Digital video recorders (DVRs) have changed the way security professionals view recording both literally and figuratively with tremendous advancements in technology. In addition to stand-alone DVRs, there are numerous software-driven digital recording systems that provide enterprise-wide features. In any event, at last count, it is estimated that there are now some 200 different DVRs on the market. Here’s where the definition of “real-time” may need to be re-examined.
DVRs are inherently different from their analog ancestors by nature of how they record and their ability to manipulate video images. Compression is a significant factor in deciding the resolution and size of an image. It is also a factor when determining the rate of recording – or ips. Take a look at a good comparison of DVR features and specs and you’ll see a variety of terms listed for compression modes – extended, normal, fine, super fine – high quality, medium, standard – basic, normal, enhanced. Anyway you interpret them, it amounts to good, better and best. In plain English: the lower the compression, the better the image. The higher the compression, the less detail and quality.