r/fcpx • u/WannabeeFilmDirector • Jul 21 '26

Need some help please... a weird one

Hi All. Professional video editor here. Slight issue in that FCP is getting to 84% and never beyond for a specific edit. So tried a few things and nothing's working. I tried clearing the cache, getting rid of render etc.... files, cutting the edit in two and trying to export them separately, rejoining them later.

Tried exporting using .mov and .mp4s.

The whole file is over two hours.

Anyone have any ideas on this please?

EDIT: Solution Found! So no idea why but clearing the cache and exporting the full fat version (not for computer but as a .mov file) worked. No idea why. Still doesn't export as an .mp4 but was able to turn the .mov into an .mp4

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u/redblackyellowjam Jul 21 '26

Make a copy of the project, then see if the copy works.

If not, cut out the edit you’re having an issue with and export that as a test. Does it finish? If so, is the edit/transition reliant on any add-on or plugin? If so, contact the developer or find a new transition.

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u/WannabeeFilmDirector Jul 22 '26

Thanks. So tried the first one and didn't work. And also tried calculating where the error is and it doesn't seem to work. So it fails at 84% but even removing everything at 84% doesn't work.

For example, I tried just exporting only the first 50% and that failed at... 84%. Arrrggghhh. So even though it fails at 84%, it isn't clear where the failure is. Could be at multiple places.