Strobe effect with HDR on Apple TV

Since the update to tvOS 12.3, I’ve seen a consistent “strobe” effect when watching HDR content on my Apple TV 4K. I’ve seen a few older posts describing this, but there didn’t seem to be a solution, so I’m posting a new question. It’s a sometimes subtle, sometimes not so subtle flickering of the darkest parts of the image, and I’ve tried everything I can do to fix it: I set the ATV to different frame rates, toggled match content settings, set chroma to 4:2:0, used different HDMI cables (including a new one purchased today), nothing makes a difference. I thought I would try downgrading the software to 12.2 but apparently that’s not an option on the 4K...


I’m using a TCL Roku TV and I’ve tried the same content directly through the apps on the TV, and everything looks fine. The only thing I can assume at this point is that it could be a hardware issue with the ATV, but the problem only started with the 12.3 update for me. I would just bypass the ATV, but some of my HDR movies (in this case, Harry Potter) are only in HDR on the Apple TV and not anywhere else (Vudu, Movies Anywhere, etc). Does anyone have any thoughts or suggestions?



Apple TV 4K, tvOS 12

Posted on May 25, 2019 8:04 PM

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40 replies

May 26, 2019 8:03 PM in response to Crh19

I am having the exact same problem, it affects HDR10 content mostly, occasionally a Dolby Vision will bug out. The movies specifically played within the AppleTV app, you know movies played from iTunes purchases are affected. This issue began with TvOs12.3. I thought it was the new tv I purchased, but I can play movies from other sources without any issue. It does not affect VUDU, Movies Anywhere, or any other app on the Apple TV 4K for me. I too have fiddled with the settings. If you reset the Apple TV within the settings menu it goes away when you first play the movie, then it comes back is you try to play it a second time, which was Field of Dreams for me, you notice it in the darker scenes and it is super distracting. This needs to be corrected as it’s an obvious bug introduced with the latest update. Please look into this...

Jun 22, 2019 4:56 PM in response to bspickelmier

I've narrowed down the issue. It has something to do with a new video player overlay system on tvOS 12.3

I believe this to be the case because when I play something with iTunes Movies, the flickering is gone, until I turn on subtitles and whenever a subtitle appears on screen, inside a dark scene, the strobe happens.


With the new AppleTV app, the flickering always happens.


So this leads me to believe it has something to do with (invisible) onscreen overlay functions.

May 26, 2019 9:52 PM in response to bspickelmier

Yes I have, it doesn’t affect Netflix Dolby Vision content, or Movies Anywhere HDR, or Vudu Dolby Vision or HDR, I play Field of Dreams in Movies Anywhere in 4K HDR and the issue doesn’t occur there, only iTunes purchased, I have Field of Dreams for iTunes as well and it happens there, dark shadow area strobe effect. I have the proper HDMI cable also, Belkin and also Monoprice certified cables, tried both and the issue persists. All started with the 12.3 update...

Jun 19, 2019 3:05 PM in response to bspickelmier

Hi guys,


has any of you tried the iTunes tip and THEN tried playing a movie with Apple TV player? I am asking this because I had the "strobe" problem, tried few things, nothing worked. Then I got here, read tips, tried playing a movie with iTunes player and then switched over to the standard player - the strobing was gone. Now I cannot recreate the problem. It's as if it's gone. I really doubt that this was the "cure" but I thought I'd ask, maybe someone hit the same thing. I hate to know the issue existed, solved itself and I don't have a clue why.

May 25, 2019 9:22 PM in response to bspickelmier

I’m having the same issue after the 12.3 update. The flickering on dark areas happens only when watching HDR content (It does not happen on Dolby Vision). I’ve also tried different chroma and frame rate settings settings on the Apple TV, but the flickering does not go away.


At at first I thought it was my tv, but after using my other streaming devices I realized it was the Apple TV. Hoping Apple becomes aware of this issue.

Jun 2, 2019 9:00 PM in response to TheJesusFish

So, that works! Well, mostly; it still seems to do it if I bring anything up onscreen while the movie is playing (the time bar, chapter select, etc), but then the flickering stops once any of the HUD stuff goes away. At least in the few scenes of Harry Potter 6 I watched, this trick worked (I compared the same scenes in the TV app and the flickering was just as prominent as ever). I don’t think it’s my TV because I surely would have noticed it before; I’ve watched several movies with my wife and friends and none of us ever noticed it until the 12.3 update, so I’m gonna still go with that.


So, I’ll leave it unsolved because it’s still an issue, but it looks like the workaround...works. Thanks Jesus Fish!

Jul 24, 2019 8:38 AM in response to bspickelmier

It happens in very specific cases I think. Because the scene in American sniper is not even that dark. I think it had something to do with met data that contains exactly the same information as the subtitles at the same time or something.


The scene in American sniper has a lot of subtitles coming in rapidly after each other. That’s probably why it is so awful to watch. The rest of the movie I didn’t noticed the problem a lot. Only if I really searched for it.


im quit confident that it’s fixed.

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Strobe effect with HDR on Apple TV

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