修改滚动条样式，增加音频缓冲选项。
Modifies style of scroll bar, and adds option of audio buffer length.
第三个少的参数是缓冲选项，如果有缓冲问题则需要该选项。
The third missing parameter is the buffer option that may be needed if you have buffering problems.
缓冲选项 -bufsize 用来设置缓冲区的大小，单位为比特。
The buffer option is -bufsize to set the buffer size in bits.
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