2

I have this kind of info app that is supposed to show some info content. It's written in QT / QML. Qt version is 5.12.

It runs on Raspberry Pi 4 - Lite image, no X, OpenGLES. Now what if I wanted to add another monitor that would display the same content. Just imagine the screen faces a different direction so that more people can see it.

I could probably try messing around with some HDMI splitters, but since RPi4 has two HDMI outputs, the idea is to use the other one.

What would be the easiest solution? I doubt I can just duplicate the screen without X, right? So I would probably need to implement it in the QT itself. In theory, I should be able to create more instances of the Window and set a different screen argument, but that sounds rather complicated as I would have to synchronize between all the instances. Can I somehow just display the same window twice?

Thanks for any suggestions.

Jan

Improve this question
4
  • 1
    If you don't have lots of animations and/or are not interested in extremely high performance, you may consider using QScreen::grabWindow on the source at regular intervals (35-40ms), then just use QLabels to display the content on the other screens.
    – musicamante
    Commented Nov 30 at 19:04
  • I haven't used it but... on RPi5 there's a utility named raindrop. Not sure if it allows you to duplicate output but if anything does... –
    – G.M.
    Commented Nov 30 at 20:39
  • @musicamante That sounds like an interesting idea. There are some animations, but they're not really essential, so it might work. Thanks for the tip.
    – Aros
    Commented Dec 2 at 20:27
  • @Aros You're welcome. In any case, if you find a solution that fits your needs, please consider clicking the "Answer your question" button and provide an appropriate answer that explains what you did and, possibly, a related minimal reproducible example of your approach.
    – musicamante
    Commented Dec 3 at 4:03
Related questions
4
QQuickView - resize the content without delay / lag
1
Multiple modes in a Qt Quick QML Window?
0
QQuickWidget's content disappears when parent's parent changes
Load 2 more related questions Show fewer related questions

0

Reset to default

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.