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Apple tv 4k second gen not hdmi 2.1

Why is apple advertising this device as hdmi 2.1 when it is not using the 2.1 protocol and stuck on 2.0 video limitations?

Apple TV 4K, tvOS 15

Posted on Aug 31, 2022 8:46 AM

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Aug 31, 2022 1:39 PM in response to Skratch77

So I switched back to my Xbox and getting true rgb 10 bit with 120fps and also noticed the sound is alot better using the Xbox in my home theater setup. From what I have read it's sampling it at 16bit and 48k and is very noticeable between the Xbox that can pass the sound directly to my preamp dac etc. This is a huge let down for me because I love the apple tv interface but the picture and sound quality is alot better using the Xbox.


Here is a pic of the Xbox playing 12k video on YouTube and its night and day more popping on the Xbox.

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Aug 31, 2022 9:52 AM in response to Skratch77

  1. RGB is always 4:4:4. The other option, YCbCr, in this context can be 4:2:0 or 4:2:2 or 4:4:4. Which chroma setting you choose doesn’t matter all that much, as all streaming video is 4:2:0 in the source.
  2. Do use “Ultra High Speed” HDMI cables rated 48 Gbps to enable all HDMI 2.1 features. Else the bandwidth (and features) will be throttled back to the specification of the lesser cable (5/10/18 Gbps).
  3. Do verify the video settings on Apple TV, to see that the output format is as intended.
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Aug 31, 2022 10:14 AM in response to Urquhart1244

That is my point this device will not go higher than the 18gb tdms standard. It definitely is not using the 48gb fps 2.1 standard.


I can get 4k sdr 4:4:4 that falls right under the 18gb bandwidth but when switching to hrd it drops to 4:2:0 etc


I found a video on YouTube explaining my issue.


https://m.youtube.com/watch?v=R3fH-v9NwKQ

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Aug 31, 2022 3:29 PM in response to Urquhart1244

Yes sorry was trying to get posted with the video settings and over looked what I posted about the audio. Apple tv 4k is limited to 48khz sample rate while the Xbox will do 96khz. I found this on apples support page saying it does not support hi res audio and will post a picture.


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Aug 31, 2022 2:00 PM in response to Skratch77

Verify that the LG settings on the HDMI port to which the Apple TV is connected, has “Deep Color” set to “4K”. Both are somewhat inaccurate terms, but that is how LG does it. (“Deep Color” set bandwidth limits, not color depth per se.) (“4K” is the ‘high’ setting for that, but Off also allows for 4K albeit 4K SDR@60Hz 4:2:0.) Connected (gaming) devices capable of up to 120Hz or VRR would assume high setting automatically, but Apple TV outputs a lower 60Hz at this time. On the TV, you can only change the settings of the HDMI-IN you are watching at the time. You can specify a different setting for each HDMI port.

⚙﹥(⋮)﹥General﹥Devices﹥HDMI Settings﹥HDMI Deep Color﹥

See page 104–105 of the LG User Guide.

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Aug 31, 2022 2:09 PM in response to Skratch77

From what I have read it's sampling it at 16bit and 48k and is very noticeable between the Xbox that can pass the sound directly to my preamp dac etc.

The audio from the streaming video is also 16 bit and 48 kHz in the source, so that is no reason for a difference per device.

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Apple tv 4k second gen not hdmi 2.1

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