overallDurationHint
A hint to the total duration of fragments that currently exist or may exist in the future.
Declaration
static var overallDurationHint: AVAsyncProperty<Root, CMTime> { get }Discussion
Use the load(_:isolation:) method to retrieve the property value.
For QuickTime movie files and MPEG-4 files, the system obtains the value of this property from the mehd box of the mvex box, if present. If no total fragment duration hint is available, the value of this property is invalid.