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Allow the user to change the track

Here is an example of how a user can select a closed-caption track.
  1. To display the available closed caption tracks, use the MediaPlayerItem.closedCaptionsTracks property.
    var tracks = item.closedCaptionsTracks;
  2. To set which closed-caption track is current, use the MediaPlayerItem.selectClosedCaptionsTrack method.
  3. After the media player item is prepared, retrieve it from the media player by using the MediaPlayer. currentItem method.
    // Select the cc track with index k. 
    var item = mediaPlayer.currentItem;     
    var tracks = item.closedCaptionsTracks; 
    if (k >= 0 && k < tracks.length) {