The revision number relative to the oldest file with the given filename. 相对于具有给定文件名的最旧文件的修订号。0 gets you the oldest file, 1 gets you the 2nd oldest, -1 gets you the newest.0为您获取最旧文件，1为您获取第二旧文件，-1为您获取新文件。
0-based offset in bytes to start streaming from从0开始流式传输的偏移量（字节）
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0-based offset in bytes to stop streaming before之前停止流的基于0的偏移量（字节）