video-crossfade is a shell script that quickly crossfades videos for seamless loops.
Download the video-crossfade script and make it available in your PATH.
curl -o /usr/local/bin/video-crossfade -O https://raw.githubusercontent.com/joeyhoer/video-crossfade/master/video-crossfade.sh && \
chmod +x /usr/local/bin/video-crossfade
This script relies on ffmpeg:
brew install ffmpeg