Manipulate HTML5 video at X seconds from end of video

video-end-function.js

// Dynamically get the video length, and do something to a video X seconds before it ends
$('.video').on('timeupdate', function(event) {
  var timeFromVideoEnd = 2000;
  var current = Math.round(event.target.currentTime * 1000);
  var total = Math.round(event.target.duration * 1000);
  if ( ( total - current ) < timeFromVideoEnd ) {
    $body.addClass('fade-video-out');
  }
});