Yeah, eARC can carry more than ARC (which is pretty much just toslink over HDMI). It should have enough capacity to carry the full-decoded 5.1 channel PCM. That said, I am not sure this ends up workin...
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Yeah, eARC can carry more than ARC (which is pretty much just toslink over HDMI). It should have enough capacity to carry the full-decoded 5.1 channel PCM. That said, I am not sure this ends up working perfectly for every TV, so it may not be a guarantee of success. But, I have my CCU plugged into my receiver, and that works quite well for me, so I don't have to worry about potential eARC compatibility issues. The receiver just needs to support multi-channel PCM coming in from the CCU over HDMI. Most receivers that support HDMI should have no trouble with that. ARC/eARC runs over HDMI as well, but it's in the reverse direction (coming from the TV), so when you connect the CCU directly to the receiver, ARC/eARC aren't in play. I haven't found any official documentation on what audio codec Stadia uses, but I have seen an analysis that claims it uses Opus, a scalable open codec that supports low latency (which is an important consideration for Stadia compared to pre-encoded content like Netflix).