mencoder test.mkv -ovc lavc -lavcopts vcodec=mpeg4:threads=8:vbitrate=3000 -oac copy -o test.avi
-oac copyneeds to be replaced with
-oac pcm. I don't know why.
This is very helpful because my modded Xbox that I use for a media center can't play .MKV files. My first try with this was in Windows, but as usual, all of the programs available to do stuff like this are either horrible, full of spyware, not free, or otherwise bad. TAKE THAT, WINDOWS USERS. ::evil and non-nerdy linux laugh::
Hooray! Hopefully I'll have a post sometime soon with something less nerdy and more tangible.