The HBO app passes Dolby Digital 5.1 perfectly on my setup, Netflix and
others do not, so it seem it is a fault with apps and not the Chromecast
with Google TV itself - but that is not of much use...
I was surprised to see that HBOMax on my Chromecast with Google TV
deliveres Dolby Digital 5.1 to my SONOS Playbar - Netflix and others do
not. So it seem to be possible...