At least for YouTube, based on recent reports stemming from Chromecast and Chromecast Ultra use the Netflix account information stored on your Android or Apple mobile device, or the Netflix website on your Chrome browser. If you’re watching on an Apple TV, for instance, you can go to Settings > Video & Audio Format > Audio Format > Change Format and select Dolby Digital 5. Roku® Streaming Stick®+ Headphone Edition and its power cord easily hide behind your TV. If the entire app isn't playing sound, check the audio levels on the media player first, then on your devices. There is no documentation available and there seems to not be any way to adjust or sync audio and video between the TV and soundbar. The next steps will depend on your TV menu options: Select Display &Sound → Audio output → Digital audio out → PCM.(Links may not work, downloads have not been recently tested for safety) A new feature in Chrome radically improves the quality of video casted from the browser to your Chromecast-but only if you toggle a hidden setting on.
HBO Max can be used to stream content on up to three devices simultaneously. When HBO Max launched it came with support for Chromecast.