$ youtube-dl -F youtube.com/watch?v=MtO589eu-Rc
[youtube] MtO589eu-Rc: Downloading webpage
[youtube] MtO589eu-Rc: Downloading video info webpage
[youtube] MtO589eu-Rc: Downloading MPD manifest
[info] Available formats for MtO589eu-Rc:
format code extension resolution note
139 m4a audio only DASH audio 49k , m4a_dash container, mp4a.40.5@ 48k (22050Hz), 564.06KiB
140 m4a audio only DASH audio 130k , m4a_dash container, mp4a.40.2@128k (44100Hz), 1.46MiB