Setting the loop function is critical if the objective is to have no user interaction with a menu. The dvd normally will play as soon as it's inserted into a typical dvd player or computer. Keep in mind the menu is actually still there on an autostart dvd that is set to loop. An actual menu adds stability in playback to the dvd.
The only way to make a dvd without any menu whatsoever is via iDvd's One Step process. This is normally done directly from the camcorder / camera via firewire.
However it is possible to burn a One Step Dvd from a movie or QT file on the desktop also. If you need instructions on exactly how this is done, go to the Help menu w/in iDvd and look up One Step.
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By
sdmacuser at 2009-09-25