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post #17071 of 25650 Old 08-01-2018, 06:01 PM
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Is going to pass atmos as far as I know, everything else is lossless pcm because it is decoded internally.
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post #17072 of 25650 Old 08-01-2018, 06:05 PM
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Originally Posted by azz7686 View Post
I just got the appltv 4k and for the last several evenings it doesnt matter what i play, netflix, plex, directv now, after about 2 hours the video on any of these apps or even in home screen gets slow and choppy. I have the harmony remote and have to use the reboot button. Then its fine again for another 2 hours.



Any suggestions? I would greatly appreciate it!!!


I don’t have the answer to your question but if you can’t figure it out, do a “reset and update” after you enable “one home screen”. It will reapply the tvOS and update (if necessary) and then reinstall all your apps in the same location. You will have to reenter passwords. Last resort but it’s fixed some of my issues over time.


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post #17073 of 25650 Old 08-01-2018, 07:35 PM
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Originally Posted by Musician View Post
NETFLIX - New Interface

Hey folks, you might have heard that Netflix is rolling out a new interface that now includes a sidebar. As you can see in the images below it now provides a collapsed (Thumbnail 1) and expended (Thumbnail 2) sidebar to find and navigate to your content quicker.

For example, when I go into the My List option (Thumbnail 3), instead of having to scroll left and right and remember where you started it now displays them in a grid 10 at a time that you can quickly scroll through using your up and down buttons.

For more info, please see Netflix’s July 18th announcement below...

See What’s Next...On TV

I was surprised to see it today on all my Samsung TV’s and my Samsung Ultra HD Blu-ray player as well as my Arris Set Top Boxes, but as of right now it still hasn’t reached my Apple TV 4K yet.

Note: in the case of the Samsung products and my Arris Set Top Boxes the Netflix upgrade did not require any firmware updates or changes to the Smart Hub apps
Thanks for the pictures. It seems like a nice UI update.
As for the update on TVs and Blu-ray players being rolled out before ATV, I guess it's due to Netflix app being HTML5 JavaScript-based (web) UI application on those devices. Hence, unless they update core engine components such as authentication, authorization, streaming engine, video pipeline and/or DRM, there's no need for client side update (eg. through firmware on TV and/or Blu-ray players).
Netflix app on ATV is a different story as it's native app coded with Objective-C. I guess this requires more lead time for updates to roll out.
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post #17074 of 25650 Old 08-01-2018, 08:05 PM
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Originally Posted by rsonnens View Post
I get your point. But without an analysis of your personal setting differences it’s hard to tell what the ATV conversation is doing verses what your TV is doing between the to modes when given two signal from a device where the output is converted to DV 100% faithfully.

I’m not saying that the ATV is faithful (or not.) I just have not seen an appropriate analysis (or statement from Apple) on what actually happens in the conversation of SDR to HDR on the ATV.


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Flatpanels did some testing early on. Apple “solved” the issue by creating Match Dynamic Range, rather than by improving the mapping issues outlined here. You can verify this yourself if you like.

https://www.flatpanelshd.com/review....&id=1507035457
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post #17075 of 25650 Old 08-01-2018, 10:15 PM
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They’re marketed to do so. They are not certified nor tested by an ACA to do so and there is no content and there are no devices that will be “48 gbs” for a couple years.


I know the isn’t co tent for it. Im saying the extra bandwidth fixed the issues I had with four other “certified” sets of hdmi cables. The certified cables didn’t work but the non certified cable with much higher bandwidth does work. Read around the internet about PS4 Pro running 4K RGB and 4K 4.2.2 not 4.2.0. You’ll see the issues MANY people are having. If no certified cable works when the certified ones don’t, why use a certified cable?



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post #17076 of 25650 Old 08-01-2018, 11:13 PM
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Apple TV owners' thread.

Quote:
Originally Posted by nathan_h View Post
Flatpanels did some testing early on. Apple “solved” the issue by creating Match Dynamic Range, rather than by improving the mapping issues outlined here. You can verify this yourself if you like.



https://www.flatpanelshd.com/review....&id=1507035457


I remember that article.

But there have been updates to Dolby Vision software on both the ATV and on the TVs themselves since that update. While the updates are mainly for other issues we have no idea all the changes they contain.

However regardless of that, unless you first test with a known 100% known perfect mapping of sdr->hdr and play that hdr and then compare it with the atv’s sdr->hdr mapping on the same tv using exactly the same setting then their are too many variables that could account for the differences.

Again, I’m not saying the ATV is doing a good or bad job all I’m saying is that the testing to date is not satisfactory to draw a conclusion from.

Last edited by rsonnens; 08-01-2018 at 11:32 PM.
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post #17077 of 25650 Old 08-01-2018, 11:29 PM
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Originally Posted by rsonnens View Post
I remember that article.

But there have been updates to Dolby Vision software on both the ATV and on the TVs themselves since that update. While the updates are mainly for other issues we have no idea all the changes they contain.

However regardless of that, unless you first test with a known 100% known perfect mapping and of sdr->hdr and play that hdr and then compare it with the atv’s sdr->hdr mapping on the same tv using exactly the same setting then their are too many variables that could account for the differences.

Again, I’m not saying the ATV is doing a good or bad job all I’m saying is that the testing to date is not satisfactory to draw a conclusion from.


Contact the author of that article and ask for a retest. Or better yet, Vincent Teoh. He likes testing AppleTV/HDR/TV stuff. It wouldn’t be scientific but it’d be entertaining.
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post #17078 of 25650 Old 08-02-2018, 03:01 AM
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I am based in the UK so should I set the Apple TV to 4K 50 or 4K 60

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post #17079 of 25650 Old 08-02-2018, 03:42 AM
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Originally Posted by JohnWB56 View Post
I am based in the UK so should I set the Apple TV to 4K 50 or 4K 60

It actually depends on what content you watch, which now can be any framerate, 24p, 25p, 30p, 50p or 60p.


I'd say put it on 4K 60 and make sure Match Frame Rate is turned on, then it will output the correct framerate which matches the program source when it plays.
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post #17080 of 25650 Old 08-02-2018, 04:06 AM
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Originally Posted by gadgtfreek View Post
The Apple TV outputs pcm. Is what it is.


Now that I’ve been schooled, I’m wondering, does the ATV4K decoded hi Rez audio and send it fully to pcm or does it downgrade it?


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post #17081 of 25650 Old 08-02-2018, 04:35 AM
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The 15’ cable is probably too long

15' is not too long for the MP Premium Certified cables.
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post #17082 of 25650 Old 08-02-2018, 04:40 AM
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Originally Posted by Stevetd View Post
Now that I’ve been schooled, I’m wondering, does the ATV4K decoded hi Rez audio and send it fully to pcm or does it downgrade it?


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I use Infuse for MKV's with lossless, and they say Infuse decodes it internally and the ATV is able to do 48khz 7.1 LPCM, so it is lossless.

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post #17083 of 25650 Old 08-02-2018, 04:43 AM
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2.5 years later and people still get the HDMI cables wrong.

Just buy this or BJC in the certified length:

https://www.monoprice.com/product?p_id=24187

Or something else with this label:


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post #17084 of 25650 Old 08-02-2018, 07:16 AM
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Originally Posted by GI Be View Post
Hello. I have recently purchased a 4K Apple TV and I have to connect it to a VPR that supports HDR but not Dolby Vision along with a Blu ray UHD player. I'm looking for an HDMI switch (only 2 inputs are enough) with audio extraction (Toslink or Coax SPDIF is the same). The audio output must be connected to an old A / V Receiver (Onkyo TX 818). I've seen a lot of them on sale on the net, but I'd like to be sure that the HDMI output signal does not get worse. I would like to be sure I can get up to 2160p 60Hz HDR 12bit 4: 4: 4 BT2020. Now, by connecting the two devices to the VPR individually I get these values. Has any of you been able to test any particular model? I would like suggestions. Thank you very much .
An HDfury Vertex has two HDMI inputs and two outputs.

You can run the bottom HDMI output at full 4K60 BT.2020 with HDR10/HLG/DV.

You can have the top HDMI output downscale to 1080p to the AVR. I have tested this with a Denon AVR that does not support Dolby Vision. Down scaling to 1080p 4:4:4 8-bit allows the Denon to process the audio portion of the signal. Your older AVR probably does not support Atmos or DTS:X but both are passed through to the AVR.

Do note that 2160p 60Hz HDR 12bit 4: 4: 4 BT2020 is not a valid HDMI 2.0 format. It would exceed the 600MHz / 18Gbps limit. 4K60 is only valid at 4:2:2 12-bit or 4:2:0 10/12-bit.
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post #17085 of 25650 Old 08-02-2018, 08:05 AM
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Originally Posted by nathan_h View Post
Flatpanels did some testing early on. Apple “solved” the issue by creating Match Dynamic Range, rather than by improving the mapping issues outlined here.
I'm more concerned with the quality of Apple's conversion of native Dolby Vision content to HDR10 than I am SDR to fake HDR. Something I saw awhile back (can't remember the source ATM) indicated that the ATV4K was not typically creating a very wide dynamic range in the "synthetic" HDR10 signals it creates from native DV, resulting in content that doesn't look as good as if it were originally created in HDR10. Hopefully Apple either improves that or changes tvOS so that it requests and plays back native HDR10 versions (rather than DV versions that must be converted) from apps such as Netflix, if HDR10 is available.
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post #17086 of 25650 Old 08-02-2018, 08:48 AM
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Since the DV profile Apple uses for their encodes allows the data and meta data to be separate, they should be able to map 100% accurately.

But you can do an informal test yourself, if you like. Visually, if you force HDR10 output from DV content, and then let it play as DV content, it all looks the same except for tone mapping of extreme highlights on a TV that can't do more than 1000nits. That, of course, is not an error in the mapping, but rather the difference between how DV and HDR10 are handled by display devices.

Yes, measurement would be better than visual comparison. But since the visual comparison is consistent with how native HDR10 content shows up, that's what counts to my eyes. Ymmv.

(Note, I assume that one has calibrated DV and HDR10 on one's display to spec, otherwise there will almost certainly be a big difference in how the two look.)
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post #17087 of 25650 Old 08-02-2018, 08:54 AM
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Originally Posted by rsonnens View Post
I remember that article.

But there have been updates to Dolby Vision software on both the ATV and on the TVs themselves since that update. While the updates are mainly for other issues we have no idea all the changes they contain.

However regardless of that, unless you first test with a known 100% known perfect mapping of sdr->hdr and play that hdr and then compare it with the atv’s sdr->hdr mapping on the same tv using exactly the same setting then their are too many variables that could account for the differences.

Again, I’m not saying the ATV is doing a good or bad job all I’m saying is that the testing to date is not satisfactory to draw a conclusion from.
Fair enough. I guess we can agree to disagree.

The methods of that test were very sound. Take a known good SDR test pattern and calibrated monitor and measuring device. Play the SDR test pattern with Apple's conversion to "HDR" (really, SDR within an HDR container). Measure to see if it is as accurate as playing back the SDR test pattern in SDR. Result? It is not. Conclusion: The ATV mapping was not perfect.

Has that changed? Would it be nice to test again? Sure. But since the only known published test with proper controls demonstrated that Apple got it wrong, I'll assume it is still that way unless someone has test results that indicate otherwise.

And as noted in the article, Apple (and everyone else) thinks they "fixed" this by offering the workaround of "match dynamic range" -- which I am satisfied with, as well. Their mapping can still be imperfect but we don't have to suffer through it any longer.
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post #17088 of 25650 Old 08-02-2018, 08:56 AM
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Originally Posted by GI Be View Post
Hello. I have recently purchased a 4K Apple TV and I have to connect it to a VPR that supports HDR but not Dolby Vision along with a Blu ray UHD player. I'm looking for an HDMI switch (only 2 inputs are enough) with audio extraction (Toslink or Coax SPDIF is the same). The audio output must be connected to an old A / V Receiver (Onkyo TX 818). I've seen a lot of them on sale on the net, but I'd like to be sure that the HDMI output signal does not get worse. I would like to be sure I can get up to 2160p 60Hz HDR 12bit 4: 4: 4 BT2020. Now, by connecting the two devices to the VPR individually I get these values. Has any of you been able to test any particular model? I would like suggestions. Thank you very much .
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Below is what I use. It's the real deal. I call it the "AVR Savior" because I didn't have to replace my otherwise awesome Pioneer Elite that could pass HDR and does Atmos, but it could not handle DV or HLG. I have a DirecTV 4K box, a Samsung K8500 UHD Blu-ray and an ATV 4K.

PM me with any questions. . .

https://www.avproedge.com/ac-mx42-au...to-matrix.html
Quote:
Originally Posted by claw View Post
...Do note that 2160p 60Hz HDR 12bit 4: 4: 4 BT2020 is not a valid HDMI 2.0 format. It would exceed the 600MHz / 18Gbps limit. 4K60 is only valid at 4:2:2 12-bit or 4:2:0 10/12-bit.
Or, if you force 4K/60Hz at 4:4:4, you'll then be maxing color bitrate to only 8-bit.

Quote:
Originally Posted by NashGuy View Post
I'm more concerned with the quality of Apple's conversion of native Dolby Vision content to HDR10 than I am SDR to fake HDR. Something I saw awhile back (can't remember the source ATM) indicated that the ATV4K was not typically creating a very wide dynamic range in the "synthetic" HDR10 signals it creates from native DV, resulting in content that doesn't look as good as if it were originally created in HDR10. Hopefully Apple either improves that or changes tvOS so that it requests and plays back native HDR10 versions (rather than DV versions that must be converted) from apps such as Netflix, if HDR10 is available.
Same here (it was this video):
Code:
https://youtu.be/ipo05SYfqXw
since my display isn't DV capable, I'm forced to watch Netflix from another device in order to be certain that I'm getting native HDR10.

@nathan_h , " they should be able to map 100% accurately," but I'll wait for Vincent to confirm if/when they actually do
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post #17089 of 25650 Old 08-02-2018, 08:57 AM
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Originally Posted by captainbrent View Post
15' is not too long for the MP Premium Certified cables.
15' is within spec and I have one and it works for 4k60 4:4:4.

But some bad cables do reach end users. And a marginal cable is more likely to be an issue with a 15' cable than a 6' cable. I assume the OP is referencing that.
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post #17090 of 25650 Old 08-02-2018, 09:03 AM
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Originally Posted by galonzo View Post

Same here (it was this video):
Code:
https://youtu.be/ipo05SYfqXw
since my display isn't DV capable, I'm forced to watch Netflix from another device in order to be certain that I'm getting native HDR10.

@nathan_h , " they should be able to map 100% accurately," but I'll wait for Vincent to confirm if/when they actually do
The good news is that Apple corrected that meta data fiasco months ago. Now, their HDR10 output no longer injects generic (typically inaccurate) meta data about mastering monitor, peak nits, etc. but appears to generate real numbers (based on what I see on my Vertex).

(The other differences he notes, the highlight details, underscore the differences between HDR10 and DV -- but that is normal and should be present whether the ATV content originated as a DV stream, and was converted to HDR10, or originated as an HDR10 stream.)

Are you saying you see something different when watching HDR10 (converted from DV) output from the ATV (on, say, Netflix DV content) versus HDR10 output of the same content from Netflix on a playback device that only supports HDR10? That's not what I'm seeing. But since HDR10 is the wild west in terms of how display's handle it, it could be that my display is different from yours.

I would be great for Vincent to revisit this, now that Apple has fixed the meta data injection.


UPDATE: Sorry, I misread your post. Your display in HDR10 only. That's fine. One of mine is and it is 100% awesome. But you can still do the visual test. Play back some DV netflix content from the ATV. It will show up as HDR10 content on the TV. Then, using the same TV input/settings, play back that netflix content from a player that only plays HDR10 (so you are getting the native HDR10 stream from netflix). I'll guess that they look the same. It would be super interesting to hear if they are not.
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Last edited by nathan_h; 08-02-2018 at 09:11 AM.
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post #17091 of 25650 Old 08-02-2018, 09:11 AM
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Originally Posted by nathan_h View Post
Fair enough. I guess we can agree to disagree.



The methods of that test were very sound. Take a known good SDR test pattern and calibrated monitor and measuring device. Play the SDR test pattern with Apple's conversion to "HDR" (really, SDR within an HDR container). Measure to see if it is as accurate as playing back the SDR test pattern in SDR. Result? It is not. Conclusion: The ATV mapping was not perfect.



...


Actually this is not an accurate test.


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post #17092 of 25650 Old 08-02-2018, 09:41 AM
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Quote:
Originally Posted by nathan_h View Post
The good news is that Apple corrected that meta data fiasco months ago. Now, their HDR10 output no longer injects generic (typically inaccurate) meta data about mastering monitor, peak nits, etc. but appears to generate real numbers (based on what I see on my Vertex).

(The other differences he notes, the highlight details, underscore the differences between HDR10 and DV -- but that is normal and should be present whether the ATV content originated as a DV stream, and was converted to HDR10, or originated as an HDR10 stream.)

Are you saying you see something different when watching HDR10 (converted from DV) output from the ATV (on, say, Netflix DV content) versus HDR10 output of the same content from Netflix on a playback device that only supports HDR10? That's not what I'm seeing. But since HDR10 is the wild west in terms of how display's handle it, it could be that my display is different from yours.

I would be great for Vincent to revisit this, now that Apple has fixed the meta data injection.


UPDATE: Sorry, I misread your post. Your display in HDR10 only. That's fine. One of mine is and it is 100% awesome. But you can still do the visual test. Play back some DV netflix content from the ATV. It will show up as HDR10 content on the TV. Then, using the same TV input/settings, play back that netflix content from a player that only plays HDR10 (so you are getting the native HDR10 stream from netflix). I'll guess that they look the same. It would be super interesting to hear if they are not.
I don't have a vertex, but when I play an HDR show from Netflix from the ATV on my 1000nit display (JS9500), highlights are noticeably blown out when compared to the same content from my Roku, which is presumably outputting the native HDR10 version of the show (as there aren't any Roku's that can do DV, other than the DV Roku TVs); for completeness, the HDMI input that the ATV is going into is calibrated for HDR-10, then the settings are duplicated to the HDMI input the Roku is connected to (even so, I swapped devices and inputs, and get the same results). I'm still on TVOS 11.4.1, so hopefully this will be fixed in the next firmware.
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post #17093 of 25650 Old 08-02-2018, 10:22 AM
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That's a good test. Unless Netflix is doing something funky, the only conclusion is that Apple's mapping (probably still meta data issues since blown highlights indicate poor tone mapping and most displays honor meta data as part of tone mapping -- unless one overrides it with something like dynamic HDR on the LG OLEDs) is problematic.

It would be interesting to insert a Vertex and compare the meta data between the two sources. For my HDR10 only display, I actually strip out the meta data (because in general I don't trust that it is useful/accurate/consistent, even on UHD disks) and use a single tone map that is the best compromise for most content I watch.

I don't frequent the ATV developer or beta forums, but this doesn't appear to be something I can see anyone working on / discussing / logging bugs on, via a quick search.
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post #17094 of 25650 Old 08-02-2018, 10:46 AM
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15' is within spec and I have one and it works for 4k60 4:4:4.

Your preaching to the choir Nathan, I have two of them in use...and I'm sure there are thousands of others too.


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But some bad cables do reach end users. And a marginal cable is more likely to be an issue with a 15' cable than a 6' cable. I assume the OP is referencing that.

Maybe so but I'm wondering if he was actually using the Premium Certified cables or if they were the Certified High Speed ones, which almost universally, did not work. But, he seems to want to push the so called HDMI 2.1 cable.
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post #17095 of 25650 Old 08-02-2018, 01:32 PM
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I'm more concerned with the quality of Apple's conversion of native Dolby Vision content to HDR10 than I am SDR to fake HDR. Something I saw awhile back (can't remember the source ATM) indicated that the ATV4K was not typically creating a very wide dynamic range in the "synthetic" HDR10 signals it creates from native DV, resulting in content that doesn't look as good as if it were originally created in HDR10. Hopefully Apple either improves that or changes tvOS so that it requests and plays back native HDR10 versions (rather than DV versions that must be converted) from apps such as Netflix, if HDR10 is available.

Me too. I don't have a DV television, so I'm working with just HDR10. I did some reviews of ATV HDR10 vs Roku Stick+ vs. my Sony tv internal app. In my opinion, the ATV HDR10 content from Netflix or Amazon looks noticeably less robust than on my Roku or TV (which looked very similar).



Now, I'm hesitant to say "worse", because I don't know if it's technically more or less proper. I'm not a torch mode viewer in general, and I always reset my setting down to proper videophile-advised dark room settings, and I watch in dark rooms, but when I watch HDR content I want to see the highlights shine. I don't have a particularly bright TV, but I like to see things like flashlights, car headlights and light coming into a dark room through a window, etc really pop. And of course I like the colors to shine. If someone wants to tell me that this extra contrast isn't really the best HDR, and Apple's is some kind of higher fidelity even if it's less dramatic, I'm not going to fight about it. But to me, that's HDR, bright highlights against dark blacks. And the Apple TV doesn't do it that as well as my other devices.


On the contrary, I actually really like what the ATV does with it's "fake HDR" on SDR content. I definitely don't see it as darker (at least to my taste), and I think it definitely brings it much closer to HDR content. I can't think of anything where I've felt it was distorted. For my money, it does a great job. I watched Future Man on Hulu and it did wonders, it was "more HDR" than some of Netflix's lesser HDR efforts like Death Note and The OA. Still not up to the better implementations of HDR for sure, and some SDR content seems to "convert" more dramatically, but a marked improvement over straight SDR to me.


So I'm in a situation where I watch the ATV for almost everything, EXCEPT HDR programming, which I switch to the Roku or internal TV app. ATV's HDR isn't terrible or anything, but I would love to see them equal what I'm seeing on those apps, especially since Atmos is coming along and it's almost a single-box solution for me otherwise.
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post #17096 of 25650 Old 08-02-2018, 01:35 PM
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Sorry to bring this back up, but I've been scanning through google images trying to find something that best represents what "flashes" on my screen. This is pretty close:






Audio doesn't drop when this happens, and it lasts less than a second. Any thoughts on what's happening? Happens on any app on ATV, and not on any other device going through my receiver, nor on the TV's internal app.


I won't keep bringing it up, but thought someone might recognize what I'm seeing with a picture.


Thanks.

I hope I'm not speaking too soon, as I haven't put a ton of straight viewing hours on it yet, but from what I can tell, this seems to have been fixed in the latest beta. Knock on wood.
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post #17097 of 25650 Old 08-02-2018, 02:31 PM
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I hope I'm not speaking too soon, as I haven't put a ton of straight viewing hours on it yet, but from what I can tell, this seems to have been fixed in the latest beta. Knock on wood.


I mentioned that in the beta thread on Monday.


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post #17098 of 25650 Old 08-02-2018, 03:37 PM
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On the contrary, I actually really like what the ATV does with it's "fake HDR" on SDR content. I definitely don't see it as darker (at least to my taste), and I think it definitely brings it much closer to HDR content. I can't think of anything where I've felt it was distorted. For my money, it does a great job. I watched Future Man on Hulu and it did wonders, it was "more HDR" than some of Netflix's lesser HDR efforts like Death Note and The OA. Still not up to the better implementations of HDR for sure, and some SDR content seems to "convert" more dramatically, but a marked improvement over straight SDR to me.


So I'm in a situation where I watch the ATV for almost everything, EXCEPT HDR programming, which I switch to the Roku or internal TV app.
Fair point. We are all looking for something different.

For me, I hate the way Apple's fake HDR looks. I want my SDR to be accurate to the source and displayed in SDR, with SDR gamma and REC709 color space and color temp at D65/6500K. I'm just glad Apple enabled that kind of accuracy.

And I'm fine if other folks like to use other settings. I'm glad you found something that you like.

---

I guess we should note that the OP was worried about HDR10 having blown out highlights, when the source was a DV stream, which is something else, again, probably related to meta data and how particular TV's tone map (sometimes blindly using the metadata, sometimes ignoring it and mapping based measuring the content, sometimes ignoring both the metadata and the content and using a generic curve for everything, etc).
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post #17099 of 25650 Old 08-02-2018, 09:12 PM - Thread Starter
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Is there any article and/or whitepaper on QDH1 codec Apple uses for 4K streaming ?
I would like to read about it and learn how it's different from HEVC. Google search doesn't help. Perhaps, only customized extension over HEVC. But I'm impressed how it handles picture quality at only 1/3 to 1/2 of bitrate compared to HEVC on disc.
Don't confuse labels with codecs. I.e. Apple calls SDR+AVC hvc1, HDR10+HEVC qhvc and DV+HEVC qdh1. They also have Apple specific labels for audio codecs e.g. E-AC-3 is called qec3 and AC-3 is called qac3. Apple supported codecs for the ATV4k can be found on the [specs] page. By the way a UHD-BD can produce quite a bit more than three times the bandwidth of a 25Mb iTunes HDR stream.

I might type 2K for 1080p.
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post #17100 of 25650 Old 08-02-2018, 09:20 PM - Thread Starter
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Actually this is not an accurate test.
Perhaps you're trying too hard. Apple may simply add static meta-data to the output stream. All the differences would then be in the display's tone-map which you can typically neither change or defeat.

I might type 2K for 1080p.
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