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Example.

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