The average throughput, in bits per second, required to play the stream, as advertised by the server.
- iOS 10.0+
- macOS 10.12+
- Mac Catalyst 13.0+
- tvOS 10.0+
- watchOS 3.0+
The property corresponds to "sc-indicated-avg-bitrate".
The value of this property is negative if unknown.
This property is not compatible with Key-value observing.