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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 encoders, input/output channels, network interfaces, video and audio interfaces, RS485/RS232 serial interfaces, protocol interfaces, and software. Interfaces, etc.
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 the cost is lower, so that the demand for video transmission is increasing. There are many network video server products on the market that meet the needs of network transmission, including video cabinets and video and audio servers. This article tries to use a simple language to analyze the video server from the aspects of the concept, composition, digital audio and video coding technology, network technology and characteristics of the network video server, so as to make it easier for everyone to understand and select the network video server.
What is the concept of video server
The network video server is a special device that encodes and processes audio and video data and completes network transmission, thereby realizing the function of remote monitoring. The video and audio server sets audio and video data to organize, summarize, edit, store, and store in one, and freely copies Blu-ray discs, DVDs, and CDs into complete data.
What is the composition of the video server?
The network monitoring video server is a special device that realizes audio and video data encoding and network transmission processing. It is composed of audio and video encoders, network interfaces, audio and video interfaces, RS422/RS485 serial interfaces, and RS232 serial interfaces.
Audio and video compression encoder: As the amount of analog video data is very large, the amount of data after conversion through digital-to-analogue is also very large, so to use mature coding technology, the video data is subjected to high compression ratio under the technical indicators that meet the requirements of network transmission. Coding to meet transmission requirements. Previous network video servers generally used M-JPEG and other encoders, users can not achieve a higher compression rate, suitable for a variety of different network environments, can only achieve the effect of a general network transmission effect by reducing the frame rate. All companies have already launched MPEG4 network video servers to meet the requirements of video network transmission.
Network Interface: Since the networking of previous analog products is mainly implemented through the establishment of expensive and independent optical fibers to realize network transmission, the Ethernet interface of the network video server can easily implement IP networking and achieve data transmission. The network video server mainly adopts protocols such as TCP/IP to realize network transmission of data such as audio and video data, control data, and status detection information.
Audio and video interface: Network video server with standard analog audio and video input interface, easy to monitor the video signal of each channel. NetVision uses DynamicStreamControl technology to ensure real-time transmission of two-way audio. The video frame rate is automatically adjusted according to the bandwidth. After the network is disconnected, it is automatically connected.
RS422/RS485 serial interface: The network video server has RS422/RS485 serial communication interface, which can be connected to various peripherals such as PTZ, dome and other peripherals via communication lines.
The network video server can cooperate with the computer control software to realize the large system networking program. Some manufacturers' network video servers provide an open SDK for users or third-party vendors to develop and construct new application methods.
What is the concept and composition of video server
Network video server is an embedded device that compresses and processes video and audio data. It consists of video and audio compression encoders, input and output channels, network interfaces, video and audio interfaces, RS485 RS232 serial interfaces, protocol interfaces, and software interfaces.