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Details

Type: Bug
Resolution: Done
Priority: P2: Important
Fix Version/s: 6.2.0, 6.2.1, 6.3.0 Alpha, 6.2
Affects Version/s: 6.2.0 RC
Component/s: Multimedia
Labels:
None

Platform/s:

All
Commits:
31fa752209c4a6dfbd0aa7874350fd0ba37f8623 (qt/qtmultimedia/dev) 255e8cde23ae609f5109cb3caff639fbbae23334 (qt/qtmultimedia/6.2) 0df6cc0151a6c6dc564b2cee2bcf34182baa5243 (qt/qtmultimedia/6.2.0)

Description

In Qt5, the imageCaptured signal was embedded a URL as in the preview parameter. In Qt6, this parameter is now a QVariant(QImage).

While this can be useful, it breaks the usage of the preview parameter as a Image.source. The documentation still states that it can be used as such though.

qml: QVariant(QImage, QImage(QSize(1280, 720),format=QImage::Format_RGB32,depth=32,devicePixelRatio=1,bytesPerLine=5120,sizeInBytes=3686400)) Error: Cannot assign QImage to QUrl

Questions:

Is this expected?
Is there another way to grasp the preview image from QML?

Here is a sample to reproduce the behavior:

import QtQuick
import QtQuick.Controls
import QtMultimedia

Window {
    id: root

    width: 1024
    height: 600
    visible: true

    CaptureSession {
        id: captureSession
        videoOutput: output
        camera: Camera {} 
        imageCapture: ImageCapture {
            onImageCaptured: function (id, preview) {
                console.log(preview)
                image.source = preview
            }
        }
    }

    VideoOutput {
        id: output
        anchors.fill: parent
        Button {
            text: qsTr("Shot!")
            onClicked: captureSession.imageCapture.capture()
        }
    }

    Window {
        x: root.x - width
        y: root.y
        width: 250
        height: 250
        Image {
            id: image
            anchors.fill: parent
            fillMode: Image.PreserveAspectFit
        }
    }

    Component.onCompleted: captureSession.camera.start()
}