addTrackAssociation(withTrackOf:type:)
Adds an association between input tracks.
Declaration
func addTrackAssociation(withTrackOf input: AVAssetWriterInput, type trackAssociationType: String)Parameters
- input:
The input that contains the track to associate with this input’s track.
- trackAssociationType:
The type of track association to add.
Discussion
The system raises an error if the association type requires tracks of a media type that doesn’t match the input’s type, or if the output file type doesn’t support track associations.
You can’t add track associations after writing starts.