【作者】 王静；

【导师】 潘地林；

【作者基本信息】 安徽理工大学 ， 计算机应用技术， 2012， 硕士

【摘要】 近几年来,随着电视技术和多媒体技术的飞速发展,传统电视的单向式频道传输技术难以满足用户个性化的需求。随着互联网技术的不断成熟以及应用的不断普及,领域专家提出了网络电视这一全新的电视技术,即Internet Protocol Television,简称为IPTV。网络电视是一种集交互式与个性化服务为一体、利用互联网这一新兴载体传播电视媒体信息的技术,其主要功能是向广大观众提供音频或音视频同步的点播、在线或离线观看家庭娱乐节目、游戏、通信、互动广告等服务内容。本文分析了IPTV产生及其发展的背景、国内外目前研究的现状和系统组成等内容。IPTV主要由节目制作、内容管理、中心媒体服务、运营支撑、接入和用户终端等六大子系统组成；分析了IPTV中涉及到的主要技术,主要包括流媒体技术、数字版权管理技术、EPG技术、P2P技术、机顶盒技术、IPTV音视频编码技术和流媒体传输技术；详细分析了IPTV机顶盒的核心部件---嵌入式流媒体播放器的设计过程及实现方法。本文研究了基于Linux的嵌入式流媒体播放器的总体架构、功能模块的划分以及各子模块的设计与实现方法。最后,针对网络电视音视频不同步这一较常见的疑难问题,提出了音视频同步反馈系统,即二次同步的思想解决这一疑难问题。本文设计的IPTV机顶盒从同等网络带宽下的视频质量问题、P2P网络传输分享技术以及支持体感游戏等方面对传统机顶盒加以改进。经测试该播放器对于不同音视频编码方式,不同的分辨率以及不同的帧率均能正常播放,且能够播放高清分辨率的媒体文件。更多还原

【Abstract】 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.更多还原