Why is it not possible to export the preview movie with QuickTime Player?
The preview movie is actually a smil project. Apple’s smil renderer does not work well when when exporting smil projects. You should export to QuickTime reference movie with Annotation Edit instead. This movie can be rendered to any format supported by QuickTime. We use smil because it is fast, human readable, reusable and w3c standard. A smil project is added to version 1.2.