QAbstractVideoFilter removed in Qt6

[ascomycota]

Hello,

I am trying to port your lib to Qt6. I recognized some issues in CMake files (which I can fix) but I also encounter some severe issues e.g. that QAbstractVideoFilter is missing in Qt6. So the QML VideoOutput filters wont work anymore (they are also missing in QML 6).

Did you make any progress in this area? I don't want to do redundant things here. I also want to commit my changes someday to your trunk. Is that possible somehow?

Thanks
Andreas