Huh. Thanks for replying. I know I definitely have a 4K HDR television. Guaranteed. So maybe this is a disconnect between what my qled is reporting to the Chromecast.That warning only appears when you play HDR movie to non-HDR displays. My 4K rips are either both DV and HDR or just HDR and they play fine on my 4K TV in DV or HDR smoothly.
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Anyway, I put it back in the back bedroom with a 1080p tv. I had to go back to the fire TV 4K stick for the family room qled.