[ Huaqiang Security Network News ] 
What is a video server?
The so-called network video server is an embedded device that compresses and processes video and audio data. It consists of video and audio compression encoder, input/output channel, network interface, video and audio interface, RS485/RS232 serial interface, protocol interface, software. Interface and other components.
With the continuous development of audio and video coding technology and the development of broadband network technology, the realization of video transmission becomes easier and lower, and the demand for video transmission is increasing. There are many network video server products on the market that meet the network transmission, including the cabinet and video server. This paper attempts to analyze the video server from the concept, composition, digital audio and video coding technology, network technology and features of the network video server in a simple language, so that it is easier for everyone to understand the network video server and select it.
What is the concept of a video server?
The network video server is a special device that encodes audio and video data and completes network transmission, thereby realizing remote monitoring. The audio and video server integrates audio and video data, organizes, edits, stores and collects them, and copies Blu-ray discs, DVDs and CDs into any complete data.
What is the composition of the video server?
The network monitoring video server is a special device for realizing audio and video data encoding and network transmission processing. It consists of an audio and video encoder, a network interface, an audio and video interface, an RS422/RS485 serial interface, and an RS232 serial interface.
Audio and video compression encoder: Since the amount of analog video data is very large, the amount of data is also large after digital-to-analog conversion. Therefore, it is necessary to use a mature coding technique to perform high compression ratio of video data under the technical specifications that meet the network transmission requirements. The encoding is to meet the transmission requirements. In the past, network video servers generally used encoders such as M-JPEG. Users could not achieve higher compression code rates, which were suitable for various network environments, and only achieved a general network transmission effect by reducing the frame rate. Companies have introduced MPEG4 network video servers to better enable video network transmission.
Network interface: Since the networking of the previous analog products mainly implements network transmission by establishing expensive independent optical fibers, the Ethernet interface of the network video server can conveniently implement IP networking and realize data transmission. The network video server mainly uses TCP/IP and other protocols to realize network transmission of audio and video data, control data and status detection information.
Audio and video interface: The network video server has a standard analog audio and video input interface to monitor the video signals of each channel. NetVision uses Dynamic Stream Control technology to ensure real-time transmission of two-way audio. The video frame rate is automatically adjusted according to the bandwidth, and the network is automatically connected after the interruption.
RS422/RS485 serial interface: The network video server has RS422/RS485 serial communication interface, which can be connected to various peripherals such as PTZ and Fastball through communication lines.
The network video server can be combined with the computer central control software to implement a large system networking solution. Some manufacturers network video servers provide an open SDK for users or third-party vendors to develop and build new application methods.
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