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Thread: DVD Movie Plays fine But dd doesn't like it.

  1. #1
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    DVD Movie Plays fine But dd doesn't like it.

    I bought a DVD Movie (Dark Knight) and I want the iso on my computer. I can play the movie in vlc but when I run
    Code:
    # dd if=/dev/dvd of=/home/user/Desktop/Bat.iso
    dd: reading `/dev/dvd': Input/output error
    720352+0 records in
    720352+0 records out
    368820224 bytes (369 MB) copied, 77.214 s, 4.8 MB/s
    Since dd is a low-level operation, it makes no sense to me that the DVD plays but dd cannot simply read the 1s and 0s from the dvd.

  2. #2
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    Re: DVD Movie Plays fine But dd doesn't like it.

    That's a strange device for your dvd player. Mine is /dev/scd0. Use the same device as listed in fstab
    Code:
    cat /etc/fstab
    I can't remember if dd needs the device mounted or umounted, but you should try both ways. You can always try using Brasero; I'm pretty sure it can make iso's. I prefer using command line tools, but it may be easier to go with GUI app.

  3. #3
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    Re: DVD Movie Plays fine But dd doesn't like it.

    Quote Originally Posted by jbrown96 View Post
    That's a strange device for your dvd player. Mine is /dev/scd0. Use the same device as listed in fstab
    Code:
    cat /etc/fstab
    I can't remember if dd needs the device mounted or umounted, but you should try both ways. You can always try using Brasero; I'm pretty sure it can make iso's. I prefer using command line tools, but it may be easier to go with GUI app.
    That's the one I tried first. It stopped at the same place (369 MB)
    Also, brasero was the first method I tried. I have tried mounted and unmounted

  4. #4
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    Re: DVD Movie Plays fine But dd doesn't like it.

    If I remember correctly, that error comes up when you try to duplicate encrypted DVDs. They purposely "corrupt" the data so it cannot be easily copied to reduce piracy.

  5. #5
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    Re: DVD Movie Plays fine But dd doesn't like it.

    /dev/dvd and /dev/scd0 will be the exact same device, just under two different aliases.

    /dev/scd0 will be the actual device
    /dev/dvd is mapped to it because its detected that there is a dvd there.

  6. #6
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    Re: DVD Movie Plays fine But dd doesn't like it.

    Quote Originally Posted by Rolcol View Post
    If I remember correctly, that error comes up when you try to duplicate encrypted DVDs. They purposely "corrupt" the data so it cannot be easily copied to reduce piracy.
    This isn't true. dd makes a bit for bit copy, and encryption doesn't matter. While you won't be able to play the dvd unless you have some libraries to decrypt it, there won't be any problems making a copy.

    I don't really know what the problem is. What kind of filesystem are you using (if it's really strange, it might not support large files)? Could you try with another dvd? I'm sure you've tried this a few times; does it always fail at the same point?

  7. #7
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    Re: DVD Movie Plays fine But dd doesn't like it.

    Quote Originally Posted by jbrown96 View Post
    This isn't true. dd makes a bit for bit copy, and encryption doesn't matter. While you won't be able to play the dvd unless you have some libraries to decrypt it, there won't be any problems making a copy.

    I don't really know what the problem is. What kind of filesystem are you using (if it's really strange, it might not support large files)? Could you try with another dvd? I'm sure you've tried this a few times; does it always fail at the same point?
    Batman is a 2-Disc set.
    The special features (7.8 GB) copied fine, but the actual feature won't
    yeah it always fails at 369 MB
    Last edited by JohnGalt131; December 13th, 2008 at 11:24 PM.

  8. #8
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    Re: DVD Movie Plays fine But dd doesn't like it.

    perhaps there is a scratch or even a bit of dust that causes a read error(beyond the capacity of the error correcting code ot compensate for) which could cause dd to exit.

    i think there is something(dd_rescue maybe) that does the same thing as dd but will completely ignore read errors and continue on regardless that might be of use to you.

    the program is in the repositories.

  9. #9
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    Re: DVD Movie Plays fine But dd doesn't like it.

    I have attempted to copy the same movie. Both my xp system and ubuntu system will not copy this dvd. I not sure how to get around this but usaly I have very good luck with most dvds.

  10. #10
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    Re: DVD Movie Plays fine But dd doesn't like it.

    make sure libdvdcss2 is installed from the repos, and then there is a script included you have to run. this is already incorporated in vlc which is why it works. what you can also do is try and use handbrake. while it is command-line, it works for me every time when others would fail. Also, haven't tried this, but supposedly you can stream from vlc to file. My recommendation would be handbrake, but this might be appealing to some people.
    Windows free as of 11/18/2008.
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