Invoking dvdauthor with the following .xml control file fails to write the .BUP and .IFO files in the target directory. Subsequent applications, such as genisoimage, then fail due to a malformed dvd file structure. The other VTS...IFO and VTS...BUP and VTS...VOB files are written normally.
A workaround is available for this "bug" or one may consider it
to be a resolution to the problem.
The following environment variable is REQUIRED!!
VIDEO_FORMAT=NTSC
With that setting the proper VIDEO_TS.BUP and VIDEO_TS.IFO files
are created and subsequent genisoimage application is happy with
the DVD file structure.
The alternative PAL value might also work but has not been tested.