流文件MP4文件的核心技术  

A Survey on the Core Technologies of MP4

作　　者：郑翔[1] 周秉峰[1] 叶志远[1] 司端锋[1] 方喜锋[1] 

机构地区：[1]北京大学计算机科学技术研究所

出　　处：《计算机应用》2004年第5期76-79,共4页journal of Computer Applications

基　　金：中国博士后研究基金 (2 0 0 3 0 3 3 0 77)

摘　　要：在MPEG4标准中,包括场景信息、对象信息、管理控制信息等信息都是以二进制形式进行编码并存放在流文件MP4中。MP4文件包含了与媒体数据时间序列相关的时间、结构、媒体信息(例如音频/视频表达文件),并通过轨道将它们联系在一起。本文重点介绍流文件MP4中的下列关键技术:与创建MP4文件相关的场景描述、对象描述、场景描述与对象描述之间的关系以及MP4流文件的组成机制和基于网络播放MP4流文件机制等,并基于MP4文件格式实现了汉字显示技术,这些内容有助于在实际研究中创建MPEG4流文件和应用MPEG4流技术。All information including scene,object and management control in MPEG4 standard is encoded into binary format and saved into one streaming file named .MP4 in streaming format. One MP4 file consists of timing,structure,media information such as video and audio express which are related to the timing sequence of the file media data,and are connected with each other by track technology. This paper surveys the core technologies of MP4 file including scene description,object description,the correlation between scene description and object description,and the constituent method and play technology over network for MP4 file. At last,it gives an example which realizes Chinese display according to MPEG4 bit stream standard. Those are helpful on building MPEG4 streaming file and using MPEG4 streaming over local and network.

关 键 词：MP4流文件 场景描述 对象描述 轨道 文件格式 

分 类 号：TP37[自动化与计算机技术—计算机系统结构]