subject: Technical Article: Streaming Media On Video Surveillance Application [print this page] Streaming media refers to Internet data streams on the way to real-time audio and video multimedia content, media, and streaming media Technology Is published in the IP network, multimedia streaming technology. It changed the traditional image of the Internet's dull, rich functions of the Internet has become a strong attraction of new media. It is widely used News Publishing, securities, entertainment, electronic commerce, remote training, video conferencing, distance learning, telemedicine and other Internet information services, and will Network Information Bring about revolutionary changes in the exchange. This article describes the meaning of streaming media technology and features, working principle and system components, transmission and mainstream formats, as well as its Network Video Monitoring system applications.
As streaming media technology a breakthrough to some extent, the network bandwidth limitations of multimedia messaging, it is widely used in remote education, remote medical services, press releases, web Advertisement , E-commerce, video on demand, video conferencing, video surveillance and other areas, and will revolutionize information exchange network.
China's 863 high-tech research program, "high-performance information demonstration network 3Tnet" in broadband streaming media clearly from the typical business start, such as the establishment of a media stream to adapt to InternetTV real-time transmission of high-performance, wide-area (city domain) broadband demonstration network 3Tnet. In addition to broadband network, streaming media technology can be widely used in other networks, such as wireless media streaming application is one of the major 3G network. In the NGN network, streaming media also play an important role.
As streaming media technology and networks are closely related, the application of video surveillance network should be digital video surveillance, this monitoring system, the video collection Video camera And video transmission network and control center components. It uses digital video processing technology as the core, combined with network technology, streaming media technology, multimedia technology, completely overcome the shortcomings of analog control, fully networked digital video surveillance advantages. Also, set the video switching, intelligent control, remote transmission, deployed Alarm Functions in one, and support multiple wired and wireless transmission medium.
Because users vary the rate of Internet access, streaming media, if a fixed rate for streaming transmission rate will limit the release media of low quality, high-speed connection will limit the number. Typically, the use of smart technology to solve the bandwidth flow coordination, specifically in two ways:
First, establish a code framework that allows multiple streams of different rates while coding, and merge into a single file can be extended to create a streaming file, known as intelligent stream file;
Second, using a client / server mechanism to detect the bandwidth change. When a client makes a request, the bandwidth capacity will be passed to the server, media server and then the bandwidth according to the customer will file the appropriate part of the intelligence stream transmitted to the user, so users can get the current link conditions, the quality of the highest quality media. Intelligent flow changes by describing the Internet, bandwidth to send high-quality media features, the hybrid link Environment The contents of the authorization to provide a solution.
In fact, the streaming media technology that will handle video and audio files compressed after the section on the web server on the transmission, and the client computer will not need to download the video and audio files to a local, he may listen to and watch.
As a result of streaming media technology, the signal transmission with real-time (ie, real-time video signal processing, such as real-time compression, decompression, real-time transmission, etc.), synchronization (although the video signal is distributed, but the user terminal display to be synchronized), distribution (for on-site collection of images, transmission, reception, show hosts in different locations, and finally through the network connected) and so on.
Video transmission dependent on the communications network, including LAN, WAN, ISDN, DDN, ATM, PSTN, etc., because each network transmission control and communication protocols are different, and therefore suitable for remote monitoring of digital video transmission requirements are also different.
