Network video server (DVS, digital video server), also known as digital video encoder, is a professional network transmission device for compressing and processing audio and video data. It consists of audio and video compression codec chip, input and output channels, network interface, and audio and video interface. , RS485 serial interface control, protocol interface control, system software management and other components, mainly to provide video compression or decompression functions, complete the collection or recovery of image data, the more popular image based on MPEG-4 or H.264 Data compression transfers data and audio data processing over 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 erode the market share of traditional video surveillance equipment. Here are four basic characteristics of video servers:
1, the model is small. Generally, it is usually 1-4 channels of analog video input. It will not move more than ten channels of video input like hard disk recorders, and it will not randomly carry hard disks. Placing storage devices at the monitoring center is more conducive to the storage and protection of image data. Save a lot of space.
2, simplicity. Through the rapid development of a cost-effective computer communication network to transmit video data to the monitoring center, only a low-cost type 5 network cable is required. If there is a WIFI module inside the video server and the wireless LAN is adopted, then there are five types of network cables. Network cables are saved.
3, a strong central 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 corresponding IP address of the video server to perform a full remote operation. Surveillance. Any authorized client can directly access any camera or access the monitored image through the central server.
4, easy to upgrade and full scalability. More cameras can be easily added, and the central server can easily be upgraded to faster processors, larger disk drives, and greater bandwidth in the future.
Network Video Server Advantages 1. Easy to install and maintain
Some people may say, "Now the network bandwidth is not enough, use optical fiber and optical fiber for remote transmission, video image quality and transmission speed is better than network transmission." However, the high cost of laying optical fiber and the complicated cabling project make it difficult for many customers and contractors to bear. Due to the popularization of computer networks, network monitoring systems can be constructed where there are networks, and installation costs are greatly reduced.
2, easy to use, want to see
Network monitoring is also not limited by time and place. It can monitor on-demand at any time, and can selectively view images at specified locations. Images that do not need to be viewed are not transmitted, saving network bandwidth resources.
3, with more intelligence
It can timely and automatically extract a large amount of information from the video stream. The information can be transmitted, saved, retrieved, stored offsite, and backed up by multiple machines. The camera can be programmed to send images only when certain events occur.
4, the image attenuation is small, the quality is guaranteed
The use of advanced digital compression technology, digital signal attenuation in the transmission of small, quality assurance. The analog video signal is transmitted over a longer distance, the signal will be attenuated, and video amplifier compensation needs to be configured.
　 5, stable and reliable
The network video server adopts the embedded operating system, the hardware adopts the high performance chip, and the work is stable.
6, can achieve wireless networking transmission
The network video server is used to convert the camera's video signal into a digital signal. In the case of inconvenient traffic and difficult wiring, the digital video signal can be sent to the monitoring center through the establishment of a wireless local area network, and then released by the monitoring center to the Internet for remote use. The management department watched. The advantages of wireless LANs are convenient networking, short cycle times, low investment, and flexible architecture.
Four basic features of network video server
With the development of network technology and the popularity of broadband networks, network video surveillance will gradually erode the market share of traditional video surveillance equipment. Here are four basic characteristics of video servers:
1, the model is small. Generally, it is usually 1-4 channels of analog video input. It will not move more than ten channels of video input like hard disk recorders, and it will not randomly carry hard disks. Placing storage devices at the monitoring center is more conducive to the storage and protection of image data. Save a lot of space.
2, simplicity. Through the rapid development of a cost-effective computer communication network to transmit video data to the monitoring center, only a low-cost type 5 network cable is required. If there is a WIFI module inside the video server and the wireless LAN is adopted, then there are five types of network cables. Network cables are saved.
3, a strong central 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 corresponding IP address of the video server to perform a full remote operation. Surveillance. Any authorized client can directly access any camera or access the monitored image through the central server.
4, easy to upgrade and full scalability. More cameras can be easily added, and the central server can easily be upgraded to faster processors, larger disk drives, and greater bandwidth in the future.
Network Video Server Advantages 1. Easy to install and maintain
Some people may say, "Now the network bandwidth is not enough, use optical fiber and optical fiber for remote transmission, video image quality and transmission speed is better than network transmission." However, the high cost of laying optical fiber and the complicated cabling project make it difficult for many customers and contractors to bear. Due to the popularization of computer networks, network monitoring systems can be constructed where there are networks, and installation costs are greatly reduced.
2, easy to use, want to see
Network monitoring is also not limited by time and place. It can monitor on-demand at any time, and can selectively view images at specified locations. Images that do not need to be viewed are not transmitted, saving network bandwidth resources.
3, with more intelligence
It can timely and automatically extract a large amount of information from the video stream. The information can be transmitted, saved, retrieved, stored offsite, and backed up by multiple machines. The camera can be programmed to send images only when certain events occur.
4, the image attenuation is small, the quality is guaranteed
The use of advanced digital compression technology, digital signal attenuation in the transmission of small, quality assurance. The analog video signal is transmitted over a longer distance, the signal will be attenuated, and video amplifier compensation needs to be configured.
　 5, stable and reliable
The network video server adopts the embedded operating system, the hardware adopts the high performance chip, and the work is stable.
6, can achieve wireless networking transmission
The network video server is used to convert the camera's video signal into a digital signal. In the case of inconvenient traffic and difficult wiring, the digital video signal can be sent to the monitoring center through the establishment of a wireless local area network, and then released by the monitoring center to the Internet for remote use. The management department watched. The advantages of wireless LANs are convenient networking, short cycle times, low investment, and flexible architecture.
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