We had some discussion about a free TiVo alternative: https://trisquel.info/en/forum/tivo-solution
Fabian has posted a link to his solution (which is written in French though): http://www.fabianrodriguez.com/blog/2013/01/18/exit-la-tele-par-cable-bienvenue-a-lenregistreur-numerique-libreI do not know what you mean by F but typically composite Video in (Yellow) is available by using one of those cheap old analogue TV cards available.
