Monday, October 22, 2018

What CCTV DVR should I buy – keep 1 month data + 24 hours non-stop recording?

July 21, 2011 by admin  
Filed under CCTV DVR

My friend would like to install a CCTV DVR system in his business. He would like to keep the recording data for 1 month. If he opts for 16 channels with 24 hours non-stop recording, is it possible? Which storage capacity should he take? Is 750 Gmb enough?

Full resolution TV is about 1gb per hour per channel … so 16 camera’s would consume 384 Gb per day, 30 days comes to just over 11.5 Tb.

However modern CCTV systems only go into ‘record mode’ when movement is detected = and only record the ‘differences’ (since most camera’s have a fixed ‘viewpoint’ the background never changes ..) .. so ‘it depends’ on what the camera’s are looking at … even motorways have periods of no activity in the early hours of the morning.

Needless to say, outdoor camera’s are going to ‘consume’ a lot more recording space than indoors (as the lighting conditions change during the day & night (sunny / cloudy) and the wind & rain causes never ending ‘movement’ in the camera’s field of vision) whilst an office / factory will be ’static’ most of the night (except when the security guards do their rounds)

Finally, the computer software of many systems can be set to trip an alarm if movement is detected outside ‘normal working hours’ eg a door opening during the night / at the weekend in a factory or if movement is seen in what the user has set as a ’static’ zone (eg a car being moved from a car park). Many incorporate SIMM cards that allows the ‘alarm’ software to initiate phone calls & play a pre-recorded message (or send a ‘multimedia’ Text to a mobile along with a video clip’ of what triggered the alarm .. .. others will ’stream’ the live video to the company web site (so you can ‘log in’ and see what is happening ..)

Comments

One Response to “What CCTV DVR should I buy – keep 1 month data + 24 hours non-stop recording?”
  1. Steve B says:

    Full resolution TV is about 1gb per hour per channel … so 16 camera’s would consume 384 Gb per day, 30 days comes to just over 11.5 Tb.

    However modern CCTV systems only go into ‘record mode’ when movement is detected = and only record the ‘differences’ (since most camera’s have a fixed ‘viewpoint’ the background never changes ..) .. so ‘it depends’ on what the camera’s are looking at … even motorways have periods of no activity in the early hours of the morning.

    Further, many CCTV camera’s operate in IR mode at night .. this produces what is effectively a black & white image which consumes about half the space of color.

    Needless to say, outdoor camera’s are going to ‘consume’ a lot more recording space than indoors (as the lighting conditions change during the day & night (sunny / cloudy) and the wind & rain causes never ending ‘movement’ in the camera’s field of vision) whilst an office / factory will be ’static’ most of the night (except when the security guards do their rounds)

    To cut down on recording space, most systems allow the user to ‘mark’ ‘zones’ for the computer software to examine for movement (or zones to ignore when looking for movement) .. and many outdoor camera’s (and security lights) are linked to IR (Infra-Red = heat) detectors that ‘trigger’ recording only when ‘people sized’ warm bodies are spotted (this stops the camera’s from recording hours of nothing but tree branches waving in the wind).

    Finally, the computer software of many systems can be set to trip an alarm if movement is detected outside ‘normal working hours’ eg a door opening during the night / at the weekend in a factory or if movement is seen in what the user has set as a ’static’ zone (eg a car being moved from a car park). Many incorporate SIMM cards that allows the ‘alarm’ software to initiate phone calls & play a pre-recorded message (or send a ‘multimedia’ Text to a mobile along with a video clip’ of what triggered the alarm .. .. others will ’stream’ the live video to the company web site (so you can ‘log in’ and see what is happening ..)

    I suggest you do a bit of reading yourself and then consider getting some commercial CCTV suppliers to quote ..
    References :

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