Re: DVD playback format?
Re: DVD playback format?
- Subject: Re: DVD playback format?
- From: Wade Tregaskis <email@hidden>
- Date: Thu, 30 Oct 2003 09:57:49 +1100
I'm learning on how to take a screen shot using Cocoa, but I've
noticed that many screen capture applications cannot capture a DVD
window playing, yet it can grab the rest of the screen just fine.
What is the difference between DVD playback and the rest of the screen
(whether it be just the background, or even some other movie file,
such as an .avi or .asf playing)?
I believe DVD playback (in hardware) is pink-screened; DVD player puts
up a window of the right colour, and the DVD image is composited onto
this by the graphics card. Consequently, the DVD image is never in
main memory, and so cannot be captured using traditional methods.
There are several reasons for this, not the least of which being the
performance advantage of not having to move huge amounts of data to and
from memory, but I believe Apple were also rather happy with the
security this brought.
You might be able to work around this using a software-only version of
the DVD player, although whether such a version was ever released for
OS X I don't know. Alternatively, use a different DVD playing app,
like VLC, which does software decoding.
Wade Tregaskis
-- Sed quis custodiet ipsos custodes?
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