Using gstreamer with 2 different USB camera inputs and one .hef model

Hi,

we are already using Multi-Stream Inference with DeGirum PySDK. Unfortunately when trying to use it with two inputs (videofile or webcam) it does not start properly and very slow. It only shows one window, which is completely black. It crashes after a while as well. When using the threading with one of the inputs, it works fine at around 20-30FPS. Additionally this error appears, we are not sure if this is important. There are not other errors printed…
qt.qpa.plugin: Could not find the Qt platform plugin “wayland” in “/home/teamalpha/Dokumente/hailo_examples/degirum_env/lib/python3.9/site-packages/cv2/qt/plugins”

We are working on an RaspberryPi5. Any help would be appreciated.