ofxFaceTracker2 multiwindow thread issues

readme.md

demo ofxFaceTracker2 threading issues

This simple example demonstrating ofxFaceTracker2 threading issues related to openframeworks second window. The application erratically crashes when running in release mode; resulting in the following error:

OpenCV Error: Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x + roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in Mat, file ... /opencv/modules/core/src/matrix.cpp, line 323

[ fatal ] ofThreadErrorLogger::exception: ... /opencv/modules/core/src/matrix.cpp:323: error: (-215) 0 <= roi.x && 0 <= roi.width && roi.x + roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows in function Mat

Dependencies

• openframeworks 0.9.8
• ofxOpenCv
• ofxCv
• ofxFaceTracker2

main.cpp

#include "ofMain.h"
#include "ofApp.h"

//========================================================================
int main( ){
    
    ofGLFWWindowSettings settings;
    
    settings.width = 1024;
    settings.height = 480;
    settings.setPosition(ofVec2f(100, 100));
    settings.resizable = true;
    shared_ptr<ofAppBaseWindow> mainWindow = ofCreateWindow(settings);
    
    settings.width = PROJECTOR_WIDTH;
    settings.height = PROJECTOR_HEIGHT;
    settings.setPosition(ofVec2f(ofGetScreenWidth(), 0));
    settings.resizable = false;
    settings.decorated = false;
    settings.shareContextWith = mainWindow;
    shared_ptr<ofAppBaseWindow> secondWindow = ofCreateWindow(settings);
    secondWindow->setVerticalSync(true);
    secondWindow->setFullscreen(true);
    
    shared_ptr<ofApp> mainApp(new ofApp);
    ofAddListener(secondWindow->events().draw, mainApp.get(), &ofApp::drawSecondWindow);
    
    ofRunApp(mainWindow, mainApp);
    ofRunMainLoop();
    
}

ofApp.cpp

#include "ofApp.h"
#include "ofxCv.h"

//--------------------------------------------------------------
void ofApp::setup(){
    cam.setDesiredFrameRate(25);
    cam.setup(640, 480);
    
    tracker.setup(ofToDataPath("shape_predictor_68_face_landmarks.dat"));
    tracker.setThreaded(true); // there is a thread related bug with using a second window
    
    found = false;
}

//--------------------------------------------------------------
void ofApp::update(){
    cam.update();
    if (cam.isFrameNew()) {
        cv::Mat camMat = ofxCv::toCv(cam);
        tracker.update(camMat);
        if ((found = tracker.size() > 0)) {
            
        }
    }
}

//--------------------------------------------------------------
void ofApp::draw(){
    ofBackground(0);
    ofSetColor(255);
    cam.draw(0, 0);
    tracker.drawDebugPose();
}

//--------------------------------------------------------------
void ofApp::drawSecondWindow(ofEventArgs &args) {
    if(found) {
        tracker.drawDebugPose();
        tracker.drawDebug();
    }
}

ofApp.h

#pragma once

#define PROJECTOR_WIDTH 800
#define PROJECTOR_HEIGHT 600

#include "ofMain.h"
#include "ofxFaceTracker2.h"

class ofApp : public ofBaseApp{

public:
    void setup();
    void update();
    void draw();
    void drawSecondWindow(ofEventArgs &args);
    
    ofxFaceTracker2 tracker;
    ofVideoGrabber cam;
    bool found;
};