I've got a 1.8 gigabyte high definition Stargate movie in mkv format that I would love to be able to crunch down some without any quality loss. I normally use Megui to convert other formats to smaller mkv format with no quality loss but I'm not sure if that program can crunch down a file that is already mkv, if I need to find a program that can or if I need to find a program that can convert mkv into another format and then I can use megui to convert into a smaller mkv format. *shrugs*