Thank you for the help, it worked! A very obvious solution that I hadn’t thought about 🙂 So a brief summary of what I did, for anyone else encountering this problem:
1) My camera has recorded my video in a 5:4 aspect ratio (As a result about 10 % on each side of the video is lost when exporting to DVD in 4:3 format)
2) The solution is to make a new project and import the old, original one into it. After that use the motion effect to decrease the scale of the entire sequence (in my case downscale to 90 % of original size). In this way the entire video is transfered to DVD, the only ‘problem’ being a pair of small, black bars in the top and bottom of the picture – not really a big deal, and impossible to get around anyway without distorting the pixel ratio.
Thanks again!