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function getVideoMeta(videoUrl, metaType, callback) {
  var video = document.createElement('video');
  video.preload = 'metadata';
  video.src = videoUrl;
  video.addEventListener('loadedmetadata', function() {
    callback(null, video[metaType]);
  });
  video.addEventListener('error', function(error) {
    callback(error, video);
  });
}

getVideoMeta('http://video.webmfiles.org/big-buck-bunny_trailer.webm', 'duration', function(error, response){
  if (error) {
    console.log('Could not get video metadata.');
  } else {
    console.log('Video Duration: ' + response + ' seconds.');
  }
});