Adds or extends an empty time range within all tracks of the composition.
- iOS 4.0+
- macOS 10.7+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 6.0+
The empty time range to insert.
If you insert an empty time range into the composition, any media that was presented during that interval prior to the insertion will be presented instead immediately afterward. You can use this method to reserve an interval in which you want a subsequently created track to present its media.