root@EncoderLinux01:~# ffmpeg -f alsa -ac 2 -i hw:0,1 -acodec pcm_s16le output.wav
ffmpeg version git-2012-06-27-b536e2f Copyright (c) 2000-2012 the FFmpeg developers
  built on Jun 27 2012 05:48:11 with gcc 4.6.1
  configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3 --enable-x11grab --enable-libpulse
  libavutil      51. 63.100 / 51. 63.100
  libavcodec     54. 29.101 / 54. 29.101
  libavformat    54. 11.100 / 54. 11.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     3.  0.100 /  3.  0.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
[alsa @ 0x2a061c0] cannot open audio device hw:0,1 (No such file or directory)
hw:0,1: Input/output error
root@EncoderLinux01:~# arecord -l
**** List of CAPTURE Hardware Devices ****
card 1: Bt878 [Brooktree Bt878], device 0: Bt87x Digital [Bt87x Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: Bt878_1 [Brooktree Bt878], device 0: Bt87x Digital [Bt87x Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 3: Bt878_2 [Brooktree Bt878], device 0: Bt87x Digital [Bt87x Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 4: Bt878_3 [Brooktree Bt878], device 0: Bt87x Digital [Bt87x Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
root@EncoderLinux01:~#