HTMLオーディオ/ビデオDOMvideoTracksプロパティ

利用可能なビデオトラックの数を取得します。

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

定義と使用法

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

VideoTrackListオブジェクトは、ビデオで使用可能なビデオトラックを表します。

使用可能な各ビデオトラックは、VideoTrackオブジェクトで表されます。

Property
videoTracks	Not supported	Not supported	Not supported	Not supported	Not supported

video.videoTracks

Type	Description
VideoTrackList Object	Represents the available video tracks for the video. VideoTrackList Object: videoTracks.length - get the number of video tracks available in the video videoTracks.getTrackById(id) - get VideoTrack object by id videoTracks[index] - get VideoTrack object by index videoTracks.selectedIndex - get the index of the current VideoTrack object Note: The first available VideoTrack object is index 0
VideoTrack Object	Represents a video track. VideoTrack Object Properties: id - get the id of the video track kind - get the type of the video track (can be: "alternative", "captions", "main", "sign", "subtitles", "commentary", or "" (empty string)) label - get the label of the video track language - get the language of the video track selected - get or set if the track is active (true\|false)

Type

Description

VideoTrackList Object

Represents the available video tracks for the video.

VideoTrackList Object:

Note: The first available VideoTrack object is index 0

VideoTrack Object

Represents a video track.

VideoTrack Object Properties:

id - get the id of the video track
kind - get the type of the video track (can be: "alternative", "captions", "main", "sign", "subtitles", "commentary", or "" (empty string))
label - get the label of the video track
language - get the language of the video track
selected - get or set if the track is active (true|false)