Re: DVDPlayback
Re: DVDPlayback
- Subject: Re: DVDPlayback
- From: Devin Lane <email@hidden>
- Date: Thu, 13 Jul 2006 06:45:33 -0400
Michael:
Oops, somehow I missed your reply when I made a new post.
Looking at DVDPlayer's nib files, it's viewer window has an HIView
that the video content is drawn into, meaning that there has to be
some way of drawing the video to somewhere else but a window, or some
magic that can be done with HIView.
The reason I want the video frames is not because I have an interest
in making a dvd ripping program, but because I wish to draw the video
in a custom view that supports arbitrary zooming, scrolling, and core
image effects. I cannot do that by just drawing the dvd video in a
window.
Any idea what Apple's player uses to get the frames directly?
Thanks,
On Jul 8, 2006, at 11:50 AM, Michael Ash wrote:
On 7/6/06, email@hidden <email@hidden> wrote:
cocoa-dev:
While the CocoaDVDPlayer sample works fine for basic playback of
a dvd or
VIDEO_TS folder, it isn't very helpful when trying to go a little
further.
Specifically, I need to be able to have DVDKit draw the video into a
gworld or other offscreen buffer so that I can draw it in a view
in my
application's window, allowing the window to contain other content.
There's a DVDSetVideoPort(), which I thought I would be able to
pass a
gworld too, but it looks like it needs a display device id as
well, as
though it's trying to force the dvd content to be drawn only in an
onscreen window. Also, since I can't debug the app (quits with
error 45
when run with gdb, I assume this means "licensing prevents
debugging of
dvd apps"), it makes it hard to figure out what's going on.
Furthermore, I'd also like to have more access to the actual
video, such
as to find the number of samples (frame), and the locations of
keyframes.
I'd be surprised if you could make this work in any simple manner.
DVDs contain a whole lot of DRM meant to prevent copying. This means
that (legal) DVD playback applications do various tricks to cooperate
with this DRM. For example, last I checked, DVDPlayer.app's video
content did not appear in screenshots taken with the built-in
screenshot mechanism. It is of course possible to get around this and
take a screenshot anyway, but you have to get into dirty tricks.
What you're describing is almost exactly what you would need to write
a very easy DVD ripper. (I'm not saying that *is* what you're writing,
but what you want to do and what you would need to do for that are
almost identical.) It follows that the DVDPlayback framework won't
easily allow you to render the video to any location where you could
get the pixel data back out.
If you want to include other controls in the playback window, I
suggest looking into putting the playback into a child window, with
the parent window containing the controls.
Mike
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