When ripping DVDs I usually use the Apple TV 2 preset in Handbrake. I notice that this saves the files in a m4v format. Is this better quality or worse than mp4 format? Also, I want these files to have some value in the future-- meaning that 5 years down the line I want to be able to watch them even if I no longer rely on iTunes or an Apple TV. What is the best Handbrake setting for good quality and small file size (below 2GB). Does XBMC play m4v files?