The useability and expandability are insufficient in digital multimedia surveillance systems. Most of them cannot be adapted to the fluctuation of available network bandwidth. To enhance the useability, the new surveillance structure was presented, which based on browser/server model and media-streaming system structure. To improve the expandability, the new surveillance software architecture was designed, which based on DirectShow architecture and component object model and combined unicast with multicast. To be adapted to the available network bandwidth dynamically, the adaptive control strategy and method was introduced, and the closed loop feedback transmission system was accomplished.
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