QCameraImageProcessingControl errors logs, but QCamera works as well

[acetone]

I have a simple QCamera Qt5.15 application. All works OK, but I see in console:

Unable to query the parameter info: QCameraImageProcessingControl::WhiteBalancePreset : "Invalid argument"
Unable to query the parameter info: QCameraImageProcessingControl::ColorTemperature : "Invalid argument"
Unable to query the parameter info: QCameraImageProcessingControl::SaturationAdjustment : "Invalid argument"
Unable to query the parameter info: QCameraImageProcessingControl::SharpeningAdjustment : "Invalid argument"

How to fix it (simply disable)?

Default Qt QCamera example also works with same errors in console.

[SGaist]

Hi,

On which OS are you ?

Not all backend are equals depending on the platform.

[acetone]

@SGaist MX Linux 21.3 (Debian based distrib)

GStreamer installed from here: https://gstreamer.freedesktop.org/documentation/installing/on-linux.html?gi-language=c#install-gstreamer-on-ubuntu-or-debian

QCamera works

[SGaist]

@acetone how are you accessing these controls ?

[acetone]

@SGaist

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    QCamera* camera = new QCamera(QCameraInfo::defaultCamera());
    QCameraImageCapture* capture = new QCameraImageCapture(camera);
    QCameraViewfinder finder(nullptr);
    camera->setViewfinder(&finder);
    QObject::connect(capture, &QCameraImageCapture::readyForCaptureChanged, [&](bool ready) {
        if (ready) {
            capture->capture();
        }
    });

    QObject::connect(capture, &QCameraImageCapture::imageCaptured, [&](int id, QImage img) {
        Q_UNUSED(id);
        QByteArray buffer;
        QBuffer imageBuffer(&buffer);
        imageBuffer.open(QIODevice::WriteOnly);
        img.save(&imageBuffer, "JPG");

        qInfo() << "Image captured and saved to buffer!";
        app.quit();
    });

    camera->setCaptureMode(QCamera::CaptureMode::CaptureStillImage);
    camera->start();
    capture->setCaptureDestination(QCameraImageCapture::CaptureToBuffer);
    capture->setBufferFormat(QVideoFrame::Format_RGB32);

    return app.exec();
}

I have only one camera and defaulDefice() return it (/dev/video0)

[SGaist]

Are you using your distribution provided Qt ?

[acetone]

@SGaist yep. Distribution from Qt Online Installer. GStreamer was installed directly only.

[SGaist]

So you are not using your distribution provided Qt. Please try with this one.

[acetone]

@SGaist how do I do that? There is no GStreamer item in the online installer. When running the application with QCamera, there were errors in the console about the absence of this library. I installed it. Everything else (all Qt binaries) is installed through the official installer.

[jsulm]

@acetone said in QCameraImageProcessingControl errors logs, but QCamera works as well:

There is no GStreamer item in the online installer

@SGaist suggested to try with Qt provided by your Linux distribution, not Qt online installer