QCamera - gstreamer - instable, not working, not streaming

QCamera:

1. does not stream on Ubuntu 22.04. Both the Qt included example and the sample added to this ticket don´t work. The stream freezes very quickly.
2. Crashes very easily with a sigsegv on the same platform. 
   • This is when multiple camera devices are connected.
   • When an other device is selected, is crashes even X11. 

The adviced gstreamer plugins are all installed on the system.

• The "Cheese" program of ubuntu has similar problems: the stream freezes.
• The "Webcamoid" program of ubuntu does a good job. It switches between the devices and streams them both. 
• The "Camera" program of ubuntu has the same freeze problems (i.e. pinhole). 
• "MS Teams" for linux has no problems. 
• "Zoom" for linux has no problems. 
• "guvcview" also has no problems.