Downmix Audio Transcoding Option

I would like the ability to select an audio down-mixing option when viewing content and here’s why:

I own a Chromecast Ultra connected to a cheap projector via HDMI. The projector doesn’t support surround sound audio and there’s no way on the Chromecast Ultra to force stereo (I’ll send them a feature request too).

I’d like to be able to force stereo audio in this case so I can watch my content and hear it too in this scenario.

Thanks!

2022 clean-up: duplicate