- help='video format code, specify the order of preference using slashes: -f 22/17/18 . -f mp4 , -f m4a and -f flv are also supported. You can also use the special names "best", "bestvideo", "bestaudio", "worst", "worstvideo" and "worstaudio". 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')
+ help=(
+ 'video format code, specify the order of preference using'
+ ' slashes: -f 22/17/18 . -f mp4 , -f m4a and -f flv are also'
+ ' supported. You can also use the special names "best",'
+ ' "bestvideo", "bestaudio", "worst", "worstvideo" and'
+ ' "worstaudio". 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.'))