Multiple webcams on Raspberry pi

arm
#1

Hello. I am trying to use two webcams in my app. I use two ofVideoGrabber, on the update method, updates both grabbers, but when draws, it flickers, shows some frames from webcam1 and some frames from webcam2.
If i use one videoGrabber, works just fine, I see that webcam.
I would like to draw both webcams. Any idea for solving this issue?
I am using Raspberry pi 4 and of 0.11.0

  void ofApp::setup(){
    camWidth = 320;  // try to grab at this size.
    camHeight = 240;

    vidGrabber.setDeviceID(2);
    vidGrabber.setDesiredFrameRate(60);
    vidGrabber.setUseTexture(true);
    vidGrabber.initGrabber(camWidth, camHeight);
    
    vidGrabber2.setDeviceID(0);
    vidGrabber2.setDesiredFrameRate(60);
    vidGrabber2.setUseTexture(true);
    vidGrabber2.initGrabber(camWidth, camHeight);

    ofSetVerticalSync(true);
}


//--------------------------------------------------------------
void ofApp::update(){
    ofBackground(100, 100, 100);    
    vidGrabber.update();
    vidGrabber2.update();
}

//--------------------------------------------------------------
void ofApp::draw(){
    ofSetHexColor(0xffffff);
    vidGrabber.draw(20, 20);
    vidGrabber2.draw(20, 40+camHeight);
}