As a bit of helpful trivia, each application is initially opened with three file descriptors, 0 through 2, for the standard input, output, and error streams, respectively.
有一点不是很重要但却很有帮助，初始打开每个应用程序时，都具有三个文件描述符，从0到2，分别表示标准输入、输出和错误流。
Even if data is input and output as 8 - or 16-bit quantities, it is worth considering processing them as 32-bit quantities.
即使数据以8位或16位的形式输入或输出，把他们当作32位来处理仍是有意义的。
The input bit rate and the output frame rate of video decoder is fix, so a Rate Buffer is needed to balance this rate difference.
而经解码后显示的侦速率是恒定的，这就要求在解码端有一个缓冲器来实现输入码率与输出码率间的过渡。
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