Does it airplay at 4K 60 finally? Does it allow you to select it on the phone while air playing?
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I don't think the YouTube app supports HDR at all on even the latest ATV 4k.
- Thread starter richard371
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So basically Youtube is not supporting range matching. There are 3 scenarios:
1. If you have your Apple TV set to SDR and load a HDR video in Youtube it will stay in SDR mode.
2. If you have your Apple TV set to HDR and load a HDR video in Youtube it will stay in HDR mode.
3. If you have your Apple TV set to Dolby Vision and load a HDR video in Youtube it will stay in Dolby Vision mode.
So the question is if you manually select HDR mode as in Scenario 2 is Youtube actually outputting real HDR from the video? (Good luck trying to explain this to Apple or Youtube)
1. If you have your Apple TV set to SDR and load a HDR video in Youtube it will stay in SDR mode.
2. If you have your Apple TV set to HDR and load a HDR video in Youtube it will stay in HDR mode.
3. If you have your Apple TV set to Dolby Vision and load a HDR video in Youtube it will stay in Dolby Vision mode.
So the question is if you manually select HDR mode as in Scenario 2 is Youtube actually outputting real HDR from the video? (Good luck trying to explain this to Apple or Youtube)
No but "SMPTE 2084 PQ" does.
Correct
That's not a reliable indication. The Youtube app on my TV 100% supports HDR but it doesn't say HDR in the quality settings either.
What we need is for someone to do some real measurements and analysis to see if the HDR is real or fake.
Who knows. I tried the famous HDR videos on both SDR and HDR settings for the ATV and both look great. id probably need a direct AB comparison to see a difference. I prefer to keep my tv in SDR as I dont like the fake HDR and I already ruined one panel by leaving it in HDR all the time. I mainly watch non HDR content such as Sling. I hope YouTube updates their app too. They did for the 4k60 stuff.
Yeah it seems it’s only videos that are 4K HDR @60hz that the ATV4K 2017 has an issue with so drops down to 2560x1440@60.
If it’s 4K HDR @24hz then it plays back at 3840x2160@24 and just drops the HDR.
Not that the frame rate makes much difference anyway as currently the YouTube app doesn’t support frame rate matching so even though stats for nerds says it @24 the TV just displays it at whatever you have the ATV4K set to which will usually be wither @50hz or @60hz.
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People, please start thinking a bit critically and do testing to verify your "ideas".
Here is a photo with the YT app and tvOS 14.6 on an ATV 4K 2021. The GUI is set to 4K SDR with full-range RGB output.
Dynamic range matching is enabled but since the YT app doesn't support it it doesn't matter - note your "SMPTE 2084 PQ evidence". Just because a video file is proper HDR doesn't mean the player software (YT app) is decoding and sending it out properly. The only "HDR" you are currently seeing with the YT app is fake HDR applied after the fact by the ATV GUI software that has nothing to do with the original HDR content!
Attachments
It shows and proves the exact opposite.
- Some people seem to think that just because the YouTube app lists "SMPTE 2084 PQ" in its details that they are getting real HDR;
- The RGB in the FreeSync details proves that the ATV itself is only outputting an SDR signal since currently it cannot output HDR with RGB, even then the YT app is showing its little SMPTE 2084 PQ note;
- The ATV GUI is sitting on top of everything and applys its "HDR" (cranking up colors and brightness "by chance") to anything if its HDMI output is set to 4K HDR;
I only asked because I don't think I have seen my AppleTV show RGB under freesync on my CX it has always show YCbCr.
That is strange:
If I set the output format to "4K SDR", I can choose between "YCbCr", "RGB High" and "RGB Low" in the HDMI Output options below the "Format" menu.
If set to "4K HDR" this is no longer possible and YCbCr 4:2:2 is the "best" there is since Apple understandably doesn't have the software engineering resources to implement the HDMI 2.1 standard properly for an "innovative" new product at launch.
@richard371
?
(I only use HDMI cables that can handle 48 Gbit/s, the bestest standard there currently is for HDMI 2.1)
But even worse cables shouldn't do much to the ATV 4K 2021 with its current firmware since it is not actually using HDMI 2.1 video output.
?
(I only use HDMI cables that can handle 48 Gbit/s, the bestest standard there currently is for HDMI 2.1)
But even worse cables shouldn't do much to the ATV 4K 2021 with its current firmware since it is not actually using HDMI 2.1 video output.
If you actually read my entire post you'll know that's exactly what I did.
Please let us know what Tests you've conducted to verify your conclusions.
HINT: Reading info screens is not a Test.
I am unable to follow your logic.
You at first interjected that my statement regarding "SMPTE 2084 PQ" NOT automatically meaning HDR playback was incorrect.
This comes after multiple users including me were able to determine with their eyeballs that the tvOS YT app is not showing real HDR but it is only using the fake HDR applied over everything by the ATV GUI.
I then supported this subjective opinion with objective evidence showing HDMI link status details where even if the TV is guaranteed to not get an HDR HDMI signal due to the ATV's current firmware limitations when using the RGB color space, the tvOS YT app is still showing "SMPTE 2084 PQ".
If you disagree with this point of view then you should form a coherent argument outlining what's wrong with the one I presented instead of pumping out vague one-liners. Then I would constructively engage further.
But at this point in time I personally think that people that state that HDR is actually working correctly with the current tvOS YT app have the burden of proof.
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That is not at all what you said. This is what you said: "BT.2020 does not automatically mean HDR playback:"
"SMPTE 2084 PQ" does indeed mean that Youtube is playing an HDR source video.
Eyeballs are not a scientific measurement.
Completely irrelevant. When the AppleTV is in HDR mode the Youtube app also says SMPTE 2084 PQ. So does that mean we've just proven it plays HDR?
There is no need to form "arguments". Again what we need is someone to use measuring tools to do a scientific comparison.
Until then all your arguments and proclamations are meaningless.
No.
You - again - showed that Google is sending a video file with HDR properties from its servers to the tvOS YT app. It says nothing about the tvOS YT app actually decoding this file properly and generating a video signal that also includes the HDR information from the original video file for the ATV to output via HDMI.
Now we're back to posting #13:
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Correct.
This is nothing but an assumption on your part. Once again without measurements there is no way to prove whether the AppleTV is applying "fake" HDR on top of a SDR video from youtube, or whether it is passing the HDR video thru.
And I don't want to add to the assumptions but it would seem silly to have a HDR file be stripped of HDR and then add fake HDR on top of it. It would be much easier to just play the original HDR file as is. But we've seen lots of silly things from AppleTV so again I don't want to make assumptions. I'll wait until someone has definitive proof.
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If you cannot accept an LG status display showing an HDMI input signal not being HDR since the ATV cannot even output an RGB HDR signal at all (!) then I honestly think that you are just trolling and I fell for it.
Why are you outputting SDR? Are you aware that you need to set your AppleTV to HDR for this conversation to even make any sense?
Are you aware that your LG shows a popup anytime it detects HDR? Why are you even looking at a secret menu?
One thing we know for sure is that Youtube does not support format matching.
Seems like I'm the one being trolled.
Has anyone used streaming stats in developer settings to see if what dynamic range is being decoded internally for youtube hdr vids?
Someone on reddit was able to use this to determine 4K titles on HBO Max have been downscaled to 2K SDR on the latest update.
www.howtogeek.com
Someone on reddit was able to use this to determine 4K titles on HBO Max have been downscaled to 2K SDR on the latest update.
How to Unlock Detailed Streaming Statistics on the Apple TV
The Apple TV is great way to get content onto a television, but have you ever wondered whether it's working to its full potential? Here's how to see all the streaming stats you could ever need.
www.howtogeek.com