Shanghai Metro has a history of more than 10 years since its initial construction. According to the current plan, large-scale construction will continue until 2010. During this process, video surveillance has undergone a transformation from analog to digital and has developed rapidly in the digital field. In addition to the traditional analog method, Shanghai Metro\'s video surveillance also uses MJPEG, H.261, MPEG2, and MPEG4 (or so-called H.264) used in DVR. For the upper network of Shanghai Metro to be built, its video surveillance must be able to share all built and unbuilt subway lines and be able to use the most advanced and stable digital technology that is suitable for the future development direction of video. The solution of sharing the videos of various subway lines after secondary digital-to-analog conversion into the upper network should be listed as the last choice because of the large loss of video (see attachment: discussion on issues related to MPEG2 and multiple digital-to-analog conversion). This article will focus on how to achieve the conversion and sharing of video formats in the digital field and how to adapt to and make full use of the rapidly developing video compression technology.
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