Michael Mol <[email protected]> wrote: > dvdbackup can recreate the ISO images, IIRC.
No, dvdbackup just creates a readable mirror copy from the directory tree on the DVD. You need to use mkisofs -dvd-video to create a new ISO image that can be written to DVD. > If you run a simple 'dd' on a DVD with encrypted portions, you'll get > I/O errors when it encounters the encrypted pieces. IIRC, some of the This is what I mentioned on the cdrecord mailing list already... > IIRC, dvdbackup makes use of libdvdcss to decrypt the encrypted > portions[1], and writes a decrypted version of the data. *this* is why > you can't make a bit-for-bit copy; the output data would be decrypted. dvdbackup decrypts the sectors that are part of the VOB files. > There are other, later obstacles, too; once CSS was broken, some > content publishers (Bandai USA, for example) would fudge the ISO spec > and the DVD nav specs in ways that didn't break *most* hardware DVD > players, but did tend to break players which strictly adhered to the > standards, such as ffmpeg, vlc and mplayer. It also broke dvdbackup This is interestingas some mkisofs users report that there are DVDs that look as if there is a need to introduce negative padding between some files. Jörg -- EMail:[email protected] (home) Jörg Schilling D-13353 Berlin [email protected] (uni) [email protected] (work) Blog: http://schily.blogspot.com/ URL: http://cdrecord.berlios.de/private/ ftp://ftp.berlios.de/pub/schily
