Videos on your iPhone sporting seizure-inducing flashing lights and stroboscopic effects can be dimmed automatically to prevent headaches and other health issues.
iOS 16.4 can automatically dim seizure-inducing flashing lights on videos

Videos on your iPhone sporting seizure-inducing flashing lights and stroboscopic effects can be dimmed automatically to prevent headaches and other health issues.
Update your iPhone, iPad or Mac to iOS 16.4, iPadOS 16.4 or macOS Ventura 13.3 to have the Photos app detect duplicates in your iCloud Shared Photo Library.
With iOS 16.4, you can flip virtual pages while reading in the Books app on your iPhone or iPad by dragging your finger from one corner to another.
The new Coverage section in Settings provides warranty details and AppleCare+ information for your device and connected accessories like your AirPods.
A minor change in the iOS 16.4 beta is the new Apple Music queue and loved track alert pop-ups that help communicate to the end user when their action has been successful, but who said you absolutely needed to upgrade to iOS 16.4 to enjoy this feature?
The iOS & iPadOS 16.4 beta includes a number of new Emojis that aren’t currently available to anyone on iOS or iPadOS 16.3.1 or earlier, but as jailbreakers know, there’s always a way to port them over to older firmware.
Apple's Safari browser in iOS and iPadOS 16.4 is gaining support for features like web push notifications, making iPhone web apps work more like native apps.
New emoji characters, like a shaking face or new heart colors, are available on the iPhone, iPad, Mac, Apple Watch and Apple TV with iOS 16.4 and other updates.
The Wallet app on your iPhone provides integrated purchase and order tracking. And now, iOS 16.4 brings new Home Screen widgets specifically for that functionality.
iOS 16.4 code analysis suggests that you might soon be able to view precisely how much battery life is consumed when the iPhone’s Always-On display is used.
A new Focus Filter in iOS 16.4 allows you to automatically turn the Always-On display setting on or off when using a specific focus, like Driving, to avoid distractions.
iOS 16.4, iPadOS 16.4 and macOS Ventura 13.3 bring new Shortcuts actions for Always-On Display, Stage Manager, Lock Screen, Night Shift, True Tone, VPN, etc.