The mobile verison supports "Audio only", but not at Browsers or App on Desktop. While Data-Usage shouldn't be problem on PC - but it actually might - in addition, Twitch uses an non-insignificant amount of CPU-power, which could also benefit from that option (i.e. of Talk Shows, Podcasts, ASRM, Music Streams, ...).
I see no point, to exclude this feature on PCs.
Should be easy to add as Twitch already has audio-only option in the Android app (and youtube-dl confirms that there is in fact an audio-only stream available), however it's not available as an option in the Web UI.
Hello. Many people watch a stream in the background. They listen more than they watch. For weak computers and a weak Internet, it will be good if the “audio only” mode is added when the video is completely turned off. This mode is interesting to me from PC, not to mention those who listen to streams from phones. Thank you for understanding!
This would be pretty much the mirror opposite to watching a muted stream. In the stream resolution settings there would be an option to turn video output off and only listen to the audio (in high quality).
This would be really useful for people with low internet speed (also to reduce the use of bandwidth when a lot of people are accessing the service) or who want to do other resource demanding tasks that could otherwise suffer from having a high resolution stream run in the background.