Ok,
I'd recommend SUPER
Download page is here (mirrors at the bottom)
http://www.erightsoft.com/S6Kg1.html
it's never let me down
supports all kinds of video inputs and outputs (including flash flv, mpeg2 and dvd VOB)
dvd is basically (save a few minor bits 'n bobs) the same as mpeg2
if you just want the thing to start playing, you can get SUPER to output the FLV's straight to VOB
If you want to properly author a DVD (design menus, add subtitles or additional audio tracks, whatever)
then output to mpeg2, and I'll link you to a proper DVD authoring program
but if you just want the thing to play without any fancy stuff, output straight to vob