DVD Studio Pro 1.5: How to Specify a Track Thumbnail

A track's thumbnail area is the box on the track tile that sometimes contains a picture. Depending on the kind of asset assigned to the track, you can change the thumbnail image.

1 Select the track.
2 Choose Change Thumbnail from the Item menu.
3 Use the slider to navigate to the image you want, then click OK.

Only specific images (technically speaking, only the first I-frame in a Group of Pictures) can be selected.