list supported sites

youtube-dl --list-extractors

show available versions

youtube-dl --list-formats https://www.youtube.com/watch?v=ztbC9_5kJLY

download specific version

youtube-dl --format 22 https://www.youtube.com/watch?v=ztbC9_5kJLY

youtube-dl --format best https://www.youtube.com/watch?v=ztbC9_5kJLY