What is latest Quicktime Player?

The version of QuickTime Player is bound to the version macOS. They’ll update together, if version changes are available. I have the same version. My iPhone recordings play well? I can't replicate your issue.

For macOS troubleshooting, try these:

• How to use safe mode on your Mac - Apple Support. ‘Safe mode’ can help you to determine whether an issue is caused by software that loads as your Mac starts up.
• How to test an issue in another user account on your Mac - Apple Support. If an issue stops happening when you log out of your macOS user account and log in with another, the issue could be related to the files or settings in your user account.

Let us know the results of these tests. Then we can advise on subsequent steps.

I had exactly this issue: a complete freeze after I upgraded to Sonoma and tried to play back .mov or .mp4 files using Quicktime or TVapp: I identified that this happened only when my external monitor was connected. Since my external monitor (LG) cost over £1000, it's very annoying, and Apple's response has been very disappointing: I reported to Apple and they did little to reassure me that the problem was being looked at.

I have defaulted .mov and .mp4 files to open with a third party video player, rather than disconnect my external monitor.

I haven't heard of a fix, but please post if you hear of one! I think the best thing is to contact Apple and report the issue directly to an Apple staff member, so that more pressure is put on the Apple software developers to produce an update to Sonoma.

I'm guessing that the delay in an update, even if they've found a fix, is that there are other bugs they want to take care of at the same time, so rather than updating now, we have to wait until other things have been sorted before the next Sonoma version is released. At least, I hope that's the reason for the delay.

But if anyone knows of a temporary fix, do tell us!

In the last few days I've upgraded to Sonoma 14.1.2, but the problem is still there: the crash isn't quite as bad, as when I power up again my windows are correctly sized and located, but I still have to power down to get out of the crash.

Same here. Quicktime has been freezing for a while. I unplugged the monitor and everything is fine. I'm also have Sonoma installed.

I am also facing the same issue while using Quicktime player as I am using a Samsung monitor, is there any way to fix this problem, currently I am using VLC player

If the media files had DRM, then the lack of HDCP support (if applicable) could be an issue. That could be in the cable, adapter, or monitor. Verify for HDCP support.

Else I wouldn’t know. Then hopefully someone else has more ideas.

Hi! I'm having the exact same issue! I'm using a Macbook Pro 14' M1 Pro (2021) and also recently updated to Sonoma 14.1 (16GB).

I'm using the iPhone to record football matches through OBS and I need to duplicate 4 of the same video to go to the different moments in the match. I've tested the recording output file of both .mp4 and .mov however it hasn't helped.

I have tried using VLC instead, and that has solved the problem. The only thing is that I needed to follow a guide to create an apple script to create 4 duplicates of the video. This has solved the problem of freezing, so it seems it is a Quicktime issue?