To render a DVD from your Aperture Slideshow export the Slideshow to the Finder as HD movie; then create a new project in iDVD and then import this movie into iDVD.
To render a movie from your Slideshow in Aperture press the "Export" button in the upper right corner, and then select the quality settings and a filename in the export panel.
Probably because of the DVD resolution limitations, Apple seems to be moving away from DVD's. However, if you simply export your slideshow as a DV file, you can import it into iDVD.
This might help, too:
How do I proceed exactly to "export to the Finder as HD movie (dixit leonieDF) and to "export as a DV file" (your advise), since the 'Export' button in the upper right corner only mentions "Export for: Custom / iPod / iPhone / iPod Touch / MobileMe / You Tube / Apple TV / iPad / HD 720p or 1080p"? No mention of "DV". What do I overlook?
In what does your advise differ from the suggestion by leonieDF "to export to the Finder as HD movie"? And, concerning the quality in "Custom": what is the difference between "Best" and "High" and which is to prefer?
The slideshow of 7 minutes contains 91 items of images, scanned from original slides. No image is larger than 4 MB.
Have a look at the iDVD Help text: It lists the following compatible video formats:
HD 720 or HD 1080 are both variants of HDV (HIgh Definition Video) can both be used with iDVD.
You can use these movie and graphic formats in iDVD:■ Most video or image files supported by QuickTime (see the list of unsupported QuickTime formats below)■ 16:9 widescreen formats■ AAC, MP3, and AIFF audio files■ Any format from iMovie: DV, high-definition video (HDV), MPEG-2 SD, MPEG-2 SD, MPEG-4 SD, MPEG-4 HD, and AVCHD
High definition video is converted to work with the format of your project. iDVD supports using 16:9 widescreen video; therefore, when your DVD plays on a DVD player that supports widescreen format, the footage appears in its original aspect ratio.
The following video and image formats are not supported in iDVD:■ Copyrighted or protected videos.■ Movies saved in thousands of colors using the “none” compression setting in iMovie.■ 48-bit color images (16 bits per color). To use source files in one of these formats in iDVD, save them in a supported format.■ Aurora uncompressed files. For best results, export Aurora clips as DV-format video before importing them into iDVD.■ QuickTime VR, MPEG-1 or MPEG-2, Flash, streaming or encrypted movies, or QuickTime spanned movies. You can’t add MPEG-1 or MPEG-2 files to an iDVD project because they don’t contain standard video tracks.■ QuickTime Fast Start movies. (Fast Start movies are intended for Internet playback.) When saving a QuickTime movie for use with iDVD, click the Options button in the QuickTime Export dialog and make sure that the “Prepare for Internet Streaming” checkbox is not selected.