Hi
In the past I have used a program called 'DeVeDe', it's in the Ubuntu repos.
But there may be a problem with it now, look at the DeVeDe website for details.
I haven't used it for a while so I don't know for sure.
These days I use 'tovid' but it's CLI. There is a GUI but I've never used it.
This is the website for DeVeDe:-
http://www.rastersoft.com/programas/devede.html
This is the link for tovid:-
http://tovid.wikia.com/wiki/Main_Page