Two settings decide almost everything about how an Apple TV looks, and the default configuration gets one of them wrong for most people.
Turn Match Content on
Settings > Video and Audio > Match Content. Both switches on.
Match Frame Rate is what kills judder. Film runs at 24 frames per second. With this off, the Apple TV outputs everything at 60Hz, which means 24fps material gets stretched across 60 frames using 3:2 pulldown — five output frames for every two source frames, unevenly distributed. On a slow camera pan it stutters, and once you've noticed it you can't stop noticing it.
Match Dynamic Range lets each title play in the format it was actually graded in. SDR stays SDR, HDR10 stays HDR10, Dolby Vision stays Dolby Vision.
Set the base format to 4K SDR
On current tvOS this is usually Settings > Video and Audio > Format > 4K SDR.
This is the one people get wrong, and it's usually because 4K Dolby Vision sounds like the better option. It isn't. With Match Dynamic Range switched off, setting Dolby Vision as the base format means everything is converted into Dolby Vision, including material that was never graded for it. With Match Dynamic Range on the box does switch back for SDR — but it then spends the day changing modes, and every change is a black flash.
In the converted case your TV applies Dolby Vision tone-mapping to a plain SDR sitcom. The result is the dim, slightly off-colour, occasionally banded picture that people blame on the box or the panel. On several TVs the Dolby Vision preset is also noticeably darker than the HDR10 one, so forcing DV is actively making things worse on exactly the sets people bought for Dolby Vision.
With 4K SDR as the base and Match Dynamic Range on, the Apple TV hands the TV the correct format for each title and switches into HDR only when there's HDR to show. That's the behaviour people think they're choosing when they pick Dolby Vision.
Set 4K Dolby Vision as the base only if you've compared the two on your own set and preferred it.
Then run Check HDMI Connection in the same menu. It takes about two minutes, blanks the screen partway through, and reports what the chain actually negotiated rather than what you asked for.
About that black flash
Turn Match Content on and you'll get a black screen for a second or two every time the frame rate changes — leaving an app's 60Hz interface to start a 24fps film, for instance. Most guides tell you this is normal and to live with it.
It's normal on most setups. It isn't unavoidable.
HDMI 2.1a includes an optional feature called QMS — Quick Media Switching — which uses the VRR mechanism to change frame rate without dropping the link. When it works, the switch is instant and invisible. The Apple TV 4K (2022, third generation) was the first streaming box to support it, added in a tvOS update.
Two conditions, and both matter:
Your TV has to support QMS too. It's optional in the spec, so plenty of HDMI 2.1 sets don't have it. Check the manual for QMS specifically — 2.1 alone doesn't imply it.
Resolution and HDR mode have to stay the same across the switch. QMS only handles a frame rate change. If the app's interface is 4K SDR and the film is 4K Dolby Vision, that's a mode change as well as a rate change, and you get the blank screen regardless.
That second condition is why people with QMS-capable gear still see the occasional flash and assume it isn't working. It is — it just can't cover that case.
If judder survives all of this
Confirm Match Frame Rate is actually on, then look at the TV. Some sets need their own 24p handling enabled — LG calls it Real Cinema, and Filmmaker Mode turns on the correct behaviour on most brands as a side effect of disabling everything else.
What you're checking for is that the TV is displaying 24fps at a clean multiple, rather than doing its own internal conversion on top of what the Apple TV already sent correctly. Two devices both trying to fix judder produces worse judder than either alone.
If brightness jumps between titles
That's the format switching working as designed — different masters have different peak brightness, and you're seeing the TV re-tone-map.
A 4K SDR base minimises it, because fewer titles trigger a mode change. If it's severe or accompanied by flicker rather than a step change, suspect the cable: a marginal one drops HDR metadata intermittently, and the TV falls back to a different tone map mid-playback.
For a picture that's dim or washed out rather than inconsistent, that's a different problem — HDR too dark or washed out covers the TV-side settings. And if the fault is stepping in gradients specifically, see color banding in HDR mode, which is a bit-depth issue rather than a format one.
FAQ
Dolby Vision or SDR as the base format? 4K SDR, with Match Dynamic Range on. The box then switches into Dolby Vision for genuine Dolby Vision content and leaves everything else alone.
How do I stop judder? Match Frame Rate on. If it persists, enable the TV's own 24p mode — Real Cinema on LG, or Filmmaker Mode generally.
Why does the screen go black when a film starts? The frame rate is changing and the HDMI link renegotiates. QMS removes it, but both the source and the TV need to support it.
Does my TV support QMS? Check the manual for QMS by name. It's an optional part of HDMI 2.1a, so plenty of 2.1 sets don't have it.
I have QMS and still get the occasional flash. QMS only covers frame rate changes. If resolution or HDR mode changes at the same time, the link still has to drop.