For 11.04’s clive version 2.2.13, the youtube video URLs are throwing the following error.
error: no match: `(?-xism:fmt_url_map=(.*?)&)'
and the solution for this is to pick the package from Ubuntu 11.10 oneiric which is of version 2.2.25-2 as of this writing.
Clive is very useful commandline utility to extract video from video websites like youtube.com and vimeo.com. The recent update to youtube url is causing clive to fail for any youtube url, giving unknown http/404 errors. Although the upstream is fixed the ubuntu package is still not updated with the same version i.e as of this writing clive_2.2.12-1.
In the meantime you can download the debian package for sid from here.