| In recent years, with the rapid development of television technology and multimedia technology, it is hard to cater to individual needs of clients in one-way transmission of traditional television. As uninterrupted perfection of Internet technology and the gradual popularization of application, specialists from this area of expertise promote a brand new television technology:Internet Protocol Television, Which is short for IPTV. IPTV, integrating interaction and personalization of service, mainly provides audio or video on command, family entertainment watching online or offline, gaming, communicating, interactive advertisement and other services, by utilizing a totally new method of the carrier of information:Internet.This dissertation has analyzed the background of emergence and development, status survey of domestic and overseas research and organization of the system. IPTV consists of six subsystems which is production of program, management of content, service of central media, operational support, access, and client. Efforts are devoted to analyze the principal technology involved in IPTV, including stream media technology, Digital Rights Management technology, EPG technology, peer-to-peer technology, set-top box technology, audio and video encoding technology and stream media transmission technology. Embedded stream media player, the core component of IPTV set-top box, is discussed about its process of design and method of implementation as well as the general framework, division of function modules, and design and implementation of sub-module respectively. Finally, asynchronous play of audio and video, a problem which is frequently encountered in IPTV, is resolved by the promotion of the synchronization feedback system of audio and video, which is inspired by the idea of secondary synchronization.Modified IPTV set-top box, designed by this dissertation, improves the quality of video under the same network bandwidth, peer-to-peer network transmission share technology and somatic game supporting, by contrast to the traditional set-top box. After testing, it is confirmed that this player supports these very formats with different method of encoding audio and video, different resolution, and different frame rate, particularly, as well as HD resolution media files. |
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