Download a YouTube video playlist
Download MPEG 4 format videos
youtube-dl -i -f mp4 "https://www.youtube.com/playlist?list=PL3FW7Lu3i5JvHM8ljYj-zLfQRF3EO8sYv"
youtube-dl -i -f mp4 "https://www.youtube.com/playlist?list=PL3FW7Lu3i5JvHM8ljYj-zLfQRF3EO8sYv"