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changes.mady.by.user Bahdan Tsiulkou

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  1. Go to the Hardware tab in the System settings window.
  2. Select the Camera object corresponding to the required camera in the objects object tree.
  3. Go to the Basic settings tab on the settings panel of the Camera object.
  4. In the Pre-alarm record field, specify the time interval (sec) of pre-alarm events event recording.
  5. Click the Apply button.

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Specifying the long pre-record time can result in increasing the waste of running memory. The recommended pre-record time is not no more than 20 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 in length to the archive (maximum size, by default) and use the following formula: 

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Info
titleNote

Example.

The camera performs pre-recording for 15 seconds with a hot record speed of 25 fpsFPS. The size of the 500-frame fragment is 20 MB. 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.

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