well i know a perfect tool which will do everything in one step (i mean converting to vob and then dvd burning). i tried it myself and was fully satisfied 'cause all i needed to do was just one click and then relax. this program has an option "burn dvd"!
flash to video encoder PRO
it also has such useful and great options as:
grab images from your flash file, logo editor, transparent video, frame-by-frame mode... it converts swf/flv to avi/asf/wmv/mpeg without quality loss and problems with audio.
try a free version. i think it's exactly what you need