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Re: [libcvd-members] video_play and video_play_bw not working correctly

From: Pablo Barrera
Subject: Re: [libcvd-members] video_play and video_play_bw not working correctly on macosx
Date: Thu, 21 Aug 2008 15:01:07 +0100

Don't worry for the delay. Anyway, Georg already submitted the changes :-)

On 21/08/2008, at 10:12:10, Tom Drummond wrote:


Don't worry about spamming - this is all helpful information.

Yes - I remember the glFlush() call is critical in osx - otherwise the gl calls just bank up without ever being applied!

It might take us a bit longer to respond to your (helpful) bug reports just at the moment because we're preparing for ISMAR 2008 (which we're hosting in Cambridge in 3 weeks).

As you can tell - we have only intermittently targetted osx as a platform and thus we haven't kept it up to date.

I've found just a few problems to compile the software on a mac (and none on a linux box). All those problems are solved with the changes I sent. Right now I have the current version of CVD working smoothly on my machine (or at least I think so).

Thank you for the library!


For the moment you will have to add the glFlush(). We'll add it to the cvs code in due course.



Pablo Barrera wrote:
Hi (again)
I am sorry to spam you so often, but I have some issues with video_play programs. When I execute those programs (video_play and video_play_bw) the window is not update correctly. It just keep the first frame until some event happens in X11. To fix this I just glFlush the display after glDrawPixels():
$ cvs diff progs/video_play*c
Index: progs/
RCS file: /cvsroot/libcvd/libcvd/progs/,v
retrieving revision 1.4
diff -r1.4
>             glFlush();
Index: progs/
RCS file: /cvsroot/libcvd/libcvd/progs/,v
retrieving revision 1.3
diff -r1.3
>             glFlush();
I hope this will help a little bit.
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Dr Tom Drummond                
Machine Intelligence Laboratory
Department of Engineering
University of Cambridge

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