Detecting whether a stream has audio or video

By default, a Subscriber object plays back both audio and video (if they are available). You can check if a stream has audio or video (if the publisher of the stream is streaming audio or video) by checking the hasAudio and hasVideo properties of the Stream object:

For example, when you subscribe to a stream, you may want to adjust the user interface based on whether the stream has audio or video. For example, you may want to indicate to the user whether a stream has audio or not; or you may not want to display a subscriber's view if a stream does not have video.