A new streaming media file format is suggested in this paper, and its characteristics and intentions are also elucidated.

本文提出了一种新的流媒体文件格式，给出了这种流媒体文件格式的框架并且阐明了其特点和用意。

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AS a streaming media format, ASF is the widely used in the distance learning. Each ASF file is composed of header object, data object and index object.

A SF文件格式是远程教育中使用较多的流媒体格式，A SF文件逻辑上由头对象、数据对象和索引对象组成。

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The content includes analyzing the file format, process of receiving streaming media data, synchronization of video and audio playing and so on.

内容包括本地媒体文件解析、多媒体数据网络接收过程、音视频同步播放等流程。

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