DISCLAIMER this is purely experimentation
any recordings from a vcr source for a dvd creating an ISO is fine.
testing with PAL 720 576 4 x 3 as an export
i created to projects, an AVI (640 x 480 25 fps, 10 min)and an MP4 as sources (same). i inserted it into the timeline and that gave me the aspect prompt which i chose not to. nothing done at all, straight to the burn window chose DVD, next the DVD Burning window create ISO prompt, starts then 1 second later Error Encoding The Movie and finished.
i tried exporting as a magix movie again it failed within a second
any theories answers or guidance