A lot of questions for answers.

As far as I know, you cannot capture from a camera using Qt. Not directly anyway. And Phonon does not (yet) support that either. You'd need to pass through OpenCV (and DirectShow on Windows). I am guessing that you *could* use V4L2 directly through a pipe or something. But that would make it platform dependent as well as easily breakable.

But anyone knows a better way. I would love to hear about it too!