I usually put my avi files on a cd-r converting them to vcds using nero. How do I do the same using a dvd-r for more storage space using nero still?
Nero won't do it. If you just want to put VCD's on a DVD, you can burn them as data for storage. If you want to play them on a standalone, they need to be authored. The only program I know that will author VCD's to DVD without re-encoding everything is DVDLab.