AudioTrack: label property

A string specifying the track's human-readable label, if one is available in the track metadata. Otherwise, an empty string ("") is returned.

For example, a track whose kind is "commentary" might have a label such as "Commentary with director Mark Markmarkimark and star Donna Donnalidon".

This example returns an array of track kinds and labels for potential use in a user interface to select audio tracks for a specified media element. The list is filtered to only allow certain track kinds through.

function getTrackList(el) {
  const trackList = [];
  const wantedKinds = [
    "main",
    "alternative",
    "main-desc",
    "translation",
    "commentary",
  ];

  el.audioTracks.forEach((track) => {
    if (wantedKinds.includes(track.kind)) {
      trackList.push({
        id: track.id,
        kind: track.kind,
        label: track.label,
      });
    }
  });
  return trackList;
}

The resulting trackList contains an array of audio tracks whose kind is one of those in the array wantedKinds, with each entry providing the track's id, kind, and label.