OpenCV and ffmpeg
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Hi,
To use them with Qt is not specially hard however there has been an announcement for the "Qt Media Encoder Library" that uses both. You might be interested.
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SGaist, thanks for the advertisement :)
grastvei, here is a topic about that library - http://qt-project.org/forums/viewthread/29117/
If you you need any support I will be glad to help you.