TunesKit Video Cutter for Mac is an all-in-one video trimmer and joiner well designed to help you cut any video and audio file into small sections by removing the unwanted footages with 100% lossless quality retained. Once trimmed, you can edit the video/audio with essential effects and convert the segment to most popular media formats and mobile devices.
To get started, you should install the free trial version of this app on your macOS. Then simply follow the guide here to cut large videos to other formats with TunesKit Video Cutter for Mac step by step.