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Very little content available via streaming services is actually in 4K, much less 4K HDR. And when it is available, the content maker might not have done a good job of creating it. The guy who originally posted he could not tell the difference might be thinking he is watching 4K HDR even though most of what he is likely watching isn't HDR, and most of it isn't even 4K. Just because one has a 4K HDR capable TV doesn't mean that everything gets magically converted to 4K HDR, but some people are under that incorrect assumption. Such is the power of marketing! Most content on streaming services is still HD SDR. A 4K HDR TV can't magically make HD SDR content look like 4K HDR.

Nah, there's plenty of 4K HDR content.

Here's Netflix's list:
 
Then why not support it? Whether or not you do not like it is irrelevant but I want my equipment to support every standard it can.
This is probably the reason why HDR10+ is probably being added to this year's major OS updates. However, the sooner HDR10+ dies, better it is for consumers.

There were almost always competing video standards: NTSC vs. RCA 441-lines, VHS vs. betamax, DVD vs. DiVX, Blu-Ray vs. HD-DVD, and so on.

When it comes to HDR, we have whopping 4 major standards: Dolby Vision, HDR10, HDR10+, and HLG (there are few more, but largely dead). One can make a case for HDR10 and HLG to co-exist, as they offer something others don't. But when it comes to Dolby Vision and HDR10+, there's really no reason for both to co-exist.
 
what is it and why do we need this? (and which devices would support it?)
There are multiple different standards for HDR (ie specifying larger dynamic range/contrast for video).
The highest quality one is probably Dolby Vision, the lowest quality one is probably HDR10, HDR10+ sits somewhere in the middle.
As usual, the highest quality option costs more (to create the content, or to put it on a TV), while the lowest quality option is the one that becomes most common.
As usual, Apple wants to support (if possible) only the highest quality option, and, as usual, people are complaining about that and wanting to get at least the partial benefit of the lower quality options. Apple obviously doesn't want to pay the license fee for HDR10+, but that's probably minor; a larger concern is just Apple's general irritation with people insisting on seven different ways of doing things instead of just going with the one, clearly best, way.

 
Hulu, Paramount+, Google Play, and Prime all support Dolby Vision. The only one on your list that doesn't support DV is YouTube, which also doesn't support 5.1 surround sound.
Incorrect: some of their content supports DV and some supports Dolby Vision.

It is a content-by-content decision. Streaming platforms can only offer streaming support; the content itself needs to be mastered to a specific HDR standard.
 
Samsung is more visible because Samsung created it after a spat with Dolby over a $3 per tv license. It is NOT an update to HDR10, which is created and maintained by the CTA. It’s name is like HD DVD - unrelated to what the name leads you to believe.

20th Century no longer uses it. And Dolby Vision also carries the base HDR10 data on its payload. Your comment reads like a copy/paste of a Wikipedia page that hasn’t been updated since 2017. It’s Samsung, Amazon and Paramount+. Warner on movies. And Hulu when it carries some Warner movies. Panasonic, Hisense and TCL have it, but they each also have DV.
Fair point on the 1st correction: I mistakenly did think it was a part of the CTA's standard.

I noted 20th Century helped found HDR10+ as a response that "it's just Samsung". 20th Century was likely motivated to migrate because they were acquired by Disney, a big DV proponent.

In the end, there will always be significant enough content that is HDR10+ only, e.g. YouTube will likely stick to HDR10+. Ignoring it has become a silly move.

Exclusively supporting only DV or only HDR10+ seems like needless consternation when many content players support both DV & HDR10+ without issues. Why should Apple, one of the most expensive streaming boxes, get a pass?

  1. All the latest-generation Roku players support HDR10+ and Dolby Vision
  2. All the 4K-capable Amazon Fire Sticks support HDR10+ and Dolby Vision
  3. The latest 4K Google Chromecast supports HDR10+ and Dolby Vision
Apple's recalcitrance and Samsung's recalcitrance look more and more like a useless nerd fight that has no benefit to most consumers. Just support both and we can end this pathetic limitation.

Again, the Apple TV 4K is often 2x the price of other streaming devices: we shouldn't have any compromises for HDR content.
 
Incorrect: some of their content supports DV and some supports Dolby Vision.

It is a content-by-content decision. Streaming platforms can only offer streaming support; the content itself needs to be mastered to a specific HDR standard.
Great point. More evidence that HDR10+ is fragmenting the industry and making it harder for services to deliver quality content.
 
Exclusively supporting only DV or only HDR10+ seems like needless consternation when many content players support both DV & HDR10+ without issues. Why should Apple, one of the most expensive streaming boxes, get a pass?
Because they are about integration, not universality. Apple has never been about supporting everything.
  1. All the latest-generation Roku players support HDR10+ and Dolby Vision
  2. All the 4K-capable Amazon Fire Sticks support HDR10+ and Dolby Vision
  3. The latest 4K Google Chromecast supports HDR10+ and Dolby Vision
None of these are premium streaming boxes, and the fire stick is questionably better than the built-in TV spyware.
Apple's recalcitrance and Samsung's recalcitrance look more and more like a useless nerd fight that has no benefit to most consumers. Just support both and we can end this pathetic limitation.
When Apple made the call not to support Flash people got upset, but anyone that took the time to notice that Flash was not a good standard for the future realized it was ok to not support it. There is no reason to support both HDR10+ and Dolby Vision, and when one considered that DV is vastly superior at only a fraction of a cost more, it makes sense for Apple to use their position to help the market consolidate.
Again, the Apple TV 4K is often 2x the price of other streaming devices: we shouldn't have any compromises for HDR content.
That's never been Apple's approach. Apple has always limited what they support, and in the case of the Apple TV box, that selectiveness has resulted in a noticeable lead against its competition. As soon as you start supporting two formats you are forced to support them going forward. Apple TV has more important issues to resolve, supporting a lower-quality standard most TVs don't support shouldn't be a priority.
 
What size tv ? I have a 55” LG OLED and see a significant difference when using my 4k ATV
 
The Apple TV+ app now plays in HDR10+ on my 2019 QLED TV. Just played Elvis and the TV switches to HDR10+ tried a few other HDR titles on Apple TV app and they all switch to HDR10+ so you don’t need a new Apple TV for HDR10+ if you have a Samsung TV
 
The Apple TV+ app now plays in HDR10+ on my 2019 QLED TV. Just played Elvis and the TV switches to HDR10+ tried a few other HDR titles on Apple TV app and they all switch to HDR10+ so you don’t need a new Apple TV for HDR10+ if you have a Samsung TV

Are you using the AppleTV or just the Apple+ app built into your Samsung? Could be a different result through an AppleTV.
 
Its just through the App on the TV the 2017 ATV 4K just plays HDR10 which I don’t use that much anymore.

It's possible they could push an update. My guess would be Apple+ shows will start to include DV and HDR10+ for new content. Not sure HDR10+ will survive, even with Samsung behind it. Amazon was the first to really support it, and now they are adding DV to most new content. There are a few 4K disc with HDR10+, but the vast majority are DV or just standard HDR10. Does Netflix have any HDR10+ content?
 
Because they are about integration, not universality. Apple has never been about supporting everything.

None of these are premium streaming boxes, and the fire stick is questionably better than the built-in TV spyware.

When Apple made the call not to support Flash people got upset, but anyone that took the time to notice that Flash was not a good standard for the future realized it was ok to not support it. There is no reason to support both HDR10+ and Dolby Vision, and when one considered that DV is vastly superior at only a fraction of a cost more, it makes sense for Apple to use their position to help the market consolidate.

That's never been Apple's approach. Apple has always limited what they support, and in the case of the Apple TV box, that selectiveness has resulted in a noticeable lead against its competition. As soon as you start supporting two formats you are forced to support them going forward. Apple TV has more important issues to resolve, supporting a lower-quality standard most TVs don't support shouldn't be a priority.

This reply is hilarious in context:

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I'd be glad if Apple brought HDR10+ to its older models; they did announce it, but then pulled it back, which makes me think the hardware was probably there all along.
 
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