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Note
titleAttention!

Video isn't recorded in Pre-alarm record mode for cameras without video compression that have been added to the corresponding list in the Video subsystem section in of the tweaki.exe utility (see The Settings panel of the Video subsystem section).

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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

NA

Disarmed

Program

With pre-alarm recording

In Axxon PSIM, one can perform pre-alarm recording if the camera is disarmed. You can do it with the help of the DoReact("CAM","1","REC","rollback<1>") program; (see The Script object. Programming using the JScript language).

Specifying the long pre-record time can result in increasing the waste of running memory. Recommended The recommended pre-record time is not more than 20s20 seconds.

To count the memory consumption, figure out the average size of the video signal frame. To do this, you must record the video fragment of 500 frames length to the archive (maximum size, by default) and use the following formula: 

Frame size = Fragment size / 500

Note , that the frame size also depends on the percent of motion in the frame.

You can count the size of the pre-record buffer for one camera if the frame size is known:

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General memory consumption in the pre-record mode is defined by the sum of values for each camera.

If cameras perform pre-record recording with equal frame frequency, you can use the following formula:

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Info
titleNote

Example.

The camera performs pre-record recording for 15 seconds with the a hot record speed of 25 fps. Size The size of the 500-frames frame fragment is 20 MbMB. It is required to define the size of the pre-record buffer for such a camera.

First, it is necessary to define the average frame size:

Frame size = Fragment size / 500 = 20 MB/500 frames = 0.04 MB

So, the size of the pre-record buffer is:

The memory consumption in the pre-record mode for one camera, MB = Pre-record time, sec * Frame frequency in the pre-record mode, fps * Frame size, MB = 15 sec * 25 fps * 0.04 MB = 15 MB.

Tip
iconfalse
Watch video

Configuring video in the pre-alarm record mode is complete.