Last week I was finally able to create a DVD-Video with ffmpeg which played on both my parents Sony DVD and my own Sony DVD player without any problems whatsoever. My previous tries ended with DVD which showed either horrible green artifacts or severe synchronisation problems. With last weeks CVS tree, it works fine.
So, the create a DVD-Video the output of ffmpeg can be fed directly to dvdauthor, no de-re-multiplexing of MPEG streams is necessary. And what's even better, on my Athlon XP 2000+ system, its encoding is faster then real-time; encoding to DVD-Video compliant MPEG-2 only took 75% of the running time of the video.