Returns an array of asset tracks associated with an asset for the specified characteristic.
- iOS 4.0+
- macOS 10.7+
- tvOS 9.0+
The media characteristic according to which receiver filters its asset tracks. For valid values, see
An array of
AVAsset objects of a specific media characteristic, or an empty array if no tracks with the specified characteristic are available.
You can call this method without blocking when the data in the
tracks property is already loaded.