canContainFragments
A Boolean value that indicates whether you can extend the asset by fragments.
Declaration
static var canContainFragments: AVAsyncProperty<Root, Bool> { get }Discussion
Use the load(_:isolation:) method to retrieve the property value.
For QuickTime movie files and MPEG-4 files, the value is true if an mvex box is present in the moov box. For those types, the mvex box signals the possible presence of later moof boxes.