OnAdaptationEvent not firing when selectTrack changes tracks

[ajbeach2]

This JS fiddle demonstrates the issue. When you select a different resolution, there is no event fired when selectTrack is called with a new track. In the js fiddle, click the 1080p and 144p buttons to change resolution. OnAdaptationEvent is only fired once, but it doesn't appear to be triggered when the track is changing via the 1080p and 144p buttons. Is this the expected behavior? I need to trigger events when a new track is selected.

https://jsfiddle.net/yh95LL4o/15/

var manifestUri = 'https://yt-dash-mse-test.commondatastorage.googleapis.com/media/car-20120827-manifest.mpd';

function jump(to){
    var video = document.getElementById('video');
  video.currentTime = to;
}

function resolution(height){
    var player = window.player
  var tracks = player.getTracks()
  track = tracks.find(function(x){if(x.height === height){return x}});
    player.selectTrack(track, true)
}

window.resolution = resolution;
window.jump = jump;

function initApp() {
  shaka.polyfill.installAll();
  shaka.Player.support().then(function(support) {
    if (support.supported) {
      initPlayer();
    } else {
      console.error('Browser not supported!');
    }
  });
}

function initPlayer() {
  var video = document.getElementById('video');
  var player = new shaka.Player(video);
  window.player = player;
  player.addEventListener('error', onErrorEvent);
  player.addEventListener('adaptation', onTrackChanged);

  player.load(manifestUri).then(function() {
    console.log('The video has now been loaded!');
  }).catch(onError);  // onError is executed if the asynchronous load fails.
}

function onErrorEvent(event) {
  onError(event.detail);
}

function onTrackChanged(event){
  alert("track changed!")
}

function onError(error) {
  console.error('Error code', error.code, 'object', error);
}

initApp();

[joeyparrish]

Yes, this is intended behavior. The event fires when there's an automatic adaptation, but not a manual one. Presumably, if you call the method to change tracks, you know you've called it. Also, choosing a track manually disables ABR, so an adaptation event (which signals that the ABR system has made a decision) wouldn't make much sense.

I can see, though, that the docs are not very clear on these points. I will update them.

[joeyparrish]

The docs have been updated. Hope that helps!