HTMLオーディオ/ビデオDOMaudioTracksプロパティ

利用可能なオーディオトラックの数を取得します。

var vid = document.getElementById("myVideo");
alert(vid.audioTracks.length);

定義と使用法

audioTracksプロパティは、AudioTrackListオブジェクトを返します。

AudioTrackListオブジェクトは、オーディオ/ビデオで使用可能なオーディオトラックを表します。

使用可能な各オーディオトラックは、AudioTrackオブジェクトで表されます。

Property
audioTracks	Not supported	11	Not supported	Not supported	Not supported

audio|video.audioTracks

Type	Description
AudioTrackList Object	Represents the available audio tracks for the audio/video. AudioTrackList Object: audioTracks.length - get the number of audio tracks available audioTracks.getTrackById(id) - get AudioTrack object by id audioTracks[index] - get AudioTrack object by index Note: The first available AudioTrack object is index 0
AudioTrack Object	Represents an audio track. AudioTrack Object Properties: id - get the id of the audio track kind - get the type of the audio track (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

Represents the available audio tracks for the audio/video.

AudioTrackList Object:

Note: The first available AudioTrack object is index 0

AudioTrack Object

Represents an audio track.

AudioTrack Object Properties:

id - get the id of the audio track
kind - get the type of the audio track (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)