When previewing a long project in DVD Studio Pro, in some instances the audio and video may be out-of-sync unless the following steps are taken.
The preview is generated from three different decoders (audio, video and navigation) without a common time base. This occurs with especially long tracks or when SKIP actions using markers are involved. This only affects the preview mode.
Solution
For a more accurate preview, multiplex your project and preview it in Apple DVD Player.
2. In Apple DVD Player, make sure the option "Add 'Open VIDEO_TS' menu item to File Menu" is selected. This is under the Advanced Controls tab in Apple DVD Player preferences.
3. In Apple DVD Player, choose Open VIDEO_TS from the File menu, locate the VIDEO_TS folder you created, and preview the project.