How to select best ccct Dvr in india!!Difference between plastic body and metal body DVRBe careful when comparing DVRs
We see a lot of misleading information when it comes to DVRs. An example of this is supposedly high definition 1080P DVR recorders which only actually record in standard definition. Because the HDMI or VGA output is 1080P they are advertised accordingly. The on screen menu will be nice and clear but the live images and recorded footage will be standard definition.
We also see lots of examples where misleading recording times are quoted. The compression codec on most DVRs is H.264 so there is no magic way to extend recording times other than to reduce quality. The higher the resolution you record at the less storage time you get from your hard drive. A lot of people quote storage times based on the lowest possible recording resolution but users natuarally select the highest possible resolution. We also see recording times based on motion only event recording. This is extremely misleading and essentially a made up number as you have no idea how many events will be triggered. We always recommend 24/7 recording with events just used to bookmark potentially important footage.
DVR recorders can be quite complicated and there is a lot to get your head around. It is important that there is aftersales support available. When you purchase from a large organistion who sell lots of different products like ebay, Amazon or multi national retailers getting support can be difficult due to the many different models they sell.
Beware of real time DVR recording
Many people who don't fully understand CCTV promote real time DVR recorders as being a good thing. The single biggest mistake you can make when it comes to DVRs, particularly High definition DVRs is selecting real time.
First of all what is real time? When you go to the cinema what you are actually seeing is a series of still images shown so quickly that you think the subject is moving. Cinemas project at 24 frames per second, this is quick enough to trick the brain, you can no longer make out the individual stills. The problem with using 24 frames per second with CCTV is that it generates too much data for the hard drive to store. This is particularly relevant when it comes to HD CCTV.
You don't need anything like 24 frames per second. We recommend between 3 and 6 frames per second for CCTV use. This takes up less space on the DVR hard drive without costing much in terms of evidence gathering.
Maximum recording resolution - if you only read one thing on the page read this!
There's no point in producing top quality images if the DVR is only going to record them at a low quality.
Our HD DVR recorders are actually hybrid. You can use standard D1 or 960H cameras as well as our HD TVI 1080P cameras. This means you can replace an existing DVR, use your current cameras then add HD cameras over a period of time. In most cases you will be able to use your existing cabling.
In ascending order of quality these are the main resolutions
Standard definition
CIF is the lowest quality used and comprises a frame size of 352 x 288 pixels
Half D1, also known as "Field" or 2 CIF is 704 x 288 pixels
D1 is 704 x 576 pixels
960H is 960 x 576 pixels. 960H and D1 are actually the same resolution. D1 has a 4:3 aspect ratio, 960H a 16:9 aspect ratio and the extra pixels fill in the space at the edge of the image. The resolution or pixel density is identical
High definition
720P is 1280 x 720 pixels or 0.9 megapixels. This is the lowest HD resolution
1080P is 1920 x 1080 pixels or 2.1 megapixels. All our HD products are 1080P
1080N resolution
This is a bit of a con. HD 1080P and HD 1080N sound pretty similar but they are very different. HD 1080P is 1920 by 1080 pixels or 2.1 megapixels. 1080N on the other hand is only 1080 by 960 pixels or 1 megapixel. Don't get caught out.
3MP, 4MP & 4K
Throwing pixels at wide angle cameras is like trying to heat your home with the doors and windows wide open - you will never win. HD1080P is high enough resolution to get great images if the cameras are zoomed in properly. 4MP halves your storage time but only gives you a 40% "improvement" in the image. 4K theoretically doubles the quality of the image but needs 8x more hard drive space. 21 days rolling footage at HD 1
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