Glitches in exported video

Desperate for some advice here!

I create videos for YouTube, usually 15-30 minutes in length. I've been at it for over a year and not had any significant problems until now.

I'm editing with Version 10.6.10 of FCP and have a 2019 MacBook Pro running Sonoma 14.0.


I shoot videos in 4K25p and export in 4K as well.

Here are my export settings:


The last two videos I've made have had glitches in them.

  • Video freezes, white block appears in lower half, video resumes after ~30 seconds and there are no more glitches.
  • Same again: Video freezes for about 30 seconds and then resumes as normal. Audio remains for a few seconds after the video freezes, but then both are gone.


Exporting again actually changes where the glitch is, but doesn't remove it.

I tried exporting in 1080p and the sharing bar got stuck again - but the video appears to have no glitches. I would love to still be able to export in 4K though.


One thing I've noticed is that the progress bar for 'Sharing' will get stuck at a random % (coincides with where the glitch is), however the video does 'fully' export, with the mp4 automatically opening in my QuickTime Player afterwards, and the predicted GB showing accurately in my files. There are no transitions or overlays at these times, it seems completely random.


I've also suddenly been having red bars appear where the audio wavelength should be, though I'm unsure what the cause is - they appear and vanish randomly (sorry I dont have any screenshots, it looks like this though):


I thought the issue was with my hard-drive, but I'm using a brand new one now and the same issue has occurred. I use the LaCie brand and haven't had any issues in the past. I have plenty of storage on both the hard-drive and Mac.

Wondering if it's the OS I'm running? That is the only change I've made in the last few weeks. I checked the App Store and my FCP is fully up to date.



MacBook Pro 16″

Posted on Oct 12, 2023 12:54 PM

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Glitches in exported video

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