gistfile1.txt

ffmpeg version 2.4.1 Copyright (c) 2000-2014 the FFmpeg developers
  built on Oct  5 2014 11:37:47 with Apple LLVM version 6.0 (clang-600.0.51) (based on LLVM 3.5svn)
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-vda --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid --enable-nonfree --enable-libfdk-aac --enable-libfaac
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  4.101 / 56.  4.101
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  1.100 /  5.  1.100
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
[aac @ 0x7f856401a000] Estimating duration from bitrate, this may be inaccurate
Input #0, aac, from 'background_music_aac.aac':
  Duration: 00:00:09.46, bitrate: 64 kb/s
    Stream #0:0: Audio: aac, 44100 Hz, stereo, fltp, 64 kb/s
At least one output file must be specified