There are no such things as "stupid" questions. However if you think your question is a bit stupid, then this is the right place for you to post it. Please stick to easy to-the-point questions that you feel people can answer fast. For long and complicated questions prefer the other forums within the support section. Before you post please read how to get help
nadir, probably you need mplayer, smplayer and mozilla-mplayer. The codecs are easy, gstreamer, good ,bad , ugly, ffmpeg and w32codecs. If we are talking Debian based all the other dependencies will get pulled in.
i would try mozilla-mplayer first. try if gecko-mediaplayer is availiable.
as said: its unknown territory for me. if exploder wouldnt have told it to me short ago i wouldnd have got that idea. he is the one to get the thanks. (just for clarification, though thats the way community works: passing info... or not?).