scalingBehavior property
Specify how the service handles outputs that have a different aspect ratio from the input aspect ratio. Choose Stretch to output (STRETCH_TO_OUTPUT) to have the service stretch your video image to fit. Keep the setting Default (DEFAULT) to have the service letterbox your video instead. This setting overrides any value that you specify for the setting Selection placement (position) in this output.
Implementation
final ScalingBehavior? scalingBehavior;