In iDVD 5, the DVD Capacity meter (in the Customize drawer, click the Status tab) reports the project size differently than in earlier versions of iDVD. When you add media assets to an iDVD 5 project (such as video, slideshows, and audio), the DVD Capacity meter updates to show the size of your project; you can have the meter indicate the current running time (the total time for all media and transitions) or the total disc space used. To switch the display between minutes and gigabytes (GB), click the text to the right of the DVD Capacity meter.
In earlier versions of iDVD, the meter did not necessarily indicate the actual running time for some elements, such as slideshows. In iDVD 5, this meter reports the actual running time of slideshows—not their video capacity equivalent. To determine how much space is available on your DVD after adding assets to the project, view the gigabyte display—not the time display. For more information on the iDVD Status pane, click here.