DVDA is going to ensure a compliant video. This is to say that Vegas can render an mpeg at 12Mb bit-rate, but this won’t really work in a DVD player. DVDA will re-compress this video, so your product will work. On the File menu in DVDA try the Optimize disk function. If DVDA requires a re-compress, find out why. The best practice I have found is to make all my video so that DVDA does not need to change it.
Now then, if you have used the templates in Vegas and still need to recompress, it is because you have too much video (length-wise) to fit on the medium. This is where a bitrate calculator come in. If you need to take a look at this post: forums.creativecow.net/thread/24/935307#935307
I hope this helps,
Jeff
Windows 7 64-bit, ASUS P6X58D, i7 960 3.20GHz, 24.0GB DDR3, 12TB connected storage
http://www.narrowroadmedia.com