A key to access the dictionary of compression properties for a video asset.
- iOS 4.0+
- macOS 10.7+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
The value for this key is an instance of
NSDictionary. Add entries to this dictionary to manually change bit rate, B-frame delivery, I-frame interval, and codec quality. Querying the
supported method reveals the keys supported for the current release and configuration.