The timestamp for the first timed data sample in the asset.
- iOS 9.0+
- macOS 10.11+
- tvOS 9.0+
- Model I/O
Timed data in an asset is clamped to the start and end times—requesting sample data for a time sample before the start time returns the sample data at the start time.
If the asset does not contain timed information, this property’s value is zero.