pipcornyou can spawn a picture-in-picture YouTube player on your Mac without installing anything!
Install it globally using
npm, or run it directly using
npx pipcorn https://www.youtube.com/watch?v=dQw4w9WgXcQ
Basically it’s a wrapper around
ytdl (to get the MP4 URL) and
open-pip-cli (to open a PIP player).
Love the name, too.