How to get video preview from QProcess to fill a rectangle in qml

Kachoraza

Hi!
I have a c++ class, where I am initiating QProcess in detached mode. This process launches a python script to get raspberry pi camera preview.
How can I get that preview and show it in a rectangle element?
The c++ function is a void type. Should it be some other type? You can make a QString function to return a QString, but there is no QProcess type.
I would appreciate any help. Thanks

Pablo J. Rogina

@Kachoraza you should provide more details about your runtime environment, i.e.
is the python script running on the RPi device, or is just connecting remotely?

Kachoraza

the python script is running on the pi.yes the python script is running on the pi locally.

Pablo J. Rogina

@Kachoraza and what about the Qt application using QProcess?

Kachoraza

it is also running locally on the pi

Pablo J. Rogina

@Kachoraza so what about driving the Pi camera directly from your QML app? just for instance this guide

Kachoraza

thanks. I will check it

Kachoraza

I tried to access the camera through Camera element and VideoOutput element. Camera status is 2, which I cannot understand.
Camera {
id: mycamera

    Component.onCompleted: {
        console.log(cameraStatus);
        mycamera.start()
        console.log(cameraStatus);
    }

}

I tried it on pi and on ubuntu as well

Kachoraza

@Pablo-J-Rogina I am trying to get camera preview with the following code, but all I have is a white window. Can you please see what am I doing wrong here. I have tried it on pi and ubuntu with no errors, but similar result. Thanks in advance
import QtQuick 2.9
import QtQuick.Window 2.3
import QtMultimedia 5.9
import QtQuick.Controls 2.2

Window {
id: window
width: 640
height: 480
property alias window: window
property alias videooutput: videooutput
visible: true
property Camera camera: Camera {
id: camera
captureMode: Camera.CaptureViewfinder
cameraState: Camera.ActiveState
Component.onCompleted: {
camera.start()
if(cameraState === Camera.ActiveState){
console.log("Camera ready")
}
}
}
VideoOutput {
id: videooutput
anchors.fill: parent
source: camera
focus: visible
enabled: true
Component.onCompleted: {
console.log(camera.cameraState)
}
}
}