And in case you were not aware you don't need a computer to copy files to AVPlayer. If they are on iPad via a download manager or most browsers that support file downloads you should be able to use "Open with..." and select a media player app which sends a copy of the file to that app to view in it's sandbox. When this feature rolled out in iOS matched with media players that support various non-standard iOS video formats, it allowed me to totally "unchain" my ipad from my laptop -- which has collected more dust in the last 3 months than it has in then 4 years since I got it..
I suppose then that you have a Jailbroken iPad, and have a Cydia app for downloading torrent files. Or from were do you download the MKV files?