-s, --stdout 将解码的音频采样写到标准输出，而不是通过音频设备。如果你的音频设备不支持mpg123的话，就必须使用这个选项。 -w file, --wav 将输出写到WAV格式的文件中。 -m, --mono, --mix, --signlemix Mix both channels / decode mono. It takes less CPU time than full stereo decoding. -C, --control Enable terminal control keys. By default use 's' or the space bar to stop/restart (pause, unpause) playback, 'f' to jump forward to the next song, 'b' to jump back to the beginning of the song, ',' to rewind, '.' to fast forward, and 'q' to quit. Type 'h' for a full list of available controls. -q, --quiet Quiet. Suppress diagnostic messages.