The metadata written to the output file by the export session.
- iOS 4.0+
- macOS 10.7+
- tvOS 9.0+
The metadata is an array of
If the value of this key is
nil, any existing metadata in the exported asset will be translated as accurately as possible into the appropriate metadata key space for the output file and written to the output.
You can observe this property using Key-value observing.