audioSourceName property
Specifies which audio data to use from each input. In the simplest case, specify an "Audio Selector":#inputs-audio_selector by name based on its order within each input. For example if you specify "Audio Selector 3", then the third audio selector will be used from each input. If an input does not have an "Audio Selector 3", then the audio selector marked as "default" in that input will be used. If there is no audio selector marked as "default", silence will be inserted for the duration of that input. Alternatively, an "Audio Selector Group":#inputs-audio_selector_group name may be specified, with similar default/silence behavior. If no audio_source_name is specified, then "Audio Selector 1" will be chosen automatically.
Implementation
final String? audioSourceName;