I think a simpler way, if you can’t go back and re export, would be to use iDVD. Its drag and drop. Just place your MP4 in iDVD, it will encode, make a menu, a button, everything.
Run iDVD, select 4:3 or 16:9, I think you should select 16:9 as your movie is 2048×1152.
Then name the DVD something other than ‘My Great DVD’, which is the default name.
Then decide where to save it.
Select a good looking theme.
In the Project menu, go to Project info and select NTSC or PAL as desired. Set encoding preference.
Then drag your mp4 into the main window. iDVD will make a button.
You can preview the DVD by hitting the Play button at the bottom.
When you’re satisfied, press the burn button, pop in a blank DVD and you’re done – after the DVD finishes burning.
Couldn’t be simpler.
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Neil Sadwelkar
neilsadwelkar.blogspot.com
twitter: fcpguru
FCP Editor, Edit systems consultant
Mumbai India