My QML app don't decode the QR code

[implor]

Hi, here i am again previously i had asked for help but that was a lib issue that finally i can solve, so, here's the new problem:
My App runs correctly, it keeps running searching for QR code but it never found 1 the code stay in bucle here:

onDecodingFinished:
{
    timePerFrameDecode = (decodeTime + framesDecoded * timePerFrameDecode) / (framesDecoded + 1);
    framesDecoded++;
    console.log("frame finished: " + succeeded, decodeTime, timePerFrameDecode, framesDecoded);
}

i know that the camera works fine with the same QR i'm trying to decode, i've tested it with another program. So i wonder if u can help ASAP. NOTE: the camera is started and closed when open or close qr_image_scan rectangle. (Neither your example works fine with me, but using third-party software linux QtQr app works, any idea if the configuration is not correct, ask for my mail if needed to send the project to you)

Here the code:

import QtQuick 2.11
import QtQuick.Controls 2.3
import QtQuick.Layouts 1.3
import QtQml.Models 2.3
import QtQuick.Controls.Material 2.4
import QtQuick.Window 2.3
import QtMultimedia 5.9
import QZXing 2.3
import QZXingFilter 2.3

ApplicationWindow {
    id: window
    visible: true
    width: 640
    height: 480

    Rectangle {
        id:qr_image_scan
        anchors.fill:parent
        visible: false
        color:"black"
        property bool isCameraAvailable: QtMultimedia.availableCameras.length > 0
        Image{
            id:imageToDecode
        }
        Camera{
            id:camerax
            position: Camera.BackFace
            captureMode: Camera.CaptureStillImage
            deviceId: QtMultimedia.availableCameras[0].deviceId
            opticalZoom: 0.0
            imageCapture {
                onImageCaptured: {
                    imageToDecode.source = preview
                    decoder.decodeImageQML(imageToDecode);
                }
            }
        }
        VideoOutput{
            id:videoOutput
            source:camerax
            //focus: visible
            anchors.fill:parent
            fillMode: VideoOutput.Stretch
            filters: [ zxingFilter ]
            MouseArea {
                anchors.fill: parent
                onClicked: {
                    camerax.focus.customFocusPoint = Qt.point(mouse.x / width,  mouse.y / height);
                    camerax.focus.focusMode = CameraFocus.FocusMacro;
                    camerax.focus.focusPointMode = CameraFocus.FocusPointCustom;
                }
            }
            Rectangle {
                id: captureZone
                color: "red"
                opacity: 0.2
                width: parent.width / 2
                height: parent.height / 2
                anchors.centerIn: parent
            }
        }
        QZXingFilter{
            id: zxingFilter
            captureRect: {
                // setup bindings
                videoOutput.contentRect;
                videoOutput.sourceRect;
                return videoOutput.mapRectToSource(videoOutput.mapNormalizedRectToItem(Qt.rect(
                                                                                           0.25, 0.25, 0.5, 0.5
                                                                                           )));
            }

            decoder {
                enabledDecoders: QZXing.DecoderFormat_QR_CODE

                onTagFound: {
                    console.log(tag + " | " + decoder.foundedFormat() + " | " + decoder.charSet());

                    window.detectedTags++;
                    window.lastTag = tag;
                }

                tryHarder: false
            }

            onDecodingStarted:
            {
                //            console.log("started");
            }

            property int framesDecoded: 0
            property real timePerFrameDecode: 0

            onDecodingFinished:
            {
                timePerFrameDecode = (decodeTime + framesDecoded * timePerFrameDecode) / (framesDecoded + 1);
                framesDecoded++;
                console.log("frame finished: " + succeeded, decodeTime, timePerFrameDecode, framesDecoded);
            }
        }
    }

[ftylitak]

Hello @implor

which platform are you targeting? Android? Linux? other?

[swex]

same here. decoding not working on 5.11 for somereason

[swex]

its not about target platform, but Qt version.

[ftylitak]

@swex
I have just built QZXingLive on Qt 5.11 for Android and it works. So may be i need more information to see that is the problem with your case.

@implor
Could you send me a sample image (QR code) that you try to decode and do not have success?
If you want to try our different QR codes that are already used in QZXing tests you can check out the qrcode related folder in the test resources: https://github.com/ftylitak/qzxing/tree/master/tests/resources

[seraphzxz87]

I have the same problem, QML decoding not work, the target platform is Linux.

[simonschmeisser]

I also tried QZXingLive with Qt5.11 on both Amd64 and Arm64 on linux and cannot decode any Qr code

[swex]

@simonschmeisser @seraphzxz87 check for my simple Qt/QML wrapper I've made around zxing-cpp works good for me for any Qt version.

[xuin-net]

I also tried QZXingLive with Qt5.11.3 on Macx and cannot decode any Qr code

[Thaodan]

I've updated the QZXing live example and I can verify i works indeed with Android.

[Thaodan]

see my pr #102

[Thaodan]

Doesn't work for me on Linux either (Arch Linux Qt5.12).
Using a regular captured image works thou.

[ftylitak]

Hello all,

today I had an available linux pc to test and i confirm that for some reason the decoding fails.
I will try to find some time to debug it.

Meanwhile, when deployed on Android it continues to work properly.

[ftylitak]

Hello all,

i have fixed the support of YUYV image decoding so now the decoding of images in Linux works.

Could you please give it a try and give me your feedback? I have added the solution to branch 86-fix-QZXingFilter-Linux . As soon as you confirm that it is ok, i will merge it to master.