Ran into an issue today where audio was working normally in Final Cut Pro X 10.3.2, but the exported video had no sound. The video and sound were originally recorded using a Canon G7X Mark II.
The fix was to delete Final Cut Pro X preferences, as detailed by Apple here. In short…
- Quit FCPX.
- Press Command-Option when re-launching FCPX. You’ll be given an option to delete your FCPX preferences.
- Delete your preferences.
That will definitely result in some interface trauma for you, as FCPX won’t remember where your libraries are. I’m not sure what other settings you’d invested in that might also be forgotten — probably a lot of things. I’m still relatively new to FCPX, so the hit wasn’t too hard to handle. But still. Yuck.
Yuck or not, that worked. Once I pointed FCPX at my libraries and built a new project for my simple video, exporting rendered not just video, but audio too. And all was right with the world.
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