How to use QAbstractVideoSurface in blocking mode?

Question

Qt

The task is as follows: using Qt, you need to process video frames, but the processing is quite specific and takes a lot of time (half a second per frame). The QAbstractVideoSurface class is great for solving such problems, but the problem is that by default the class (or, rather, the successor of the class) is used in non-blocking mode, therefore, the processing time is much less than necessary. Is there a way to use blocking mode for descendants of QAbstractVideoSurface?