"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 ?