FCP X - Issue using synchronised clips

If you're using iPhone media you should optimize it. Because the phone's frame rate is often unstable it might be best to convert the files to 30fps at 48K sample rate. You should do this before you sync the video to the audio. Make the project the same frame rate as the media.

You can't do what you want in sync clips. You either need to use multicam clips so you can use the angle viewer or manually sync the clips in a project. Multicam would be easy to use, except you would need to stack multiply copies of the multicam which would mean using proxies and have them on a fast system with fast drives, maybe a RAID depending on how many layers you need to do.

And important to convert all the audio sample rates to 48K.

If you’ve already done it in FCP you might be able to fix it there, but it’s not easy and you have to be careful. With iPhone media watch out for sync drift, starting out ok and getting more and more out of sync.

Post screenshots, caps, whatever you can. Put the screen caps on YouTube with a link.

The conversion is really primarily for the sync, but if this is iPhone media I would recommend you convert or optimize it within the application.

What is the frame rate of the clips, and of the project?

I ask again:

a) what is the frame rate of the Synchronized clips?

b) what if the frame rate of the PROJECT

None of them are what the people recorded. It is all under your control.

Regardless (for now) of the frame rates of the source clips:

What is the frame rate of the synchronized clips you are making?

What is the frame rate of the project where you are using the synchronized clips?

You should make sure the project is then set to 44.1.

Could you post some screenshots of what you're talking about where in the application. Are you syncing music to video clips in the sync clips function? In the multicam function? Where are you doing issue 1?