To select the video format for an iDVD project:
Choose Project > Project Info.
Choose NTSC or PAL from the Video Mode pop-up menu and click OK.
iDVD can create DVDs with video that is in either NTSC or PAL format. NTSC format (with a frame rate of 29.97 frames per second) is used in North America, Japan, and some other non-European countries. PAL format (25 frames per second) is used in most European countries.
iDVD encodes the entire project in the format you have selected in iDVD, regardless of the video format of your footage (except when you burn a OneStep DVD from your camcorder, in which case iDVD automatically encodes the project in the format of your footage). This means you can have video in PAL format that iDVD encodes in NTSC format, and vice versa. When you have conflicting project and video formats, iDVD warns you before burning because sometimes encoding PAL video in NTSC format causes visual distortions. You cannot create a disc that includes video in both formats.
By default, iDVD is set to the correct format for your country.
Choose Project > Project Info.
Choose NTSC or PAL from the Video Mode pop-up menu and click OK.
You can use these steps to change the format of a project while you are working on it. If the project is being encoded in the background, however, some files will have to be reencoded. When you switch formats, a warning dialog prompts you that already encoded assets will be erased if you continue with the switch. If you click OK, the previously encoded assets are automatically erased and background encoding reencodes all files in the new format.