To import Panasonic GH5 4K to iMovie flawlessly, an ultimate solution we found would be to transcode/compress to 1080p AIC for iMovie 8/9/11.
Panasonic GH5 delivers the highest quality with 4K in mp4 or mov format. Whereas, if you import Panasonic GH5 4K videos into iMovie, users always encounter video and audio problems, as the H.264 codec from GH5 is efficient, but simply isn't designed for editing. In addition, although iMovie has boasted the capacity to handle with 4K files without much problem, it is extremely hardware intensive especially for working on a old computer. So, before transferring Panasonic GH5 4K files to iMovie, you'd better convert GH5 4K MP4/MOV to 1080p AIC for smooth editing.
Along with some help from a top 4K video converter like Dimo Video Converter Ultimate for Mac, it can be done quickly and easily. It is capable of converting Panasonic GH5 MP4/MOV to Prores, AIC, DNxHD, MOV/MPEG-2 for smoothly importing and editing in various non-linear editing systems (NLE), including iMovie 08/09/11, FCP 6/7/X, DaVinci Resolve 9/10/11/12, Avid Media Composer 5.5/6.0/6.5/7/8, Adobe Premiere Pro and more.
If iMovie or other NLEs is hard to handle your 4K files, with this tool you can downscale 4K to 1080p effortlessly. Below is how. Just take a look at the brief guide below.
Software: https://www.mediadimo.com/video-converter-ultimate
Download: https://mediadimo.com/download/mke/index.php?pcode=vcw0
Buy: https://www.swreg.org/cgi-bin/s.cgi?s=145698&p=145698-18&q=1&v=0&d=0&rc=45K2D47HSJ&a=v
Source: Transcode Panasonic GH5 4K to iMovie for Editing
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