QML Camera: Loading QQmlApplication has large delay
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I'm trying to show a video live stream from a USB device in my Qt5.12 QML interface on Ubuntu 18.04. The device is either a Webcam or a HDMI capture device (connected by USB). Following the examples, I added a QML Camera in my QML code. However, loading QQmlApplicationEngine in my main.cpp is now extremely slow (around 5 minutes until the UI starts). As soon as it is running, everything works as expected. I'm running it on a more than powerful workstation.
This is all I'm doing:
VideoOutput { source: camera anchors.fill: parent Camera { id: camera } }
Does anyone know why this is so slow? Or is there a better solution to show a live stream from an USB device?
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I was hoping that I can at least show the rest of the GUI using a Loader. This does not solve the initial problem with the delay, of course. But although the ApplicationWindow opens immediately now, nothing is shown inside until Camera is loaded (ApplicationWindow->StackLayout->...->Loader). I don't understand why Camera and Loader are not working as expected. Nobody seems to have this problems. I also checked the GStreamer version, which is 1.0.
Loader { id: loader asynchronous: true anchors.fill: parent sourceComponent: Item { anchors.fill: parent Camera { id: camera } VideoOutput { source: camera anchors.fill: parent } } }