Agian I guess nero can do the job for you, you can burn them as video format from the options available.
In case u need to write a dvd- video: (in case u use nero)
1. First start a new compilation . File-->new compilation
2. Select "DVD-video" from that list.
3. Now do other formalities and u r done now
Also check digit May 2005 issue.
Page 46.
They use the freeware :avi2DVD