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iPhone XS Max Choppy video playback on iPhone XS and XS Max.

snowatom said:
It`s not confined to HDR content only, it is visible on all 24fps content
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Then again it could just be new screens sizes and support for hdr and Dolby and it’s just a bad software bug somewhere in the display driver etc. so every one that got a phone on launch has until the 4th to decide to return or not sad par is if I return I already sold my older phones I’d have to get a new 8 plus lmao but st least it be watchable on videos if not I guess can swap out 3 times then fall under the no lemon law and be entitled to a full refund any way
 
I’m on beta 2. It seems slightly better to me. I note just overriding Autobrightness to max levels seems to stop the stutter for me. Which continues to make me wonder if the phone is doing some sort of PWM or other technique to display 24hz content and its flawed or off just enough that many of us are noticing the stutter.
 
pcorrado said:
I’m on beta 2. It seems slightly better to me. I note just overriding Autobrightness to max levels seems to stop the stutter for me. Which continues to make me wonder if the phone is doing some sort of PWM or other technique to display 24hz content and its flawed or off just enough that many of us are noticing the stutter.
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The phone does use PWM to lower brightness, and it could be that with auto on its more aggressive and makes matters worse with 24p content
It can’t be a software thing as everyone with a max would see it, unless some can’t spot it but it’s unlikely surely?
Problem is we don’t know how widespread it is. If it’s a small number then swapping out at Apple then you’ve a good chance of a no stutter phone. However if it’s widespread as some of the evidence suggests then if we swap out we have a good chance of just getting another stuttery phone!!
 
UKapple73 said:
The phone does use PWM to lower brightness, and it could be that with auto on its more aggressive and makes matters worse with 24p content
It can’t be a software thing as everyone with a max would see it, unless some can’t spot it but it’s unlikely surely?
Problem is we don’t know how widespread it is. If it’s a small number then swapping out at Apple then you’ve a good chance of a no stutter phone. However if it’s widespread as some of the evidence suggests then if we swap out we have a good chance of just getting another stuttery phone!!
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True but not everyone had the charging bug either or reception problems they said 12.1 beta 2 fixed the charging problem so it could still be software related but we all have until the 4th to return if u got it on launch day then that’s 14 days to return u less of course u get 3 swaps which then the lemon law will apply and they have to give u a full refund
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UKapple73 said:
The phone does use PWM to lower brightness, and it could be that with auto on its more aggressive and makes matters worse with 24p content
It can’t be a software thing as everyone with a max would see it, unless some can’t spot it but it’s unlikely surely?
Problem is we don’t know how widespread it is. If it’s a small number then swapping out at Apple then you’ve a good chance of a no stutter phone. However if it’s widespread as some of the evidence suggests then if we swap out we have a good chance of just getting another stuttery phone!!
Click to expand...
True but not everyone had the charging bug either or reception problems they said 12.1 beta 2 fixed the charging problem so it could still be software related but we all have until the 4th to return if u got it on launch day then that’s 14 days to return u less of course u get 3 swaps which then the lemon law will apply
 
Ritte said:
Can you link the youtube-movie you had problem with? I think standard youtube is 30fps. 60fps are marked as 60fps.
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Turn on 'stats for nerds' option in YouTube app which shows this video as 24fps.


  • Hidden figures 1080p 24fps - stutter (SW-decoder).
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Can you link the source of the file? Or, give more details like codec h264/h265, file size, etc.? Was it originally 2160p file transcoded to 1080p?
 
Maybe time for the OP to change title to reflect it’s an issue with 24p video in general
 
Weird thing is I watched a movie for over 15 minutes with no problem and then suddenly the stutters appear
 
Can confirm that disabling auto brightness in the Settings->General->Accessibility->Display Accommodations seems to help this issue a great deal. This isn’t optimal though. It makes me feel pretty confident that whatever it is can be resolved with software updates.
 
Other than Lost in Space, what other video in Netflix is a good test for this issue? My Max seems to be fine after the latest Netflix update. Not seeing stuttering during that snow scene. Not sure if that’s really the case.
 
nlkccom said:
Other than Lost in Space, what other video in Netflix is a good test for this issue? My Max seems to be fine after the latest Netflix update. Not seeing stuttering during that snow scene. Not sure if that’s really the case.
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Like I just said earlier, with auto brightness on I can watch that snow scene sometimes it’s fine, others it’s awful. I can watch a movie and everything great then BAM the stutter begins out of nowhere. Must be conflicting with some process or other. With auto off I get no issue on any content
I’m actually rocking my Xs max with auto off now and brightness about 35%, seems to make hdr look better somehow and saves me some battery life. A little dim outside but I can always adjust it without going full blown max brightness which auto does and wastes battery
 
UKapple73 said:
Like I just said earlier, with auto brightness on I can watch that snow scene sometimes it’s fine, others it’s awful. I can watch a movie and everything great then BAM the stutter begins out of nowhere. Must be conflicting with some process or other. With auto off I get no issue on any content
I’m actually rocking my Xs max with auto off now and brightness about 35%, seems to make hdr look better somehow and saves me some battery life. A little dim outside but I can always adjust it without going full blown max brightness which auto does and wastes battery
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Even with auto brightness off my phone is just slow all around.. Could be the beta 2 but still. Even when there’s no bad stuttering the performance all around is not smooth.
 
teemuwaltteri said:
Even with auto brightness off my phone is just slow all around.. Could be the beta 2 but still. Even when there’s no bad stuttering the performance all around is not smooth.
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You must have a dud phone as I’m on 12.1 too and general performance is fine
 
UKapple73 said:
Like I just said earlier, with auto brightness on I can watch that snow scene sometimes it’s fine, others it’s awful. I can watch a movie and everything great then BAM the stutter begins out of nowhere. Must be conflicting with some process or other. With auto off I get no issue on any content
I’m actually rocking my Xs max with auto off now and brightness about 35%, seems to make hdr look better somehow and saves me some battery life. A little dim outside but I can always adjust it without going full blown max brightness which auto does and wastes battery
Click to expand...

Pretty sure turning off auto brightness disabled HDR, or at the very least disables the phone’s ability to selectively brighten and darken parts of the panel individually (as well as globally). If you play HDR content with auto brightness off it is rendered differently than with it on (highlights are often much brighter, shadows without as much detail).
 
chakalakasp said:
Pretty sure turning off auto brightness disabled HDR, or at the very least disables the phone’s ability to selectively brighten and darken parts of the panel individually (as well as globally). If you play HDR content with auto brightness off it is rendered differently than with it on (highlights are often much brighter, shadows without as much detail).
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Interesting, hadn’t thought of that! Now that makes me want to go back to auto
However, I’m not sure that’s right. Surely the auto brightness feature is just globally altering pixel brightness according to data from the light sensor. With that feature off, why would that prevent the video player software from controlling individual areas of brightness within scenes?
For example my hdr tv has a ambient light sensor that can adjust brightness. I turn that off but it doesn’t prevent hdr from local dimming etc
 
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UKapple73 said:
Interesting, hadn’t thought of that! Now that makes me want to go back to auto
However, I’m not sure that’s right. Surely the auto brightness feature is just globally altering pixel brightness according to data from the light sensor. With that feature off, why would that prevent the video player software from controlling individual areas of brightness within scenes?
For example my hdr tv has a ambient light sensor that can adjust brightness. I turn that off but it doesn’t prevent hdr from local dimming etc
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Yeah turning off auto brightness doesn’t turn off HDR.. You can clearly see when the screen enables HDR
 
Been following this issue. Since i do watch a lot of content on my phone it's important to me. I have 256g max. I notice it only in netflix and only when streaming the video. If i download it it seems fine. I have the same video playing on a X,10.5 ipad pro, S8, 7+ and a 7 all beside my Max to make sure i wasn't going crazy. For me it looks to be something with the streaming player and software related. Yes i tried the auto brightness and so on. I am running the 12.1 beta.
 
This video shows the worst stutter ever on the iPhone Xs. I tried on my iPad, and no stutter. But with the iPhone Xs it’s just plain awful.
 
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snowatom said:
This video shows the worst stutter ever on the iPhone Xs. I tried on my iPad, and no stutter. But with the iPhone Xs it’s just plain awful.
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Nothing here on my max. Just for fun. Maybe uninstall youtube. redownload it and reboot the phone. I recall a few years back some times apps act odd but downloading then rebooting the phone would fix it
 
Tried reinstalling app and rebooting still the same. Also tried on two friends iPhones today (both a Max and a Xs) both did stutter like mine.
 
mi7chy said:
Turn on 'stats for nerds' option in YouTube app which shows this video as 24fps.




Can you link the source of the file? Or, give more details like codec h264/h265, file size, etc.? Was it originally 2160p file transcoded to 1080p?
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I’ve it on my plex server. If you have Plex, PM and I’ll invite you to test the file.
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snowatom said:
It`s not confined to HDR content only, it is visible on all 24fps content
Click to expand...

Not all 24p, equally as not in all HDR.
 
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