I love fan noises while sleeping. My sleep quality totally changed for the better since I started.
I was downloading a fan noise audio track from YouTube to put in the Music app using
youtube-dl, like this:
youtube-dl ciD52cwJGCs --extract-audio --audio-format mp3 --prefer-ffmpeg;
But after downloading the file, I got the error
ERROR: ffprobe/avprobe and ffmpeg/avconv not found. Please install one.
To solve this on my Mac I had to run
brew install ffmpeg
It took a while, then I ran the command again and since the file was already downloaded, it was a quick process to get the mp3.