Yeah, the title looks like a spam post, because (for some reason) there's an inordinate amount of shady-looking video conversion software on the Internet.

It's precisely for this reason that I'm asking here.

How do I (on Linux, preferably, but I'll deal with Windows or Mac solutions) convert my Windows Media Center recordings (WTV format) to something more useful (such as MP4)?

I'm going to be retiring the Windows Media Center box in the next couple of weeks (I've got an HDHomeRun arriving tomorrow), but I'd like to keep my recorded stuff.