ofBufferObject and async camera/video texture upload

hmm so to understand it right...the example ThreadedPixelBufferexample demonstrates how a texture (of the fbo) can be copied to another thread by the use of map and unmap of pibo.

However i dont understand why this stops working as soon as i draw the camera into the FBO like this

if (camera.isFrameNew()) {
	fbo.begin();
	ofClear(0, 255);
	ofSetColor(100);
	ofSetColor(255);
	camera.draw(0, 0);
	fbo.end();
}

when i do this it all stops working - is it because of the thing you mentioned with the video callback?

The thing is that i need to run the video input on a shader and then translate its fbo texture to this other thread doing quite expensive opencv stuff.

Is PBO the right choice here?

anyway any help would be nice!!

mio