HTML Audio/Video DOM audioTracks Property

var vid = document.getElementById("myVideo");
function myFunction() {
  alert(vid.audioTracks.length);
}

Meaning

The audioTracks property returns an AudioTrackList object representing available audio tracks.

audio|video.audioTracks

Type	Description
AudioTrackList Object	Reruns the available audio tracks for the audio/video. The first available AudioTrack object is index 0. AudioTrackList Object: audioTracks.length - return the number of audio tracks available. audioTracks.getTrackById(id) - get audio track object by id. audioTracks[index] - access audio track object by index.
AudioTrack Object	Returns an audio track. AudioTrack Object Properties: id - get the id of the audio track. kind - get the type of the audio track (it can be: "alternative", "description", "main", "translation", "commentary", or "" (empty string)). label - get the label of the audio track. language - get the language of the audio track. enabled - get or set if the track is active (true\|false).

Type

Description

AudioTrackList Object

Reruns the available audio tracks for the audio/video. The first available AudioTrack object is index 0.

AudioTrack Object

Returns an audio track.

id - get the id of the audio track.
kind - get the type of the audio track (it can be: "alternative", "description", "main", "translation", "commentary", or "" (empty string)).
label - get the label of the audio track.
language - get the language of the audio track.
enabled - get or set if the track is active (true|false).