movies on USB drive for TV

I just got a 55-inch Samsung Model LN55B650T1FXZC and Page 52 of the manual lists the file types for movies: avi, mkv, asf, wmv, mp4, 3gp, vro, mpg, mpeg, ts, tp, and trp.
If I download a movie of a different format and want to put it on my USB stick for the TV, I first convert it at