | Program | With pre-alarm recording |
Disarmed | Macro | Without pre-alarm recording |
Disarmed | Manually | Without pre-alarm recording |
Disarmed | Alarm | - |
Disarmed | Program | With pre-alarm recording |
In INTELLECT™ one can make pre-alarm recording if camera is disarmed. One can do it with the help of DoReact("CAM","1","REC","rollback<1>") program; (see Programming Guide (JScript) The Script object. Programming using the JScript language ).
Specifying the long pre-record time can result in increasing the waste of running memory. Recommended pre-record time is not more than 20s.
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Size of pre-record buffer for one camera, MbMB=Pre-record time, sec * Frame frequency in the pre-record mode, fps * Frame size, MbMB.
General memory consumption in the pre-record mode is defined by sum of values for each camera.
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Size of pre-record buffer for all cameras in system, Mb MB = Number of cameras * Pre-record time, sec * Frame frequency in the pre-record mode, fps * Frame size, MbMB
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Example. Camera performs pre-record for 15 seconds with the hot record speed 25 fps. Size of 500-frames fragment is 20Mb20 Mb. It is required to define size of pre-record buffer for such camera. At first First, you it is necessary to define the average frame size: Frame size = Fragment size / 500 = 20Mb20 MB/500 frames = 0,04Mb.04 MB. So, the size of pre-record buffer is: The memory consumption in the pre-record mode for one camera, Mb MB = Pre-record time, sec * Frame frequency in the pre-record mode, fps * Frame size, Mb MB = 15 sec * 25 fps * 0,.04 Mb MB = 15Mb15 MB. |
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