As the part of CCTV shopping list, deciding how much quality output from the recorder is the must. There is no magical specification or any number provided, and that’s why one needs to determine the quality of the recorded picture that is required for self-use or while using it in the courtly matter. After deciding the quality, check the DVR cards samples that could meet your standards. DVR stands for Digital Video Recorder that has a minimum of four analog video input and 16 maximum in one card.
DVR cards are generally used for recording multiple video signals. The software used for DVR cards vary in density, but the typical software that is used in DVR cards is recording to hard disk, alarms and Motion Detection. There are two main types of DVR cards: Hardware compression and Software Compression types. Let’s see them:
Software Compression: This type of system has Digital to Analog analog of video formats like MPEG4, H.264, etc.
Hardware Compression: This type of card has all the features that the Software Compression model has, however, it also has the electronics on the card that do video compression and processing as well. These cards are widely used because of their less straining on PC resources, as the Hardware Compression card is doing most of the work. But they are expensive than Software Compression. These types of cards should be chosen accordingly to the kind of compression is required.
DVR Cards can be bought with 8, 9 or 10-bit video resolution variants that also includes different recording resolutions and live view. There is chipset in DVR cards, which plays a vital role during selection. If the card has Windows software supplied then the choice is not that important, but when the card is used with Linux or any third party software, it is necessary to check the chipset used on the card is compatible with the OS and software that is going to be used.
While some software needs a computer that runs the DVR system, some allow you to use the computer for other operations at the same time. Many DVR cards require separate partition on the computer’s hard drive where it is purely made for storing the recorded content. This is benefitted to the computer as the operation is faster and the OS is not overwritten on the second drive, without disrupting the original drive.