[osg-users] Strange behavior with multiple screens and ImageStream

Serge Lages serge.lages at gmail.com
Thu Sep 11 10:40:13 PDT 2008

Hi Ryan,

Thanks for the tip but it doesn't change anything for me... :/
The solution will be to not display the video in full resolution on the 2
screens for the moment.

On Thu, Sep 11, 2008 at 4:18 PM, Kawicki, Ryan H
<Ryan.H.Kawicki at boeing.com>wrote:

>  I am not an expert in this area, but our application seems to suffer from
> this as well.  I don't think this has to do with OSG.  I believe it to be
> more driver related.
> Do you have VSync turned on?  If you do, force VSync to be always off and
> retest.
> *Ryan H. Kawicki*
> The Boeing Company
> Training Systems & Services
> Software Engineer
>  ------------------------------
> *From:* Serge Lages [mailto:serge.lages at gmail.com]
> *Sent:* Thursday, September 11, 2008 4:53 AM
> *To:* OpenSceneGraph Users
> *Subject:* [osg-users] Strange behavior with multiple screens and
> ImageStream
>  Hi all,
> We've made an ImageStream using FFmpeg to display movies on textures, but I
> am currently facing some problem when displaying this movie on two different
> contexts. Here is my setup :
> WinXP with one GForce 8600GTS and 2 screens, viewer on DrawThreadPerContext
> mode (OSG SVN head version).
> When I only have one screen but two windows (with a different context per
> window), everything works fine, the movie is displayed on the 2 windows
> without any problem. When I plug a second screen, and I keep the same setup
> (2 windows rendered into the first screen), I have a huge frame drop (more
> than 20 fps) when rendering my movie (note that in this configuration,
> nothing is displayed on the second screen). Same thing happens if I use the
> 2 screens (with each window in full screen mode on each screen).
> I really don't understand why adding a new screens make this difference,
> moreover it's the only thing in my application that suffer like that from
> the second screen. Does it ring a bell to someone ?
> Thanks in advance !
> --
> Serge Lages
> http://www.tharsis-software.com
> _______________________________________________
> osg-users mailing list
> osg-users at lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org

Serge Lages
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