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Have a look on freemaker.com as their free video converter will convert most things to the Tab2.
The converter has to be used on a Windows PC and you may not find your exact model to convert too but just use one that is similar as this has worked for me but I can't remember what I used of the top of my head.
I use Handbrake to convert my films for the Tab 2. I don't convert .MP4 or .AVI as the Tab 2 can play them, I use a third party app for this though. I don't know if the built in video player will do it.