How to crop a video to square on macOS
I’ll show you how to crop a video to whatever size you want thanks to ffmpeg. I use this method to crop 16:9 iMovie video to 1:1 square video to share in my Instagram.
To crop a video you need ffmpeg which is a tool to manipulate the video file. If you have Homebrew simply run brew install ffmpeg in a Terminal window.Once Homebrew is done with the installation, type: ffmpeg -i /path/to/video.mp4 -vf crop=1080:1080 output.mp4. Then push enter ↵. This will crop the video starting from the center. The result will be a 1080x1080 square video called output.mp4. It’s easy to understand how it works. Just change the parameters to your needs.
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