Network video server technology and development trends (1)

Network video server is a way to encode audio and video data processing and complete the network of specialized equipment. The current market for network video server now have used M-JPEG, MPEG4, H264, and other coding techniques to encode the video data.

The composition of the network video server

Network video server is an implementation of audio and video data, coding, network transmission and processing of special equipment, audio and video encoders, network interfaces, audio/video interface, RS422/RS485 serial interface, RS232 serial interface, etc.

Audio and video compression encoder: as analog video data volume is very large, through analog conversion, data volume is large, so you want to use sophisticated coding technology, the video data to meet the requirements of the network transmission specification for encoding of high compression ratio, to meet the transport needs.

The previous network video server generally use M-JPEG, encoder, user unable to achieve higher compression rate, suitable for all kinds of different network environments, can only reduce the frame rate to achieve the effect of the network effect. At present the company has launched a MPEG4 network video server to better video network transmission requirements.

Network interface: as the previous simulation products are mainly of networking through the establishment of expensive network independent fiber optic transmission network video server's Ethernet interface can easily realize IP networking, data transfer.

Network video server mainly uses TCP/IP and other protocols realizing audio and video data, control data and data such as stateful inspection information network transfers.

Audio/video interface: network video server with standard analog audio and video input connector, easy to monitor all channels of video signal.

Using Dynamic Stream Control technology guarantee two-way real-time transmission of audio, video frame rate according to the bandwidth automatically adjust, network outages after the automatic connection technology.

RS422/RS485 serial interface: network video server with RS422/RS485 serial communication interface, available through communication line external such as PTZ and dome and other peripherals.

Network video server can be used with computer-controlled software realization of large-scale systems networking programme, some manufacturers provide network video server, open the SDK for users or third-party manufacturers to develop and build new applications.

Network video server commonly used technology

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1.M-JPEG

M-JPEG as a digital compressed format, from the analog to digital, from video to the hard disk recorders, M-JPEG bring us a brand new digital broadcasting means that signal into data, you should run M-JPEG compression technology in video compression occurs with landmark significance.

M-JPEG is based on the frame, the frame independent compression method, so relative to later emerge MPEG-4, H.264 compression, data volumes, transport difficulties, so the coding network video server has been largely unable to meet demand, now remote monitoring can only be used for the product.

2.MPEG-4

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