Odd Frame Rate 29.68 fps in Live Photos

***Why 29.68 fps***? Is it possible to set up a 30 fps or 29.97 fps frame rate for Live Photos? The problem is a video part of Live Photos in iPhone X in iOS 11.3 uses quite strange variable frame rate – 29.68 fps, that is not suitable for editing presets in FCP or DaVinci Resolve. If I convert Live Photos' frame rate to 30 fps or even 25 fps, a sound slightly or noticeably drifts away from sync at some point. P.S. Live Photos in iPhone 7 (iOS 10) work with 29.97 fps.