Input/output error when trying to copy DVD contents with DD

jonrpick · #1 3rd March 2010, 10:16 PM

Here's what I'm getting... I even threw some video DVDs at it to make sure it wasn't the disc.

Code:

[pickens@acer1 Videos]$ dd if=/dev/sr0 of=POTC.iso
dd: reading `/dev/sr0': Input/output error
5088+0 records in
5088+0 records out
2605056 bytes (2.6 MB) copied, 1.67727 s, 1.6 MB/s
[pickens@acer1 Videos]$

I am getting the same thing on my laptop running Mandriva, oddly enough. Two different drives, two different computers, two different distros and multiple DVDs.

What could be the problem??

Nokia · #2 3rd March 2010, 10:34 PM

DRM protected disc ?

jonrpick · #3 3rd March 2010, 10:42 PM

Quote:

Originally Posted by Nokia

DRM protected disc ?

I'd say so, yeah... I've never had a problem doing this in the past.

But VLC won't even play it, so...doesn't it usually play ANYTHING?

Also, I've never know DD to care one way or another about DRM...

stoat · #4 3rd March 2010, 10:45 PM

Hello jonrpick,

I was trying it myself while Nokia posted. I agree with Nokia. Are you copying encrypted disks? Because it's not the command. Here is a Windows XP CD...

Code:

[boo@localhost ~]$ dd if=/dev/sr0 of=disk.iso
1140692+0 records in
1140692+0 records out
584034304 bytes (584 MB) copied, 129.901 s, 4.5 MB/s

Then I tried a Fedora 11 DVD...

Code:

[boo@localhost ~]$ dd if=/dev/sr0 of=disk.iso
7195008+0 records in
7195008+0 records out
3683844096 bytes (3.7 GB) copied, 250.28 s, 14.7 MB/s

Then I tried a commercial movie DVD...

Code:

[boo@localhost ~]$ dd if=/dev/sr0 of=disk.iso
dd: reading `/dev/sr0': Input/output error
3296+0 records in
3296+0 records out
1687552 bytes (1.7 MB) copied, 0.620144 s, 2.7 MB/s

jonrpick · #5 3rd March 2010, 10:53 PM

Quote:

Originally Posted by stoat

Hello jonrpick,

I was trying it myself while Nokia posted. I agree with Nokia. Are you copying encrypted disks? Because it's not the command. Here is a Windows XP CD...

Code:

[boo@localhost ~]$ dd if=/dev/sr0 of=disk.iso
1140692+0 records in
1140692+0 records out
584034304 bytes (584 MB) copied, 129.901 s, 4.5 MB/s

Then I tried a Fedora 11 DVD...

Code:

[boo@localhost ~]$ dd if=/dev/sr0 of=disk.iso
7195008+0 records in
7195008+0 records out
3683844096 bytes (3.7 GB) copied, 250.28 s, 14.7 MB/s

Then I tried a commercial movie DVD...

Code:

[boo@localhost ~]$ dd if=/dev/sr0 of=disk.iso
dd: reading `/dev/sr0': Input/output error
3296+0 records in
3296+0 records out
1687552 bytes (1.7 MB) copied, 0.620144 s, 2.7 MB/s

Interesting... Is this something that's new that's being implemented? I can honestly only remember doing it once, like 2 years ago, and I did so with no problems whatsoever.

But why would VLC refuse to play it? I thought it played anything...

Nokia · #6 3rd March 2010, 11:01 PM

Anything, not DRM protected. Use this utility http://www.easylifeproject.org and install the following categories:
Codecs
MediaPlayers
DvdTools

BugRocks1 · #7 4th March 2010, 03:11 AM

VLC does play encrypted DVDs if you install Libdvdcss, libnav and some other stuff.

To do so you need to enable the livna repository.

su -c "rpm -Uvh http://rpm.livna.org/livna-release.rpm"

http://en.wikipedia.org/wiki/Libdvdcss

jpollard · #8 4th March 2010, 04:11 AM

If the DVD is audio/video then there are some other characteristics...

Audio in particular doesn't use a stream.. Each audio track is a partition, and
the track does not have to end on a block boundary. Even though 2048 byte records
(as I remember) is used, the 2 second silence does not have to be part of the data,
and the last block may be short.

Video data does use a filesystem, and is more likely to be sane as far as the
dd utility goes, but you do have to remember that the record sizes are not the
usual.

You can try allocating larger buffers (dd bs=xxx if=whatever of=whatever).
The default buffer size is 512 bytes (as per manpage) but this is very inefficient
for data - try a couple of MB instead (dd bs=2M ...) see if that makes a difference.

Another thing that can effect the output is whether the CD is "finished". Some audio
disks have a dangling pointer where the list of tracks is kept - This doesn't cause
a problem when playing (the players ignore it), but doing a dd will assume that there
is data there... and report an I/O error if it is missing.

smr54 · #9 4th March 2010, 05:00 AM

vobcopy and dvdbackup seem to work fairly well with DRM encrypted things.

***Dan*** · #10 4th March 2010, 11:44 PM

Folks, we're creeping up into copyright violation stuff here, so I'm closing the thread. Please note that PMs between members are not so restricted.

Thread closed.