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 looking at the QCamera example gave me a lot of info to fix my issue.
I was using the QCamera wrongly.
Too many start/stop followed by lock/unlock etc.
Now the image is captured correctly.

IIRC, OBS makes it virtual webcam usable to other applications. I haven't gone through their sources though so I currently don't know how they do it.

I added the following two lines of code and it worked:

QHBoxLayout *camera_layout = new QHBoxLayout(this); mCamera = new QCamera(); mCameraViewfinder = new QCameraViewfinder(); camera_layout->addWidget(mCameraViewfinder); mCamera->setViewfinder(mCameraViewfinder); mCamera->start();

And it worked

I might be wrong but I think 5.6.3 was still using gstreamer 0.1.

Note that this version is really outdated, can you update to a more recent LTS version ? Current is 5.15.

Hi i think you want import on your .pro file this
QT += core gui multimedia multimediawidgets

You can use QNetworkAccessManager upload the contents to the GoogleDrive. Also you need to setup the GoogleDrive for accessing like web-server.

I don't think there's an easy way to do that except by going lower level.

Hi and welcome to devnet,

Qt uses native system call for that task so it returns whatever Windows wants to communicate about the hardware.

However listing and accessing are likely two different independent aspects.

Try adding m_imageCapture.setCaptureDestination(QCameraImageCapture::CaptureToFile);.

P.S.

QCheckBox *cam = new QCheckBox(ci.description()); vailableCameras->setItemWidget(lwi, cam);

Hurts my feelings. See https://forum.qt.io/post/486329 it applies also to QListWidgetItem with the only difference that you don't, obviously, specify a column

2nd UPDATE:

Problem was by natural source. The light reflects from window into camera.
2nd problem was using file as buffer.

I solved it by using grab image from QCameraViewFinder widget and send by memory.

This is a bug in 5.9.0. The newer version 5.9.2 does not have the crash problem

@kshegunov I think you are right. By just putting the lightentity into the camera:

Qt3DCore::QEntity *lightEntity = new Qt3DCore::QEntity(basicCamera);

It seems to move dynamically. Now I have to set some other things but that might have to do just with how I want my objects to show :)

I didn't wrote that there was any problem with your webcam, just that the backend used might not implement these parameters.

You can check which backend is loaded by setting the "Q_DEBUG_PLUGINS" environment variable to 1 in the Run part of the Project panel in Qt Creator.

@Daniel-Nilsson did you get the solution to this?

alright, I'll try that, thanks.

With the techniques used in QOrbitCameraController you cannot yet handle wheel events. This will be implemented in Qt 5.8 AFAIK.

If you want to have something now you will have to implement it the old fashoined way i.e. override the virtual function void Qt3DWindow::wheelEvent(QWheelEvent *ev) and there change the field of view of the camera().

Hi,

What kind of camera are you going to connect to ? Are they already supported by GStreamer ?