"Corrupt JPEG data" error while using camera

MrHandSOme

Hello community,

I add a widget to my application that shows the camera view.

    _mediaCaptureSession = new QMediaCaptureSession();
    _currentCam = new QCamera();
    _currentCam->setCameraDevice(QMediaDevices::defaultVideoInput());
    _mediaCaptureSession->setCamera(_currentCam);

    _verticalLayout = new QVBoxLayout(_container);
    _videoWidget = new QVideoWidget();
    _mediaCaptureSession->setVideoOutput(_videoWidget);
    _verticalLayout->addWidget(_videoWidget);

    _videoWidget->setAspectRatioMode(Qt::AspectRatioMode::KeepAspectRatio);

    _currentCam->start();

Camera works great but constantly giving error.

qt.gui.imageio.jpeg: Corrupt JPEG data: 2 extraneous bytes before marker 0xd5
qt.gui.imageio.jpeg: Corrupt JPEG data: 2 extraneous bytes before marker 0xd2
qt.gui.imageio.jpeg: Corrupt JPEG data: 5 extraneous bytes before marker 0xd0
qt.gui.imageio.jpeg: Corrupt JPEG data: 10 extraneous bytes before marker 0xd2
qt.gui.imageio.jpeg: Corrupt JPEG data: 2 extraneous bytes before marker 0xd3
qt.gui.imageio.jpeg: Corrupt JPEG data: 4 extraneous bytes before marker 0xd5
qt.gui.imageio.jpeg: Corrupt JPEG data: 2 extraneous bytes before marker 0xd0
qt.gui.imageio.jpeg: Corrupt JPEG data: 5 extraneous bytes before marker 0xd7
qt.gui.imageio.jpeg: Corrupt JPEG data: 3 extraneous bytes before marker 0xd1

How do I solve this error? Thanks!

I am using QT 6.6.0 on Ubuntu.

SGaist

Hi,

Did you check the exact format of the images generate by your camera ?
There might be something off there.

MrHandSOme

@SGaist said in "Corrupt JPEG data" error while using camera:

There might be something off there.

How can i check that?

SGaist

The camera documentation should be a good start.

MrHandSOme

I did not find anything about on internet but model is "Samsung C505e HD BUSINESS WEBCAM"

SGaist

Isn't that a Logi webcam ?

MrHandSOme

@SGaist I am so sorry. I confused. Yes, it is Logi webcam.

SGaist

Two things I would do:

Save an image using Qt on disk and analyze it
Save an image with OpenCV on disk and analyze it
Check if there's something off in each image and also compare the two.

LL L

I don't know if you guys found the root cause; I have almost the same erros message while load dataurl in TextArea/QML using latest qt 6.8.1, yes, no such message in qt 6.8.0, same dataurl string (static compiled in c++ part.).

24-12-05 10:02:01.456 qt.gui.imageio.jpeg <Warni> qjpeghand: 61 > Corrupt JPEG data: 66 extraneous bytes before marker 0xdb
24-12-05 10:02:01.457 qt.gui.imageio.jpeg <Warni> qjpeghand: 61 > Quantization table 0x00 was not defined
24-12-05 10:02:01.457 qt.gui.imageio.jpeg <Warni> qjpeghand: 61 > Quantization table 0x00 was not defined
24-12-05 10:02:01.458 qt.gui.imageio.jpeg <Warni> qjpeghand: 61 > Corrupt JPEG data: 66 extraneous bytes before marker 0xdb
24-12-05 10:02:01.458 qt.gui.imageio.jpeg <Warni> qjpeghand: 61 > Quantization table 0x00 was not defined
24-12-05 10:02:01.458 qt.gui.imageio.jpeg <Warni> qjpeghand: 61 > Quantization table 0x00 was not defined
24-12-05 10:02:01.459 qt.gui.imageio.jpeg <Warni> qjpeghand: 61 > Corrupt JPEG data: 66 extraneous bytes before marker 0xdb
24-12-05 10:02:01.459 qt.gui.imageio.jpeg <Warni> qjpeghand: 61 > Quantization table 0x00 was not defined
24-12-05 10:02:01.460 qt.gui.imageio.jpeg <Warni> qjpeghand: 61 > Quantization table 0x00 was not defined
24-12-05 10:02:01.554 qt.gui.imageio.jpeg <Warni> qjpeghand: 61 > Corrupt JPEG data: 66 extraneous bytes before marker 0xdb
24-12-05 10:02:01.555 qt.gui.imageio.jpeg <Warni> qjpeghand: 61 > Quantization table 0x00 was not defined
24-12-05 10:02:01.555 qt.gui.imageio.jpeg <Warni> qjpeghand: 61 > Quantization table 0x00 was not defined

SGaist

@LL-L hi,

Are you using the default backend ?