Apple today seeded the release candidate version of an upcoming tvOS 15.5 update to developers for testing purposes, with the software coming one week after the release of the fourth beta. Developers can download the new tvOS 15.5 update by downloading a profile onto the ‌Apple TV‌ using Xcode.

tvOS updates are typically minor in scale, focusing primarily on under-the-hood bug fixes and improvements rather than major outward-facing changes.

Though we don't often know what's new in tvOS during the beta testing process, we let MacRumors readers know when new updates are available so those who are developers can download it upon release.

As of now, we have not found new features in tvOS 15.5 and there's no word on what might be in the update beyond bug fixes and under-the-hood performance improvements.

Article Link: Apple Seeds tvOS 15.5 Release Candidate to Developers

tvOS 15.5 RC (19L570) available to PB testers also

YouTube HDR playback support please. Please. Please. If it's something Google needs to do, then do it. Please.
Support of reading metadata from Amazon for auto mode switch too. FILMMAKER MODE.

ThatGuyInLa said:

YouTube HDR playback support please. Please. Please. If it's something Google needs to do, then do it. Please.
Support of reading metadata from Amazon for auto mode switch too. FILMMAKER MODE.

Thats only on ATV4K 2nd gen. The ATV 4K 1st gen A10X Fusion SoC doesn't support hardware decoding of VP9 videos.

ThatGuyInLa said:

YouTube HDR playback support please. Please. Please. If it's something Google needs to do, then do it. Please.
Support of reading metadata from Amazon for auto mode switch too. FILMMAKER MODE.

2nd gen Apple TV 4K supports YouTube HDR, but with a caveat. YouTube doesn't support tvOS's Match Dynamic Range feature. So to watch, you need to change Apple TV's Video Format setting to HDR (HDR10), then flip it back to SDR when you want to watch non-HDR contents.

I've reported this bug to Google earlier, as I am sure others have, but it remains unfixed.

To be fair, some of Apple's own features and apps don't support Match Dynamic Range either -- Photos and screensavers.

nutmac said:

2nd gen Apple TV 4K supports YouTube HDR, but with a caveat. YouTube doesn't support tvOS's Match Dynamic Range feature. So to watch, you need to change Apple TV's Video Format setting to HDR (HDR10), then flip it back to SDR when you want to watch non-HDR contents.

I've reported this bug to Google earlier, as I am sure others have, but it remains unfixed.

To be fair, some of Apple's own features and apps don't support Match Dynamic Range either -- Photos and screensavers.

I have it connected to a LG OLED. If I set the 2nd gen 4K to its default 4K@60Hz HDR with last few betas. It correctly switches to Dolby Vision automatically and doesn't have any issues with YouTube working SDR to HDR10 automatically. Just don't set the ATV4K 2nd gen to have a GUI using 4K Dolby Vision at all. I have both match dynamic range and frame rate set to auto.

Realityck said:

I have it connected to a LG OLED. If I set the 2nd gen 4K to its default 4K@60Hz HDR with last few betas. It correctly switches to Dolby Vision automatically and doesn't have any issues with YouTube working SDR to HDR10 automatically. Just don't set the ATV4K 2nd gen to have a GUI using 4K Dolby Vision at all. I have both match dynamic range and frame rate set to auto.

Your reply and the other guys earlier have me running downstairs now! Thank you! (actually you are speaking of Beta which I don't run) So this probably won't work for current release?

nutmac said:

2nd gen Apple TV 4K supports YouTube HDR, but with a caveat. YouTube doesn't support tvOS's Match Dynamic Range feature. So to watch, you need to change Apple TV's Video Format setting to HDR (HDR10), then flip it back to SDR when you want to watch non-HDR contents.

I've reported this bug to Google earlier, as I am sure others have, but it remains unfixed.

To be fair, some of Apple's own features and apps don't support Match Dynamic Range either -- Photos and screensavers.

Photos and Screensavers still??? GRRrrrr.

ThatGuyInLa said:

Your reply and the other guys earlier have me running downstairs now! Thank you! (actually you are speaking of Beta which I don't run) So this probably won't work for current release?

Very likely, but RC is safe. I mentioned earlier in this post,

wonder if it will ever passthrough uncompressed Dolby Atmos.

Realityck said:

Thats only on ATV4K 2nd gen. The ATV 4K 1st gen A10X Fusion SoC doesn't support hardware decoding of VP9 videos.

Heart (Like) means thanks for not having me to have to type this

AL2TEACH said:

wonder if it will ever passthrough uncompressed Dolby Atmos.

No. The Apple TV do not support Dolby True HD with the additional Atmos metadata layer. (hardware wise, it does not have the decoder).

Hmm I’m noticing eARC issues that I didn’t have before. Audio crackling. Restart resolves it but bummer.

B/D said:

No. The Apple TV do not support Dolby True HD with the additional Atmos metadata layer. (hardware wise, it does not have the decoder).

Which is why Apple needs to add bitstream passthrough, so our soundbars & AVRs can decode the audio. Period.

InauguralHobbit said:

Which is why Apple needs to add bitstream passthrough, so our soundbars & AVRs can decode the audio. Period.

Normally you have the ATV4K HDMI going to AVR that decodes the audio utilized, then in turn outputs to the 4K TV assuming the AVR is 4K pass though capable. That way you don't need ARC/eARC unless your TV app need to be used instead by the AVR. You can even go that route with some more HDMI connected SoundBars.

Realityck said:

Normally you have the ATV4K going to AVR that decodes the audio utilized. That way you don't need ARC/eARC unless your TV app need to be used instead. You can even go that route with HDMI connected SoundBars.

Exactly my point. NO. That method is an archaic delivery schema for data. Leave "normally" in the past where it belongs.

We don't want to do that anymore a la HDMI 2.1 & its features: QMS, QFT, VRR via FRM (24.95Hz or 30/60Hz for YouTube), etc.

The way forward isn't the "normally" way.

Cease with the pre-HDMI 2.1 way of thinking, that's not the direction the industry is headed. Apple needs to catch up because it's clearly not pushing the envelope.

InauguralHobbit said:

Exactly my point. NO. That method is an archaic delivery schema for data. Leave "normally" in the past where it belongs.

We don't want to do that anymore a la HDMI 2.1 & its features: QMS, QFT, VRR via FRM (24.95Hz or 30/60Hz for YouTube), etc.

The way forward isn't the "normally" way.

Cease with the pre-HDMI 2.1 way of thinking, that's not the direction the industry is headed. Apple needs to catch up because it's clearly not pushing the envelope.

Click to expand...

Why is it a archaic delivery schema for the bitstream? The AVR is nothing more the a HDMI repeater, it does nothing to the video data, and is a far superior decoder for the audio going to amp driving your speakers. They have AVRs that are now 8K capable pass through. You trust the audio quality more from the source to TV and back to AVR?

Is this coming from the gaming perspective because you mentioned QFT? Lets also remember Apple is notorious slow on supporting HDMI standards, so everyone talks about HDMI 2.1 on a ATV 4K so we need to wait for the next ATV4K to see if its added.