ffmpeg version 2.3.1 Copyright (c) 2000-2014 the FFmpeg developers
  built on Aug 12 2014 17:09:01 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
  configuration: --prefix=/opt/boxen/homebrew/Cellar/ffmpeg/2.3.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  libavutil      52. 92.100 / 52. 92.100
  libavcodec     55. 69.100 / 55. 69.100
  libavformat    55. 48.100 / 55. 48.100
  libavdevice    55. 13.102 / 55. 13.102
  libavfilter     4. 11.100 /  4. 11.100
  libavresample   1.  3.  0 /  1.  3.  0
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 19.100 /  0. 19.100
  libpostproc    52.  3.100 / 52.  3.100
[mp3 @ 0x7f906081fa00] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from 'test.mp3':
  Duration: 00:01:30.07, start: 0.000000, bitrate: 320 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
Output #0, mp3, to 'chunk_000002.mp3':
  Metadata:
    TSSE            : Lavf55.48.100
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, 320 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=    1174kB time=00:00:30.00 bitrate= 320.4kbits/s
video:0kB audio:1172kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.090706%