Had to resort to using ffmpeg to create a timelapse because iMovie doesn’t let you do 4:3 movies for some reason, and I didn’t want to download a new video editor. In a directory where the photos are named photo-00001.JPG to photo-00456.JPG (using macOS Finder’s batch renaming tool) ffmpeg -f image2 -r 10 -i photo-%05d.JPG \ -c:v h264_videotoolbox -b:v 8500k \ -preset slowest -profile:v high \ -allow_sw 1 output.mp4 -r 10 tells it to use 10 images per second