| 1 |
Michael Mol <mikemol@×××××.com> wrote: |
| 2 |
|
| 3 |
> dvdbackup can recreate the ISO images, IIRC. |
| 4 |
|
| 5 |
No, dvdbackup just creates a readable mirror copy from the directory tree on |
| 6 |
the DVD. You need to use mkisofs -dvd-video to create a new ISO image that can |
| 7 |
be written to DVD. |
| 8 |
|
| 9 |
> If you run a simple 'dd' on a DVD with encrypted portions, you'll get |
| 10 |
> I/O errors when it encounters the encrypted pieces. IIRC, some of the |
| 11 |
|
| 12 |
This is what I mentioned on the cdrecord mailing list already... |
| 13 |
|
| 14 |
> IIRC, dvdbackup makes use of libdvdcss to decrypt the encrypted |
| 15 |
> portions[1], and writes a decrypted version of the data. *this* is why |
| 16 |
> you can't make a bit-for-bit copy; the output data would be decrypted. |
| 17 |
|
| 18 |
dvdbackup decrypts the sectors that are part of the VOB files. |
| 19 |
|
| 20 |
> There are other, later obstacles, too; once CSS was broken, some |
| 21 |
> content publishers (Bandai USA, for example) would fudge the ISO spec |
| 22 |
> and the DVD nav specs in ways that didn't break *most* hardware DVD |
| 23 |
> players, but did tend to break players which strictly adhered to the |
| 24 |
> standards, such as ffmpeg, vlc and mplayer. It also broke dvdbackup |
| 25 |
|
| 26 |
This is interestingas some mkisofs users report that there are DVDs that look |
| 27 |
as if there is a need to introduce negative padding between some files. |
| 28 |
|
| 29 |
Jörg |
| 30 |
|
| 31 |
-- |
| 32 |
EMail:joerg@××××××××××××××××××××××××.de (home) Jörg Schilling D-13353 Berlin |
| 33 |
js@××××××××××××.de (uni) |
| 34 |
joerg.schilling@××××××××××××××××.de (work) Blog: http://schily.blogspot.com/ |
| 35 |
URL: http://cdrecord.berlios.de/private/ ftp://ftp.berlios.de/pub/schily |
Archives