Since just adding a new virtual isn't binary compatible add a new derivative type with a virtual member and connect it up through a virtual in the private class. [ChangeLog] Support for per-plane strides and data offsets in QVideoFrame. Task-number: QTBUG-38345 Change-Id: I1974c2b0b454d130e17971ce549031259d61f9cd Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>