通常情况下，一个AVI文件可以包含多个不同类型的媒体流（典型的情况下有一个音频流和一个视频流），不过含有单一音频流或单一视频流的AVI文件也是合法的-normal circumstances, an AVI file can contain several different types of media flow (typical of a stream and an Audio Video Streaming ), but contain a single stream audio or v