Why is Screen Grab crippled during DVD playback?

Discussion in 'Apps' started by Roger, Mar 31, 2007.

  1. Roger

    Roger Guest

    Anyone know?

    Thanks,
    Rog
     
    Roger, Mar 31, 2007
    #1
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  2. Roger

    Shawn Hirn Guest

    In article <>,
    Roger <> wrote:

    > Anyone know?


    Perhaps because the recording industry doesn't want you to.
     
    Shawn Hirn, Mar 31, 2007
    #2
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  3. Roger

    Roger Guest

    In article <1hvsusx.1qtbimb1hloi0mN%0m>,
    0m (Paul Mitchum) wrote:

    > Roger <> wrote:
    >
    > > Anyone know?

    >
    > One of the technical reasons floated is that DVD playpack uses the
    > screen memory in a different way.
    >
    > Another less-technical reason is probably that movies are copyrighted
    > material.
    >
    > The solution: Use VLC to play back the DVD if you need a screen grab.
    > Legally-sanctioned screen grabs only, of course.
    > <http://www.videolan.org/vlc/>


    Has Apple pre-determined all DVD screengrabs are legally unsanctionable?
    What about DVD material I own, for example? I hope it's the technical
    reason, although things like SnapNDrag have no problem. Thanks for the
    VLC tip.

    Rog
     
    Roger, Mar 31, 2007
    #3
  4. Roger

    dorayme Guest

    In article <1hvsusx.1qtbimb1hloi0mN%0m>,
    0m (Paul Mitchum) wrote:

    > The solution: Use VLC to play back the DVD if you need a screen grab.
    > Legally-sanctioned screen grabs only, of course.


    Like that moment in Witness when the thug puts a dob of ice-cream
    from his cone on one of the Amish. He is about to get a broken
    nose from Harrison Ford.

    --
    dorayme
     
    dorayme, Mar 31, 2007
    #4
  5. Roger

    magdalena Guest

    In article <>,
    Roger <> wrote:

    > Anyone know?
    >
    > Thanks,
    > Rog


    Maybe cause it's in motion? WHo knows? Can't you pause the DVD and make
    your screen grab while it's static?
     
    magdalena, Mar 31, 2007
    #5
  6. Sebastian Lewis, Mar 31, 2007
    #6
  7. Roger

    Warren Oates Guest

    Warren Oates, Mar 31, 2007
    #7
  8. Roger

    Greg Buchner Guest

    In article <>,
    "Sebastian Lewis" <> wrote:

    > On Mar 30, 5:21 pm, Roger <> wrote:
    > > Anyone know?
    > >
    > > Thanks,
    > > Rog

    >
    > It's required by the MPAA (damn I think that's correct, for some
    > strange reason that looks wrong though) for all "Software" DVD
    > players.


    Then just start using MAFIAA - Music and Film Industry Associations of
    America. Easier to remember. At least for me...

    :-D

    Greg B.

    --
    Actual e-mail address is gregbuchner and I'm located at gmail.com
     
    Greg Buchner, Mar 31, 2007
    #8
  9. Roger

    Roger Guest

    In article <>,
    "Sebastian Lewis" <> wrote:

    > On Mar 30, 5:21 pm, Roger <> wrote:
    > > Anyone know?
    > >
    > > Thanks,
    > > Rog

    >
    > It's required by the MPAA (damn I think that's correct, for some
    > strange reason that looks wrong though) for all "Software" DVD
    > players. I just read this article a few hours ago.
    > http://www.roughlydrafted.com/RD/RDM.Tech.Q1.07/6FFE4614-E1AB-45C7-8611-19D06E
    > CCAD9F.html


    Interesting; thanks for the info. It's nice to know it's not Apple
    themselves--I thought it seemed very un-Apple-like. Looks like the MPAA
    has a heck of a lot of lobbying clout. I guess they think it's a given
    their movies are more important than mine when it comes to my computer
    dollars.

    Rog
     
    Roger, Mar 31, 2007
    #9
  10. Roger

    Roger Guest

    In article
    <>,
    dorayme <> wrote:

    > In article <1hvsusx.1qtbimb1hloi0mN%0m>,
    > 0m (Paul Mitchum) wrote:
    >
    > > The solution: Use VLC to play back the DVD if you need a screen grab.
    > > Legally-sanctioned screen grabs only, of course.

    >
    > Like that moment in Witness when the thug puts a dob of ice-cream
    > from his cone on one of the Amish. He is about to get a broken
    > nose from Harrison Ford.


    Not familiar with that film; can you post a screenshot?

    Rog
    :)
     
    Roger, Mar 31, 2007
    #10
  11. Roger

    Warren Oates Guest

    In article <>,
    Roger <> wrote:

    > Interesting; thanks for the info. It's nice to know it's not Apple
    > themselves--I thought it seemed very un-Apple-like. Looks like the MPAA
    > has a heck of a lot of lobbying clout. I guess they think it's a given
    > their movies are more important than mine when it comes to my computer
    > dollars.


    It's a given that they're nuts. If you take a look at their website,
    they're doing a "killer weed" scare, where anyone who downloads a DivX
    of a picture is also a crack-cocaine-addicted child molester.
    --
    W. Oates
     
    Warren Oates, Mar 31, 2007
    #11
  12. In article <>, Roger
    <> wrote:

    > Has Apple pre-determined all DVD screengrabs are legally unsanctionable?


    No, the DVD Forum has.

    If you want to write software that plays DVDs, you need a CSS key
    issued by the DVD Forum. If you want a CSS key, you have to agree to
    the DVD Forum's terms and conditions. One of these is that screen
    captures of DVDs are forbidden. If Apple were to break their contract,
    their CSS key could be revoked and future DVDs would no longer play on
    their player.

    At the time this condition was introduced, they were seriously afraid
    that people would pirate DVDs by advancing through them a screen at a
    time and capturing each frame. (Not something you're likely to do
    manually, but it could be automated.) Kind of a moot point now with
    DeCSS, of course, but the contract's still the same.

    VLC gets around this by not having their own CSS key but rather using
    DeCSS, so their key won't be revoked.

    Of course, Apple can't prevent other screen capture software from
    capturing DVDs anymore. It used to be that the DVD video was decoded
    in hardware and overlaid onto the computer's video, and screen captures
    would grab a blank square because the DVD video wasn't actually in the
    VRAM accessible by the CPU. But now that the decoding is in software,
    that trick doesn't work.

    --
    Jerry Kindall, Seattle, WA <http://www.jerrykindall.com/>

    Send only plain text messages under 32K to the Reply-To address.
    This mailbox is filtered aggressively to thwart spam and viruses.
     
    Jerry Kindall, Mar 31, 2007
    #12
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