Linux下从声卡内录成mp3文件

1)获取 monitor 的名字(如下红色字体中MonitorSource:后面的内容): 
$ pactl list | grep monitor
Monitor Source:alsa_output.pci-0000_00_1b.0.analog-stereo.monitor

2)设置这个monitor的静音项为false:
$pacmd
>>>set-source-mutealsa_output.pci-0000_00_1b.0.analog-stereo.monitorfalse

3) 用Lame命令配合录音:
$ parec --format=s16le--device=alsa_output.pci-0000_00_1b.0.analog-stereo.monitor| lame -r - MyRecord.mp3