Truth About DVR's

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DERISCO Incorporated

Eye-in-the-Sky Video Surveillance Services

Point Of Sale, Video Surveillance, Custom Computer, and Networking Systems sales service and repair.

(480) 732-0799

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The Truth About DVR’s and NVR's:

Digital Video Recorders (DVR’s) and Network Video Recorders (NVR's are basically a computer taking the video inputs and recording it to a hard disk drive. The video is captured by a capture card for older analog systems and a network card for the NVR systems. Basically a VCR on steroids with no tape changes.

The quality and duration of the recordings are directly proportional to the quality of the components and the size of the hard disk drive or drives. Higher quality DVR’s and NVR's use multiple 300 to 500 gigabyte hard disk drives and high quality video capture cards (DVR's).

Frame Rates:

The human eye sees 30 frames per second. As frame rates get lower the video gets choppier and loses fluid motion.

Following is a chart of frame rates:

Frames Per Second (FPS) Per Camera	% of what the eye can see or real time	Frames Per Second (FPS) Per Camera	% of what the eye can see or real time
30	100.00%	14	46.70%
29	96.70%	13	43.30%
28	93.30%	12	40.00%
27	90.00%	11	36.70%
26	86.70%	10	33.30%
25	83.30%	9	30.00%
24	80.00%	8	26.70%
23	76.70%	7.5	25.00%
22	73.30%	7	23.30%
21	70.00%	6	20.00%
20	66.70%	5	16.70%
19	63.30%	4	13.30%
18	60.00%	3	10.00%
17	56.70%	2	6.70%
16	53.30%	1	3.30%
15	50.00%

Frame rates or frames per second (fps) are often used in the Digital Video Recorder and Camera Industry to show quality. However they are often distorted like:

A 4 channel DVR that claims 30fps is actually recording 30fps divided by 4 channels which equals 7.5 frames recorded.
Or a 4 channel DVR claiming 30fps viewable doesn’t mean 30 fps recorded.
Or an 8 channel 120fps DVR is actually recording 15fps or half of what your eye sees.

Another deception is:

Some companies advertise that their DVR’s have 165 Gigabyte Hard Disk Drives to impress you with things that do not mean anything to you.

The truth is if you are recording 30 fps you might get 2 to 3 days of recording.

These are deceptive marketing practices designed to prey on the uninformed and We believe this is just wrong.

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Eye-in-the-Sky Video Surveillance Services a division of DERISCO Inc.

(480) 732-0799

The Truth About DVR’s and NVR's:

Peace of Mind and a Credible Deterrent Starting as Low as $6.25 per Day ! ! ! . . . While You’re Running the Business . . . We’re Keeping an Eye on the Store.

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Last modified: 07/16/2010