Switch from libquvi to youtube-dl
Quvi is unmaintained, see http://quvi.sourceforge.net/news/
youtube-dl is a Python script exposing both a stable command-line interface and a Python API, the first one is probably easier to work with from totem-pl-parser.
This would fix most of the websites not working anymore on a recent totem, as well as add support for a ton of newer websites.