MacXDVD Software has released macXvideo, a free video processing tool specially designed for 4K and other UHD videos.
The utility offers a way to edit, resize, compress and transcode 4K videos. You can cut, trim, rotate, merge, split videos, add personalized subtitles, adjust playback speed and audio volume, and more.
macXvideo requires macOS 10.6 or later. for more info go to https://www.macxdvd.com/macxvideo/ .