You can download a great converter called SUPER at
http://www.erightsoft.com/S6Kg1.html
The website is a bit user unfriendly so basically at the first page scroll down and click download, then click download and use, then scroll down again and click download.
When you install it, first select Nintedo DS as your ouyput container, the drag your vid into the box at the bottom and then press Encode (ACtive Files)
Hope it helps,
Matty
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