Type Property


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


static let metadataReferent: AVAssetTrack.AssociationType


This track association is optional for AVAssetTrack objects with the media type metadata. When a metadata track lacks this track association, its contents are assumed to describe or annotate the asset as a whole.

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 selectionFollower: AVAssetTrack.AssociationType

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

static let timecode: AVAssetTrack.AssociationType

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