cclive is a command line tool for downloading videos from Youtube and
other similar video websites that require Adobe Flash to view the
video content. It has low memory footprint compared to other similar
tools. It is a rewrite ot the clive software in C++, and it is free
software, licensed under the GPLv3.

If you put the lines below in $HOME/.ccliverc, the output filename would
look nice.

filename-format=%t.%s
subst=s<\s>{_}g