[Linux-disciples] The loop device

[Adam Rosi-Kessel]

If the DVD was encrypted with CSS, I don't think you can save it with 
dd.  The encryption, I *believe*, is in the hardware, so you need to 
use something like dvdbackup to make an image of it.

Try running mplayer on the VOB files in video_ts and see what that does.

You might also be able to run mplayer right on the ISO file.

Stephen R Laniel wrote:
> Kind of relatedly: I copied a DVD to a disk image via
> 
> dd if=/dev/hdc of=image_file.iso
> 
> or something similar, where /dev/hdc is the DVD reader. I
> can now mount it via
> 
> sudo mount -o loop -t iso9660 image_file.iso /mnt/dvd/ 
> 
> and I get a proper directory listing:
> 
> (15:01) slaniel at TheloniousMonk:~$ ls /mnt/dvd
> total 10K
> dr-xr-xr-x    1 root     root         2.0K 2004-08-19 12:16 .
> drwxr-xr-x   10 root     root         4.0K 2005-01-03 14:28 ..
> dr-xr-xr-x    1 root     root         2.0K 2004-08-25 08:41 audio_ts
> dr-xr-xr-x    1 root     root         2.0K 2004-08-25 09:13 video_ts
> 
> (as an aside, I think the loop device must be doing some
> kind of magic, because the .iso file itself is only 202
> megs, but du'ing /mnt/dvd shows that it contains 7.7 gigs of
> files)
> 
> Now how do I play this DVD? I tried
> 
> mplayer dvd://1 -dvd-device ~/image_file.iso
> 
> and got
> 
> Playing dvd://1.
> Reading disc structure, please wait...
> There are 9 titles on this DVD.
> There are 14 chapters in this DVD title.
> There are 1 angles in this DVD title.
> libdvdread: Invalid title IFO (VTS_01_0.IFO).
> Cannot open the IFO file for DVD title 1.
> 
> I have libdvdcss2 installed:
> 
> libdvdcss2/unstable uptodate 1.2.8-0.0
> 
> Any idea what the problem could be? I get the sense that
> maybe the issue is the loop device, but I don't understand
> it well enough to know whether that's the problem.
> 


-- 
Adam Rosi-Kessel
http://adam.rosi-kessel.org
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