clipgrab (downloading video tool)

ClipGrab is a GPLv3-licensed Open Source project and of course
also available for Linux.

ClipGrab is a free downloader and converter for YouTube, Vimeo,
Metacafe, Dailymotion  and  many other online video sites,  see
more in: http://clipgrab.org/faqs/supported-sites

It converts downloaded videos to  MPEG4, MP3  or  other formats
in just one easy step.

NOTE: This suggests FFMPEG with libmp3lame  support enabled for
video conversion to MP3 format.

* For  downloading 1080p videos from  Youtube  you need a newer
version of ffmpeg than currently available on SBo.