Using QCamera with multiple cameras

sulabh

Hello, I am trying to show the one camera output on two QLabel widget. However I am not able to do so. I encounter following error.

Graph failed to connect filters -2147024809

However I can see it on one screen not on another. If this is a wrong approach or is it not possible at all?

cM = new QCamera(this);
cM2 = new QCamera(this);
cV = new QCameraViewfinder(this);
cV2 = new QCameraViewfinder(this);
mMenu = new QMenu("Options",this);
cA = new QAction("one camera", this);
cA2 = new QAction("both camera", this);
mMenu->addActions({cA, cA2});
ui->pushButton->setMenu(mMenu);
cM->setViewfinder(cV);
cM2->setViewfinder(cV2);
cBox1 = new QVBoxLayout();
cBox2 = new QVBoxLayout();
cBox1->addWidget(cV);
cBox2->addWidget(cV2);
ui->label->setLayout(cBox1);
ui->label_2->setLayout(cBox2);
connect(cA, &QAction::triggered, [&](){

   
    cM->start();

    cM2->start();
});

Chris Hennes

This post is deleted!

SGaist

Hi and welcome to devnet,

You should setup both your cameras explicitly using e.g. QCameraInfo.

sulabh

@SGaist Hi Thank you for your reply. Main issue is regarding the device, I have one device which has two ports. This means i can only activate one at a time. In case, I need to change to another camera i always have to switch the channel. My idea was to display both at a time by switching channel very fast. So it looks like they are both working.

Anyway is it possible to display one live stream on two different screens(same widget type)? However i could not find what this error means.

Thank you for your reply.

SGaist

The error message indicates that the direct show backend failed the setup.

What kind of camera is it ?

sulabh

@SGaist Hey it finally worked... Thanks for the help

SGaist

You're welcome !

What did you do to make it work ?