I've got some videos on my hard drive that are in .mkv format. I'm trying to convert them to something that I can then use Nero to burn to a DVD, but everything I use turns out looking like crap. Pixelated and the colors are changed. I've tried avi's using different codecs, xvid, dvix, all look like crap. Is there a program that will convert this with out making it look crappy, or a codec that would preserve the quailty better?