Razi@Tanasuks-MacBook-Pro Music  ffmpeg -i out4.m4a
ffmpeg version N-40926-g6374ee7 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jun 26 2012 13:10:49 with llvm_gcc 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.9.00)
  configuration: --enable-static --enable-shared --enable-gpl --enable-nonfree --enable-libmp3lame --enable-libaacplus
  libavutil      51. 53.100 / 51. 53.100
  libavcodec     54. 21.101 / 54. 21.101
  libavformat    54.  5.101 / 54.  5.101
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 75.100 /  2. 75.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out4.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 512
    compatible_brands: isomiso2
    title           : Sleazy
    artist          : Ke$ha
    album_artist    : Ke$ha
    composer        : Benjamin Levin/Kesha Sebert/Klas Åhlund/Lukasz "Dr. Luke" Gottwald/Shondrae Crawford
    album           : Cannibal [EP]
    date            : 2010
    encoder         : Lavf54.5.101
    genre           : Other
    track           : 3
  Duration: 00:03:25.79, start: 0.000000, bitrate: 64 kb/s
    Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 64 kb/s
    Metadata:
      handler_name    : SoundHandler
At least one output file must be specified