2c. using (passing) a Camera element as sourceObj, what will happen? It will also work.
That was in theory. In practice, it depends on the platform. QVideoProbe is not available on all of them (or only for either a media player or a camera). It should be in the doc, but here's an overview of QVideoProbe support: Android: only for camera Blackberry: no support iOS: no support Linux: only for media player Mac: no support Windows: only for media player If it's not supported it doesn't necessarily mean it's not possible to do it on a given platform, it can mean that it's not currently implemented. Yoann Lopes Senior Software Engineer - Digia, Qt Visit us on: http://qt.digia.com
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