QMl Camera returns "Camera is in use" if restarted

[Mesrine]

Hi everyone,

I am using qt6.7.0.
Using the camera QML type like

import QtQuick 2.0
import QtMultimedia

Item
{
    id:root
  
    function stop() {
        camera.stop();
        startcamera.visible=true;
        }

   
    Camera {
        id: camera
        active: false
        onErrorOccurred: (error,errorString)=> {
                             console.log(errorString)
                             console.log(error)
                         }

    }
    
    MyButton
    {
        id:startcamera
        anchors.centerIn: root
        text:qsTr("ScanQr")
        onClicked:
        {
            camera.start();
            startcamera.visible=false;
        }
    }
}

I see the webcam light turned on the first time the start function is called.
The webcam light turns off when calling the stop function.
But when calling start again the camera returns the error Camera is in use and the webcam light does not turn on.
I am using Ubuntu on a laptop with a webcam.

Any help on how to restart or rehuse the camera in a QML type will be much appreciated.

[MartinK1]

Hi,

I am facing the same issue using Pyside6 on Debian. I was hoping the problem would be fixed with QTBUG-114174 in 6.5.3 but the problem is still there. The problem also shows in Qt 6.6.0.
Restarting is working fine with the same webcam using Qt 5.15 and the old camera interface.

Best wishes,
Martin.

[Mesrine]

@MartinK1
This one is newer and should be resolved, I have not tried it.
https://bugreports.qt.io/browse/QTBUG-117735

[MartinK1]

@Mesrine Thanks a lot. That looks like a good candidate! I will give it a try as soon as 6.5.4 is out.