Creates a newly allocated timed metadata group adaptor for retrieving timed metadata group objects from an asset reader output.
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
It is an error to create a timed metadata group adaptor with an asset reader output that does not vend metadata. It is also an error to create a timed metadata group adaptor with an asset reader output whose asset reader has already started reading, or an asset reader output that already has been used to initialize another timed metadata group adaptor.
Clients should not mix calls to the
copy and the
next method. Once an
AVAsset instance has been used to initialize an
copy on that instance will result in an exception being thrown.