Ok, I have the same problem. Something is extremely fishy with Stadia and Dolby Digital 5.1. I've a Samsung UE49NU7179N. This TV has an optical out (toslink) and a HDMI ARC compatible port. My CCU...
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Ok, I have the same problem. Something is extremely fishy with Stadia and Dolby Digital 5.1. I've a Samsung UE49NU7179N. This TV has an optical out (toslink) and a HDMI ARC compatible port. My CCU is connected to this port and I've activated HDMI-CEC (anynet+), because ARC only works with activated CEC. Furtheremore I've connected my ~15 year old Yamaha AV Receiver over toslink with the tv. The receiver does not support DD+ and does not have any HDMI ports. As Sound output I select "Audio Out/Optical" at the TV. If I cast Netflix to the CCU, I can select the Dolby Digital Audio Stream and everything works as it should. I also see in the TV menu under Sound => Expert Settings, that the Digital Output Audio Format "Dolby Digital" was selected, not PCM (I could manually select PCM, though). With Stadia this will not work. After I've started a game, the connection status information show me, that 5.1 surround sound is on, but my AV receiver does not switch to Dolby Digital. In the TV menu I can't select Dolby Digital, only PCM is present. I've tried the to force the surround sound in the app to ac3 or ac3/eac3, but this will not help. The receiver always gets only the PCM stream and thats not a Dolby Digital Surround Sound at all. The Chromecast Ultra support Dolby Digital, e.g. in Netflix, but Stadia don't or only support other, non Dolby Codecs? I don't get it...