There are methods of putting SVCD to DVD (not all players play svcd-dvd) without re-converting the video (audio needs resampling of course).

More info...
http://www.dvdrhelp.com/forum/viewtopic.php?t=129786

(and the site in general)

The methods are as I recall was based
on "patching" the header of the files (as Proton mentioned). Never done a conversion like that "yet" though.