All to avi is a free program that can convert mkv, ogm, etc. to avi. You can do each file one at a time or have all mkv in a folder and click on add folder, it asks you which file type so you would choose mkv than it will convert each file in that folder to avi. It takes about 5 min per each file, if you have a dual audio you have to select which audio you want and same thing with subs, I believe that it will embed the subs into it so unless you need them don't ad subs.
These are some of my other pictures that I use for my backgrounds:
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