Why will burned video DVDs not mount and why are those DVD's wrongly seen as empty in 13.04?

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http://askubuntu.com – This happens with all self-made DVD's I have. Created those quite some time ago on Windows XP with Nero. My DVD player autostarts the DVDs. Windows 7 also plays/sees the files on the DVDs Commercial DVDs open normally, just as self-made data DVDs (old ones made with Gnomebaker), as do audio CDs and data CDs. Later I created these simple DVDs on Vista with Nero and later with Nero for Linux; probably Ubuntu 10 (I think). A few (illegal movies) and most DVDs are music bootlegs. The DVDs are named and have two folders that's all: [empty] AUDIO_TS and [containing files in] VIDEO_TS. Might this (HowTos)