QT multi-window application

kardanger · June 19, 2024, 6:00am

I’m working in a QT multi-window application and using qmlglsink. When using qmlglsink in one window, everything works, but if you run pipelines in different windows, streaming occurs only in the first one, and in the others there is a black screen. Is it possible to run pipelines in multiple windows in QT?

ystreet00 · June 19, 2024, 7:50am

Yes, it should be possible to run multiple qmlglsink elements in multiple windows. If you have a test case. If you have a reproducible test case, please share.

kardanger · June 21, 2024, 6:17pm

I created a mini qt project to run multiple pipelines in different windows. I was using Ubuntu

ystreet00 · June 24, 2024, 5:11am

Using the latest main of GStreamer with Qt 5.15.13. That example works just fine. What versions of GStreamer and Qt are you using?

kardanger · June 24, 2024, 5:55pm

I use Ubuntu 22.04.4 LTS with packages Gstreamer 1.20 and Qt 5.15.3.

ystreet00 · June 25, 2024, 2:31am

Ah, this may require a newer GStreamer version to work properly in this specific case. Trying against my distribution’s GStreamer 1.22.12, then this seems to fail. This may require GStreamer >= 1.24.3 to work properly.