Global Variable


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


const AVTrackAssociationType AVTrackAssociationTypeTimecode;

See Also

Track Association Types


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


The associated track contains chapter information for the base track.


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


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


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

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

Learn more about using Apple's beta software