HTML5 <audio> textTrack.kind=subtitles cueChange event not working in FireFox

Question

UPDATE:

This issue no longer existing FireFox, cuechange now works. Embedded base64 images also render.

The original code is a simple implementation of am

Answer 1

Firefox still (!) doesn't support oncuechange (as of v38.0, May 2015). However, you can usually use video.ontimeupdate to achieve almost exactly the same thing, e.g.:

var videoElement = $("video")[0];
var textTrack = videoElement.textTracks[0];
if (textTrack.oncuechange !== undefined) {
  $(textTrack).on("cuechange", function() { ... });
} else {
  // some browsers don't support track.oncuechange, so...
  $(videoElement).on("timeupdate", function() { ... });
}