$ ffprobe -print_format xml videoclip
ffprobe version N-38468-g268098d Copyright (c) 2007-2012 the FFmpeg developers
  built on Mar  2 2012 19:56:47 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
  configuration: --enable-nonfree --enable-libx264 --enable-gpl
  libavutil      51. 41.100 / 51. 41.100
  libavcodec     54.  6.100 / 54.  6.100
  libavformat    54.  2.100 / 54.  2.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 62.101 /  2. 62.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  7.100 /  0.  7.100
  libpostproc    52.  0.100 / 52.  0.100
<?xml version="1.0" encoding="UTF-8"?>
<ffprobe>
Input #0, avi, from 'videoclip':
  Duration: 13:39:34.84, start: 0.000000, bitrate: 0 kb/s
    Stream #0:0: Video: mpeg4 (Simple Profile) (DX50 / 0x30355844), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 29.97 tbn, 2997 tbc
    Stream #0:1: Audio: aac ([255][0][0][0] / 0x00FF), 44100 Hz, stereo, s16, 128 kb/s
</ffprobe>