get youtube vid lengths with jquery promises

gistfile1.txt

  
    //Getting length of the youtube vids...
$('#yt_player_container').on("onPlayerReady", (msg) => {
  $.when().then(delay(1000)).then(() => {
  _.toArray(window.talk_metadata)
    .reduce((seq, talk) => seq.then(() => {
       return new Promise((res, rej) => {
          const cb = ({event}) => {
            if (event == YT.PlayerState.PLAYING) {
              stopVideo();
              $('#yt_player_container').off("onPlayerStateChange", cb);
              setTimeout(() => res("ok"), 2000)
              console.log("vidid", talk.fullName, "duration", window.player.getDuration());
            }
          }
          $('#yt_player_container').on("onPlayerStateChange", cb);
          window.player.loadVideoById(talk.videoId);
        });
    }), Promise.resolve());
  })
  .fail(e => console.log("err", e));
});