Like Dolby Vision, HDR10+ uses "dynamic metadata" that's encoded into scenes ahead of time, as opposed to the fixed metadata in HDR10. That'll allow an HDR10+ TV to adjust brightness on a "scene-by-scene or even frame-by-frame basis," Samsung says. Samsung has avoided Dolby Vision, but most other manufacturers including Sonyand TCL have opted in. That sounds very similar to how Dolby describes its tech, and as with Dolby Vision, HDR10+ metadata will have to be baked into content before TVs can decode it. Dolby Vision is backwardly compatible to HDR10, but it's not clear if it will work with the new standard.
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Dynamic metadata is a particularly important addition in HDR10+ as it closes the gap between the open HDR standard and the closed Dolby Vision spec, which had previously touted dynamic metadata as one of its main differentiators over the original HDR10 standard. Samsung and Amazon have announced a new open standard for high dynamic range video called HDR10+. In terms of content, Amazon Video is set to support HDR10+ later this year, but its the only major company signed on so far. And of course, I'd be remiss in noting that unfortunately, the addition of HDR10+ now marks the fifth major HDR standard vying for industry support, along with the original HDR10, Dolby Vision, HLG, and Advanced HDR, because clearly four different versions were not quite enough for anyone yet. Which is ultimately a good thing for consumers looking to avoid complicated hardware decisions, but also means that what we actually refer to as "HDR video" is going to refer to an increasingly wider range of things.
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