Some versions of Android don't dispatch a video ended event. Monitor timeupdate and ended events using Rx.js to determine when either one happens.

videoended-rx.js

//
//  Android you suck. Some of your versions don't dispatch
//  a video ended event. So the player just hangs on the last frame.
//

// Observables from video element events
var timeObs = Rx.Observable.fromEvent(videoEl, 'timeupdate');
var endedObs = Rx.Observable.fromEvent(videoEl, 'ended');

var endOfVideoByTimeObs = timeObs
  // only new values please
  .distinctUntilChanged()
  // transform to the current time value
  .map(function(x, idx, obs) {
    return Math.floor(x.currentTarget.currentTime); 
  })
  // not interested while it is less than duration
  .skipWhile(function(x) {
    return x < Math.floor(videoEl.duration);
  })
  // allow the real `'ended'` event to dispatch with this arbitrary buffer value
  .delay(500);

// now we know when a video has ended, whether the `'ended'` event is 
// actually dispatched from the video element or by our excellent time
// value comparisons.
endedObs.merge(endOfVideoByTimeObs).take(1).subscribe(
  function(x) {
    console.log('Signal onNext: value', x);
  },
  function(err) {
    console.log('Signal onError: ', err);
  },
  function(x) {
    console.log('Signal onCompleted.');
  });