how to record sound being played using arecord

[lou <loushanguan2015@sina.com>]

Could you give me commands that record sound being played?

i don't know how to use alsaloop

Can arecord use mp3 format?

Thanks!

  ~$ amixer
Simple mixer control 'Master',0
  Capabilities: pvolume pswitch pswitch-joined
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 65536
  Mono:
  Front Left: Playback 31609 [48%] [on]
  Front Right: Playback 31609 [48%] [on]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch cswitch-joined
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 65536
  Front Left: Capture 3479 [5%] [off]
  Front Right: Capture 3479 [5%] [off]

~$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0