The techniques described herein relate to methods, apparatus, and computer readable media configured to encode and decode multimedia data. A hierarchical track structure for the multimedia data is encoded with at least a first track and a second track, wherein the second track is above the first track. Overlay composition metadata is associated with the second track, wherein the overlay composition metadata comprises offset metadata, layer metadata, source metadata, or some combination thereof. The overlay composition metadata specifies at least part of an overlay composition for media data associated with the first track, wherein the overlay composition can be performed as part of a track derivation operation on media data associated with the first track to generate media data of the second track, such that the second track is a derived track of the first track.