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Have you checked the disc for scratches, etc...

Also, have you checked the connection between your Mac and DVD drive...

Apple DVD player will be more forgiving of read errors from the disc than
DVDibbler. The last few lines of the output indicate to me that there is a problem
reading from either the drive or the disc (get_buffer failed... Bus error...), does
not look like a bug with DVDibbler and I have not seen it happen before.

Kind regards,

Kris J Tooke