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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