Digital DVR (Digital Video Recorder DVR for short) set tape recorder, quad processor, video switcher, full functionality of the controller, remote transmission system as a whole, itself connected Sensor, alarm, enable alarm linkage functionality, image mobile detection, also available through decoder control on cloud platform and lens, and control signals can be transmitted over the network image. Compared with traditional analog surveillance system, hard disk video recorder of one of the most striking feature is the set of simple, convenient for network monitoring and control, analog system unmatched superiority. Digital video recorder is a new trend of development of security industry, and quickly replace traditional analog systems devices.

Currently on the market there have been many brands and types of digital video recorder (DVR), both for foreign brands, there are also domestic brands of; PC, there are embedded;-PC can be further divided into LINUX-based operating systems and WINDOWS operating systems, and so on. Facing numerous Digital hard disk video recorder on the market (DVR), how people should choose?

Based on many years of work experience in the security industry, it is recommended that project developers and users at large should examine and choose from the following six aspects meeting the requirements of their own DVR.

A common fallacy, exclude views

Fallacy 1:Windows operating system instability, affecting stability of hard disk recorders

The stability of the system depends on two aspects: hardware and software, software, operating system and video software in two parts, either Windows98,Windows NT,Windows2000 or the Windows XP, are common throughout the world very good software, and as a DVR using just a small part of the operating system functions, there is no reason to doubt the stability of any operating system.

But video surveillance the use occurs during job insecurity, panic, what is causing the problem? It can be said that 100% is unreasonable or video hardware configuration software (application software) and nonstandard programming is causing the lockup.

Fallacy 2: machine card is causing a hardware conflict, affecting the stability of the system.

This problem often is the use of technology not mature or pirated wireless security camera video compression card card caused by, another reason is that hardware system setup has a problem. Machine cards are widely used industry standard, there is no reason to doubt their stability.

Fallacy 3: DVR Association "system halted"

Next-generation digital hard disk video recorders generally have a software or hardware watchdog protection system, when a hardware failure occurs, it will issue a warning prompt when software fails, it will automatically restart and automatic recovery. Therefore, no one's practice to keep the control room can rest assured that use.

Fallacy 4: DVR would not "system halted"

Although DVR from PC machine's software environment, on the surface completely solved the crash problem, however, if the hard drive fails, it as dead right. In fact a hard drive failure is one of the major fault of the DVR.

Fallacy-5:PC DVR has fallen behind, DVR is the development direction

PC-DVR forever with IT industry developments, network transmission, image quality, video processing speed far superior embedded systems, and on the action using the intuitive, flexible, fast and so on is incomparable for embedded systems, but its greatest weakness is vulnerable to malicious destruction of human, and this is precisely the advantage of embedded systems. So for now the two types of hard disk recorders their own strength, there will be a coexistence period.

Second, select a brand with intellectual property protection

Buy brand DVR mean selecting the qualified hardware devices, select licensed software, software upgrades are available in the future, if the system needs to be changed or expanded to the developer for technical support, will not be wasted investment, protect their investment interests.

Third, select after legitimate body inspection and certification of qualified

DVR detection in China at present, the only legal bodies are: the Ministry of public security police and security electronic products quality inspection center

Truly effective inspection report on its inspection of categories should be: type inspection

DVR production license in China at present, the only legitimate authority is: provincial public security Department

Four times, choose to adopt the latest video compression technology

Broken down by video compression technology, has entered its fourth generation of the today's hard disk video recorder:

First generation using Motion JPEG compression algorithm, which is characterized by large amount of files, consume system resources, so the network transfer speed slow; advantage is clear.

Second generation MPEG-1 compression algorithm, video compression process all done by the video card (hardware compression), do not consume CPU resources, so performance is very stable, is characterized by the amount of data is large, it is difficult to transmit over the currently used in a wide area network.

The third generation of MPEG-4 compression algorithm, characterized by a stream of smaller, very suitable for real-time audio and video image transmission network pure hardware compression, performance is more stable, so you can integrate greater functionality.

The fourth generation product is that we are the most popular H.264, also some other non-mainstream compression algorithm, which is not a presentation.

Five, Optional powerful integration of intelligent machines

Six friendly machine, easy to choose easy to use and manage

author:Kelly Brummond, security-cctv-camera.com's commentator

source:http://www.security-cctv-camera.com/

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