To export the sequence, I click on File > Export > Quicktime Movie. Then I get to choose where to save the movie, and there are several options for settings. I had left them all as they were…. I am not sure what default the setting is (says Setting > Current Setting), but the other options are Include > Audio & Video; Markers > None; and Make Self-contained Movie.
I had not changed any of the setting, as I thought that the defaults would of course be compatible with the DVD authoring software.
-Angie