Type Property


The second track in the association is considered an appropriate default for the first track.


static let selectionFollower: AVAssetTrack.AssociationType


An association from one track to another specifying that when the user selects the first track, the second should be considered an appropriate default selection. For example, a follower for an audio track could be a subtitle track in the same language. When the user chooses a language for audio, the subtitle language “follows” the audio language selection.

See Also

Track Association Types

static let audioFallback: AVAssetTrack.AssociationType

The track contains the same content as another track, but in a more widely supported format.

static let chapterList: AVAssetTrack.AssociationType

The associated track contains chapter information for the base track.

static let forcedSubtitlesOnly: AVAssetTrack.AssociationType

The subtitle track containing forced and non-forced subtitles is associated with a subtitle track containing only forced subtitles.

static let metadataReferent: AVAssetTrack.AssociationType

The metadata track is associated with the track being described or annotated.

static let timecode: AVAssetTrack.AssociationType

The track is associated with a timecode track containing timing information for the original track.