Network video server (DVS, digitalvideoserver), also known as digital video encoder, is a professional network transmission device that compresses and processes audio and video data. It consists of audio and video compression codec chip, input and output channels, network interface, audio and video interface. RS485 serial interface control, protocol interface control, system software management, etc., mainly to provide video compression or decompression functions, complete image data acquisition or recovery, etc., currently popular MPEG-4 or H.264-based images Data compression transfers data and audio data through the Internet.
Four basic features of network video server
With the development of network technology and the popularity of broadband networks, network video surveillance will gradually encroach on the market share of traditional video surveillance equipment. Let's take a look at the four basic characteristics of video servers:
1, the model is small. Generally, it is usually 1-4 channels of analog video input. It does not have more than a dozen video inputs like a hard disk recorder, and it does not carry a hard disk randomly. Putting the storage device in the monitoring center is more conducive to the storage and protection of image data. Save a lot of space.
2, simplicity. Through the current fast-developing, cost-effective computer communication network to transmit video data to the monitoring center, only a low-cost Category 5 network cable is needed. If the video server has a WIFI module inside, and adopts the wireless LAN mode, then even 5 classes Network cables are saved.
3. Powerful center control. An industrial standard server and a set of control management application software can run the entire monitoring system. Users only need to open a client program on a computer connected to the Internet, and enter the IP address of the corresponding video server to perform full remote operation. Monitoring. Any authorized client can access any camera directly, or access the monitored image through a central server.
4. Easy to upgrade and fully scalable. Easily add more cameras, and the central server will be able to easily upgrade to faster processors, larger capacity disk drives, and more bandwidth in the future.
Network Video Server Advantage Dissection
1. Convenience of installation and maintenance
Some people may say, "Now the network bandwidth is not enough, using optical transceivers and optical fibers for remote transmission, the quality and transmission speed of video images is better than network transmission." However, the cost and complexity of laying fiber optics are difficult for many customers and engineers. Due to the popularity of computer networks, network monitoring systems can be built in places where the network is available, and installation costs are greatly reduced.
2, easy to use, want to see it
Network monitoring is not limited by time and location. It can be monitored on demand at any time. It can selectively view images of a specified location without the need to view images, and saves network bandwidth resources.
3, with more intelligence
A large amount of information can be extracted from the video stream in a timely and automatic manner, which can be transmitted, saved, retrieved, stored off-site, and stored in multiple machines; the camera can be programmed to transmit images only when certain events occur.
4, the image attenuation is small, the quality is guaranteed
Using advanced digital compression technology, digital signals are less attenuated during transmission and quality is guaranteed. When the analog video signal is transmitted over a long distance, the signal is attenuated and video amplifier compensation needs to be configured.
5, stable and reliable
The network video server adopts an embedded operating system, and the hardware uses a high-performance chip to work stably.
6, can achieve wireless network transmission
Using the network video server to convert the video signal of the camera into a digital signal, in the case of inconvenient transportation and difficult wiring, the digital video signal can be sent to the monitoring center by setting up the wireless local area network, and then distributed by the monitoring center to the Internet for the remote end. The management department is watching. The advantages of WLAN are convenient networking, short cycle, low investment and flexible structure.
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