mozilla/popcorn-js — pull request #185 by brianchirls (2012-08-22 02:02:32+00:00)
Title: trackstart/trackend events emitted when tracks added, removed, enabled or disabled

Lighthouse ticket #1294
https://webmademovies.lighthouseapp.com/projects/63272/tickets/1294-trackstart-event-not-emitted-if-track-is-added-at-currenttime