i 视频会议系统 技术方案 2010-12-20 i 目 录 第1 章 项目需求分析 .............................................................................................. 1 1.1 项目背景 ........................................................................................................ 1 1.2 本次建设要求 ................................................................................................. 1 1.3 建设达到目的 ................................................................................................. 1 1.4 承载网络分析 ................................................................................................. 1 第2 章 视频会议行业背景 ....................................................................................... 3 2.1 概述 ................................................................................................................ 3 2.2 H.264 成为主流编码标准 .................................................................................. 4 2.2.1 H.261 视频编码 ...........................................................................................4 2.2.2 H.263 视频编码 ...........................................................................................5 2.2.3 H.264 视频编码 ...........................................................................................5 2.3 宽带音频成为共同的追求 ............................................................................... 5 2.3.1 G.711 基本音频 ...........................................................................................5 2.3.2 G.711 ..........................................................................................................5 2.3.3 G.722、G.722.1 ............................................................................................6 2.3.4 G.722.1 Annex C ...........................................................................................6 2.3.5 G.719 .................