Hi,
yep there are sometimes strange behavior when using multithreading. Currently
I am trying to solve them as far as I can. So that osgPPU can be used in
multithreaded/multicontext mode ;)
Afterwards, i think, it would be a good idea to speak with Robert about the
integration of osgPPU into osg ;)
Best regards,
Art
On Wednesday 27 August 2008 21:47:10 alexandre amyot murray wrote:
> Hi again,
>
> I added this line to my code and now I don't get the weird crash.
>
> viewer.setThreadingModel(osgViewer::Viewer::SingleThreaded);
>
> Don't know why, but it work :)
>
> Thank you for your help
>
> Alex
>
>
> Hi Alexandre,
>
> > Hi Art,
> >
> > yes, the rest of my setup is exactly like you said :
> >
> > osgPPU::Processor->addChild(videoUnitTexture);
> > videoUnitTexture->addChild(anotherUnit);
> > It works great if I load a simple image (.png) rather than
> > a video file (.mov).
>
> Hmm, and the processor is also added to the scene graph?
>
>
> I have uploaded a simple video example, which shows how to use osgPPU to
> perform some video processing. In the example the video is just modified
> during the rendering to show in greyscale mode. Other filters are of course
> possible. Take a look.
>
> > Also I checked if the video streaming works well when apply
> > to a model
> > in a scene and it does render correctly.
> >
> >
> > I tried another way with my own video streaming class that
> > look like this :
> >
> > ...
> >
> > osg::Texture2D* texture = new osg::Texture2D();
> > texture->setDataVariance( osg::object::DYNAMIC );
> >
> > osgPPU::UnitTexture * videoUnitTexture = new
> > osgPPU::UnitTexture( texture );
> >
> > ...
> >
> > while( !viewer.done() )
> > {
> > // Update the texture image in the main render loop
> > osg::Image* image =
> > myOwnStreamingClass->getNextFrameToDisplay();
> > texture->setImage( image );
> >
> > viewer.frame();
> > }
> >
> > This way it works fine for a while, but after a certain
> > time (random),
> > the application crash with an unhandle exception.
>
> I do not know, why the application crashes. Maybe some memory leaks in the
> image streaming class. Have you also tried your streamer without osgPPU.
>
> I would say get the newest version of osgPPU from the svn. Maybe the small
> changes I have made would help you to solve the problem.
>
>
> Sometimes there are also crashes or strange behaviour if using osg and
> osgPPU together. It happens if osgPPU tries to access textures which
> haven't applied through osg before. Such a texture has no valid properties,
> i.e. texture size, which makes the osgPPU do not handle in a proper way. I
> have tried to make the osgPPU's code more or less stable against such wrong
> usage, however this might still happen if osgPPU is used wrong.
> This problem is very hard solvable, because of this strict behaviour of osg
> to load and to initialize all the data after they had been applied. I hate
> this, it doesn't make my life easier at all ;(
> Hence try to use osgPPU as it has been shown in all the examples and you
> won't get any troubles.
>
>
> Best regards,
> Art
>
>
> P.S. If nothing helps, then provide me with the info output
> (OSG_NOTIFY_LEVEL=info), so that one can see the osgPPU's output
> information.
>
> > So I'm a little confuse with all this stuff, hope you
> > can help me.
> >
> > Thank you
> >
> > Alexandre
> >
> >
> >
> > Hi Alexandre,
> >
> > > Hi,
> > >
> > > I want to use osgPPU::UnitTexture to shoot a video as
> >
> > a texture input for
> >
> > > another unit.
> >
> > Ok, good idea, I have used it for my project successfully.
> >
> > > So I tried this code :
> > >
> > > Image * myVideo = osgDB::readImageFile(
> >
> > "myVideoFile.mov" );
> >
> > > osg::ImageStream * videoStream_ = NULL;
> > > videoStream_ = dynamic_cast<osg::ImageStream*>(
> >
> > myVideo );
> >
> > > videoStream_->setLoopingMode(
> >
> > osg::ImageStream::LOOPING );
> >
> > > if( videoStream_ )
> > > videoStream_->play();
> > >
> > > osg::Texture2D* texture = new osg::Texture2D();
> > > texture->setImage(myVideo);
> > >
> > > osgPPU::UnitTexture * videoUnitTexture = new
> >
> > osgPPU::UnitTexture( texture
> >
> > > );
> > >
> > > .... and then plug it in the unit pipeline
> >
> > How is the rest of your setup. It should be something like
> > this:
> >
> > osgPPU::Processor->addChild(videoUnitTexture);
> > videoUnitTexture->addChild(anotherUnit);
> >
> > > But this doesnt work, the texture input in my other
> >
> > module is always black.
> >
> > I'll try tomorrow a simple example and let you know if
> > you need some extra
> > setup. There were a lot of changes since the last use of
> > video processing
> > through osgPPU.
> >
> > > Is my code wrong ? If no, what is the way to do that
> >
> > with osgPPU
> >
> > Could you check if the video streaming do work at all? I
> > mean it could be that
> > the file is just not streamed properly. Try to set the
> > texture to some model in
> > the scene and see if the texture changes during the
> > rendering.
> >
> > > Is this the good place to post for osgPPU ?
> >
> > I think yes, if nobody complains ;). There is no extra
> > mailinglist for
> > osgPPU.
> >
> >
> > Best regards,
> > Art
> >
> > > Thank you
> > >
> > > Alexandre
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
