- Install youtube-dl
brew install youtube-dl
- Save your youtube cookies
** Open Google Chrome
open /Applications/Google\ Chrome.app/
** Install cookies.txt
https://chrome.google.com/webstore/detail/cookiestxt/njabckikapfpffapmjgojcnbfjonfjfg
** Open your youtube playlist, and save cookies
- Open your youtube playlest
- Click 'cookies.txt' icon
- Copy 'cookies.txt' content
- Paste to your new cookies file
- Download playlist to aac files
youtube-dl -x --cookies=<your cookies file path> --audio-format=aac <playlist url>