Okay, the new version is hosted, sorry it took me so long.

Instructions are as before:
Download: Mopt.tar
Untar with
tar -zxvPf Mopt.tar
Then make executable:
chmod +x /usr/bin/mplayer-opt

This version is identical to the last one iliaden posted, I'm really sorry I haven't been able to make any changes, my schedule is kind of hectic right now.

TODO:
--FIX: Script now crashes if not given a filename as a command line paramenter
--ADD: Support needed for post-processing low-res videos
--ADD: mime-handling needed