-    -f, --format FORMAT              video format code, specify the order of
-                                     preference using slashes, as in -f 22/17/18
-                                     .  Instead of format codes, you can select
-                                     by extension for the extensions aac, m4a,
-                                     mp3, mp4, ogg, wav, webm. You can also use
-                                     the special names "best", "bestvideo",
-                                     "bestaudio", "worst".  You can filter the
-                                     video results by putting a condition in
-                                     brackets, as in -f "best[height=720]" (or
-                                     -f "[filesize>10M]").  This works for
-                                     filesize, height, width, tbr, abr, vbr,
-                                     asr, and fps and the comparisons <, <=, >,
-                                     >=, =, != and for ext, acodec, vcodec,
-                                     container, and protocol and the comparisons
-                                     =, != . Formats for which the value is not
-                                     known are excluded unless you put a
-                                     question mark (?) after the operator. You
-                                     can combine format filters, so  -f "[height
-                                     <=? 720][tbr>500]" selects up to 720p
-                                     videos (or videos where the height is not
-                                     known) with a bitrate of at least 500
-                                     KBit/s. By default, youtube-dl will pick
-                                     the best quality. Use commas to download
-                                     multiple audio formats, such as -f
-                                     136/137/mp4/bestvideo,140/m4a/bestaudio.
-                                     You can merge the video and audio of two
-                                     formats into a single file using -f <video-
-                                     format>+<audio-format> (requires ffmpeg or
-                                     avconv), for example -f
-                                     bestvideo+bestaudio.
-    --all-formats                    download all available video formats
-    --prefer-free-formats            prefer free video formats unless a specific