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This paper presents a cost-efficient video multicast method for live video streaming to heterogeneous mobile terminals over a Content Delivery Network (CDN), where CDN consists of a video server, several proxies with wireless access points, and overlay links among the server and proxies. In this method, the original video sent from the server is converted into multiple versions with various qualities by letting proxies execute transcoding services based on the users' requirements, and delivered to mobile terminals along video delivery paths.
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