Problem running the QCamera

Torben

Hello,

I'm trying to set up a simple VideoGrabber. But the VideoGrabber does not work.
The VideoGrabber will be found, so if I print the device description it gives me the information.

The code which does this is actually very small:

QCamera * camera = new QCamera();

QCameraViewfinder * viewfinder = new QCameraViewfinder();
viewfinder->show();
camera->setViewfinder(viewfinder);

camera->start();

It returns with the following error message:
failed to renderstream -2147024809
failed to openStream()
Stream did not open

As VideoGrabber (the one which makes problems) I have one from Digitus.
On the other hand I have a working VideoGrabber, which is from EasyCAP. But this VideoGrabber I can just use for testing. I need the one from Digitus running, so I don't have the possiblity to change the VideoGrabber.

Any suggestions what I can do?

I also looked up, how I could change which input device it is using, but I didn't found sth. to this. So I think it uses the S-Video input instead of the CVBS signal. Any suggestions how I could change this?

I'm running the Qt Version 5.1 on a Windows 7.

SGaist

Hi and welcome to devnet,

Might be a silly question but did you check whether your Digitus grabber works properly outside of Qt ? Is it supported by Windows WMF ? DirectX ?

Torben

Thx for your quick response.

Yes it is working outside of Qt. For example it runs in the vlc Player. But there is also the problem that I have to set the device to CVBS and do not use the default S-Video input. I'm not sure how I could change this by Qt?

SGaist

What devices does QCameraInfo::availableCameras() return ?

Torben

So I don't have QCameraInfo cause I use Qt 5.1.
But QCamera::availableDevices() gives me the same information, I think.

It returns the following:
@device:pnp:\?\usb#vid_eb1a&pid_2821&mi_00#6&18118bcd&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}{54353d15-e717-4d94-b574-685ce1a209e9}

As the device description it returns:
USB 2821 Device