Screen Recording Desynchronization Issue

Matching a screen recording with audio playing externally can be very difficult and will depending on the specifics of your project and the tools you are using for synchronization. 

If you're looking to match a screen recording with external audio on an iPhone 14 Pro Max, you can use the iMovie app or a third-party apps to make the process easier. 

I don’t think screen recording can be synchronized because of the screen having a variable refresh rate.

Apple doesn’t publish any specs on this, so confirming my suspicions is not really possible, except for your real life experience.

It’s also possible that screen recording is not time base corrected to maintain a specific frame rate. Only Apple engineers will be able to confirm.

Another possibility is the streaming of YouTube videos varies the rate at which they are delivered. This could result in the video speeding up and slowing down over time.

I can probably think of ½ a dozen other possible scenarios.

I think it’s highly unlikely related to the update. I suspect one of the variables was consistent long enough for your short test to work. This may be acceptable to you and your needs. The real test is a long recording time of 30 to 60 minutes so the small errors in a short recording, multiply over a longer period of time, and the slip is easily noticed.

But as long as it’s working for your recording needs, you’re all set.

AkiraHojo wrote:

I doubt this error is resulted from a recent iOS update.

It's not always the iOS update's fault!  Many things can cause phone problems.  If you tell people you think it's an iOS update, it might make it harder to fix or find a solution for the real issue.

Remember, the right question often leads to the solution!

iOS updates aim to enhance user experience, boost security, and fix bugs rather than disrupt core features. The majority of the issues after updates might stem from underlying, unmentioned factors. Updates won't typically alter personal data but may refine settings or features. Backup before major updates for safety. Review Apple's update details and backup advice for a smooth process.

Kindly consider checking your settings and addressing any device issues before attributing the issue to external factors. This could be a pure coincidence that the iOS update affected the iPhone functions.

Before initiating a standard iOS update, it's advisable to create a backup. Have you completed this step? If yes, proceed with the restoration from the backup.

See what each update does: About iOS 18 Updates, About iOS 17 Updates, About iOS 16 Updates, About iOS 15 Updates, About iOS 14 Updates, About iOS 13 Updates, About iOS 12 Updates, and so on...

I notice playback of YouTube videos with audio issues all the time. I play it one day it’s out of sync. Next day or two I watch again and it’s now synced. This happens frequently.

Screen recording another recording has inherent issues. But if it works for your needs, you’re good to go.

What app are you playing the video back in?