Help with video converting

I've been looking for an effective Matroska (.mkv) video converter, but have failed to do so miserably. Does anyone have any suggestions for one?

What do you want to do exactly ? And Mkv is not a codec, it's a container. You have to extract the differents tracks (videoa, audio, subs), then re-encode them together, with VirtualDubMod fpr example.

For example I have a Matroska video complete with subs and audio. How do I create a mp4 file version of that?

can't you simply demux the mkv contents and put it in a mp4 container?

really? how do you do that? and what do i need?

you'll need mkvtoolnix + MKVextractGUI + mp4box.

If all else fails: http://tom.zickel.org/vlcmp4/

I use any video converter. You cant control the language, but the subtitles come up in the settings. i use it all the time to get anime onto my psp