选择一个预设值即选择一套内置的编码选项，其中一些选项只会影响编码速度，而另外一些选项则会影响解码速度。
Each preset selects a set of internal encoder options. Some of them affect only the encoding speed, the others also the decoding speed.
选择一个预设值即选择一套内置的编码选项，其中一些选项只会影响编码速度，而另外一些选项则会影响解码速度。
Each preset selects a set of internal encoder options. Some of them affect only the encoding speed, the others also the decoding speed.
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