-f, --format FORMAT video format code, specify the order of
preference using slashes: "-f 22/17/18". "-f mp4"
and "-f flv" are also supported. You can also use
- the special names "best", "bestaudio", and
- "worst"
+ the special names "best", "bestaudio", "worst",
+ and "worstaudio"
--all-formats download all available video formats
--prefer-free-formats prefer free video formats unless a specific one
is requested