Hey, friend
to buy xvid to DVD-R, i like to use this iMacsoft DVD Creator for Mac, it can burn a dvd from various video files with 1:1 quality.
http://www.imacsoft.com/dvd-creator-mac.html
With smart DVD menu creating functions, iMacsoft DVD Creator for Mac can help you create stylish menu with menu template, and background music, picture, menu topic of your choice to make personalized DVD movies.
i hope it can help you