Audio not matching video when dropped into timeline

Using Intel iMac 27" (Sonoma 14.3.1) with FCPC (10.7.1). All of a sudden, whenever I drop a video into the timeline the video and audio do not match up. The audio lags significantly, about a second. When I import it into FCPX and click on the imported video, everything is fine. The lag comes when I drop it into the magnetic timeline.


Anyone have a suggestion on how to fix this???

iMac 21.5″, macOS 10.12

Posted on Mar 12, 2024 1:50 PM

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10 replies

Mar 12, 2024 2:44 PM in response to Gr8fulted


Is that the size you want to deliver, HD not 4K?


The frame rate’s wrong, just wrong enough to be a nuisance. You should change the frame rate to 25. You can’t change it while there are clips in the project. Select everything and use Cmd-X to cut it out. In that window you showed changed the frame rate to 25. Then use Cmd-V to paste everything back into the project. See if that works better.

Mar 12, 2024 2:00 PM in response to Tom Wolsky

Ok, I hope I'm giving you what you need. This is a 4K video recorded outside at 25 fps. I used the DJI Osmo Pocket 3, with the wireless Osmo Mic 2. The information section of FCPX says Original (HEVC) Optimized (Apple ProRes 422), and Proxy (Apple ProRes 422 Proxy).


I've used this setup several times before but at 30 fps and have never had this issue. Today is a first.

Mar 12, 2024 2:17 PM in response to Tom Wolsky

I am sorry if I am not fully understanding what you are needing.


The audio was recorded as part of the video file, yes. When I watch the clip on my desktop, everything if just fine. When I click on it in the imported video area of FCPX, it appears to be just fine. But when I drop it into the magnetic timeline, there's a huge lag in the audio.


I'm not sure where to find the info on the audio sample rate and project properties.

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Audio not matching video when dropped into timeline

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