you run the programe more than once?
if you jioned the avi files then you will have you one files in the format you asked for?
dvd_0 & a dvd_01 folders are the out put folders
if you run the programe again with out deleting the out put folder that was made you would have another folder dvd_02 and so on ect ect
I use nero vision express 3, it lets you add multiple avi files, converts them to dvd files (vob), save the files to hdd,then if you need to reduce the size you can use "dvd shrink", if not, just burn.
you can also add chapters and a disc menu if you want