ffprobe version N-61111-g7011aab Copyright (c) 2007-2014 the FFmpeg developers
  built on Mar 11 2014 11:47:32 with gcc 4.8.2 (GCC)
  configuration:
  libavutil      52. 66.101 / 52. 66.101
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.101 / 55. 33.101
  libavdevice    55. 11.100 / 55. 11.100
  libavfilter     4.  3.100 /  4.  3.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 18.100 /  0. 18.100
Input #0, m4v, from 'test.m4v':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mpeg4, yuv420p, 720x480 [SAR 1:1 DAR 3:2], 30 tbr, 1200k tbn, 30 tbc