title: Getting video dimension / resolution / width x height from ffmpeg
body: <p>How would I get the height and width of a video from <code>ffmpeg</code>'s information output. For example, with the following output:</p>
  
  <pre><code>$ ffmpeg -i video.mp4
  ...
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
    Metadata:
      major_brand     : isom
      minor_version   : 1
      compatible_brands: isomavc1
      creation_time   : 2010-01-24 00:55:16
    Duration: 00:00:35.08, start: 0.000000, bitrate: 354 kb/s
      Stream #0.0(und): Video: h264 (High), yuv420p, 640x360 [PAR 1:1 DAR 16:9], 597 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc
      Metadata:
        creation_time   : 2010-01-24 00:55:16
      Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 109 kb/s
      Metadata:
        creation_time   : 2010-01-24 00:55:17
  At least one output file must be specified
  </code></pre>
  
  <p>How would I get <code>height = 640, width= 360</code>?</p>