iMovie won't play on Quick Time Player or transfer to YouTube after saving on macOS Sequoia 15.5

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Level 1

4 points

iMovie won't play on Quick Time Player or transfer to YouTube after saving on macOS Sequoia 15.5

Problems with iMovie. (MasOS Sequoia 15.5) After making a short movie Isave it to my Mac but then it won't play on Quick Time Player (message says this is not compatible)and won't transfer to YouTube. I have played it back on iMovie and it's fine, and checked every individual clip on QTP, and they play fine, but then the whole movie seems to be a problem. iMovie won't Quit and I have to actually pull the plug to close it down (I then get a message telling me I have to Force Quit iMovie if I want to shutdown. I have managed to do the basic stuff like delete the preferences, but that didn't help. I'm hoping the community can.

[Re-Titled by Moderator]

Original Title: iMovie problem

iMac 24″, macOS 15.5

Posted on Jul 23, 2025 12:56 AM

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Answer 1

BenB

Level 6

13,124 points

Jul 23, 2025 6:53 PM in response to Bermondsey

How are you exporting the project from iMovie?

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Answer 2

Bermondsey Author

Level 1

4 points

Jul 23, 2025 11:59 PM in response to BenB

By clicking on Projects, then Share Project, Social Platforms, choosing a resolution, and finally the folder destination. It's worked that way forever and ends up in the right folder with a .mov suffix.

I've just gone through the above steps and tried to play the video and got this message: The document Day 1961 Final - 1080WebShareName.mov” could not be opened. The file isn't compatible with Quick Time Player

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