[Interest] What's the best of way of making a video processing pipeline in Qt?

[David M. Cotter]

Assuming you want multiple layers, you want a QGraphicsScene
https://doc.qt.io/qt-6/qgraphicsscene.html

Shown through a view

And into the scene you can add QGraphicsItems
https://doc.qt.io/qt-6/qgraphicsitem.html#details

One of which can be a pixmap item:
https://doc.qt.io/qt-6/qgraphicspixmapitem.html

yes?

> On Aug 15, 2024, at 1:37 AM, Nuno Santos via Interest <interest at qt-project.org> wrote:
> 
> Hi,
> 
> I’m looking to create a pipeline of video processing with C++ only.
> 
> I want for instance to create render a video, then an apply a blur effect, followed by a tilt effect, followed by hue shift effect, and so on. 
> 
> I also want to be able to switch the order of the effects.
> 
> I know this is possible to make using Qml but I want to have more low level and dynamic control and be able to do this from C++. Is this even possible using Qt only?
> 
> I believe a single QQuickItem is able to render source but in order to process is I need to be able to pass the output of that quick item to another quick item which will apply the effect on it.
> 
> This was the strategy used in a higher level from the Qml side using the multi effect source. Isn’t that correct? But is this possible to do with Qt 6 and C++ only? Is there any API I should be aware of?
> 
> Please advise.
> 
> Thanks in advance.
> 
> With my best regards,
> 
> Nuno
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