4K at 25fps?
As far as I can discover, iMovie edits and exports 4K at 30fps.
My camera shoots 4K at 25fps so how will iMovie deal with it?
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I am not a big user of iMovie 10 ( still on and prefer ver 9) but my understanding is that the project properties are determined by the first clip placed in the timeline.
If first clip is 25 fps then the export should be 25 fps even if subsequent clips are not 25 fps.
If first clip entered is 25 fps and the rest are 30 fps and then the first clip is removed/deleted then the export will still be 25 fps .
If you want to maintain the 25 fps from your cam, then make sure a 25 fps clip from your cam is the first clip entered into the timeline on a new project.