[Edited to use yt-dlp instead of the discontinued youtube-dl]
This is a script that I’ve been using for a while now to download video clips. It uses yt-dlp for the list of supported_sites and wget for all others.
Make it executable, put it on the Desktop, then just copy the clip URL to the clipboard and double-click the script.
If your network connection is fast enough, give it a few seconds to buffer and watch the clip with MediaPlayer while it downloads. (This is pretty much what Ubertuber does, only this script works much more reliably… 
)
#!/bin/sh
# The script takes the contents of the clipboard and downloads it
# with either yt-dlp or - if not a supported site - wget
#
# Usage: 0 a) install yt-dlp from HaikuDepot
# 0 b) make script executable and put it on the Desktop
# 1) copy a clip URL
# 2) double click script to download to Desktop
supported_sites="youtube youtu.be vimeo"
destination=~/Desktop
clip=$(clipboard -p)
cd $destination
# Use youtube-dl if the clip comes from a supported site
for item in $supported_sites ; do
if [[ $clip == *"$item"* ]] ; then
# get the clip's filename
filename=$(yt-dlp --restrict-filenames --no-part \
--no-cache-dir --get-filename "$clip")
# download clip in best quality
yt-dlp --continue --restrict-filenames --no-part \
--no-cache-dir "$clip"
# add the clip's URL as attribute
addattr META:url "$clip" "$filename"
# identify file type
# mimeset -F "$filename"
exit
fi
done
# Use wget for anything else
filename=$(basename "$clip")
wget "$clip"
addattr META:url "$clip" "$filename"
# mimeset -F "$filename"The META:url attribute stores the download URL for reference. TIP: To display it in a Tracker window, you can temporarily copy a Bookmark file into the clip’s folder, and activate the URL attribute from the Tracker window’s menu.
I commented out the mimeset lines, because then I recognize the unwatched clips by their generic icon. 