you will need the
IVTV driver. currently ivtv only works properly with
mythtv
ivtv is a royal pain to install properly on mepis with the stock kernel, however some versions of mepis (3.3.1 does 3.4.3 does not) come with ivtv already installed making for a much simpler setup.
good luck with getting it set up, feel free to ask more questions if you need help or advice regarding this