The network video server is a special device that realizes audio and video data encoding and network transmission processing. It is composed of an audio and video encoder, a network interface, an audio and video interface RS422/RS485 serial interface, and an RS232 serial interface.
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 it is necessary to use mature coding technology to make the video data perform 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. At present, companies have already launched MPEG4 network video servers to meet the requirements of more 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. The NVS900 adopts DynamicStreamControl technology to ensure real-time transmission of two-way audio. The video frame rate is automatically adjusted according to the bandwidth, and the network connection 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, dome and other peripherals via communication lines.
The network monitoring video server can cooperate with the computer control software to realize the large-scale 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.
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