main.cpp

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

//========================================================================
int main( ){
	ofSetupOpenGL(1024,768,OF_WINDOW);			// <-------- setup the GL context

	// this kicks off the running of my app
	// can be OF_WINDOW or OF_FULLSCREEN
	// pass in width and height too:
	ofRunApp(new ofApp());

}

ofApp.cpp

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup(){
    MO[0].setLoopState(OF_LOOP_NONE);
    MO[1].setLoopState(OF_LOOP_NONE);
    MOPointer = 0;
}
//--------------------------------------------------------------
void ofApp::update(){
    static int lastMod = ofGetElapsedTimeMillis();
    static int action = 0;
    static int moviecount = 1;
    static string movieFile = "";
    if (ofGetElapsedTimeMillis() - lastMod > 500) {
        if (action == 0) {
            cout << "Append " << ofToString(moviecount) << ".mp4" << endl;
            movieFile = ofToString(moviecount) + ".mp4";

/*            MO[MOPointer].close();*/
            MO[MOPointer].loadAsync(movieFile);

            action++;
            if (moviecount < 3)
                moviecount ++;
            else
                moviecount = 1;
        }
        else if (action == 1) {
            action = 0;
            MO[MOPointer].play();
            MOPointer = MOPointer == 1 ? 0 : 1;
        }
        lastMod = ofGetElapsedTimeMillis();
    }
    MO[0].update();
    MO[1].update();
}

//--------------------------------------------------------------
void ofApp::draw(){
    MO[0].draw(0,20 , 320, 240);
    MO[1].draw(330,20 , 320, 240);
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){

}

//--------------------------------------------------------------
void ofApp::keyReleased(int key){

}

//--------------------------------------------------------------
void ofApp::mouseMoved(int x, int y ){

}

//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mouseReleased(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mouseEntered(int x, int y){

}

//--------------------------------------------------------------
void ofApp::mouseExited(int x, int y){

}

//--------------------------------------------------------------
void ofApp::windowResized(int w, int h){

}

//--------------------------------------------------------------
void ofApp::gotMessage(ofMessage msg){

}

//--------------------------------------------------------------
void ofApp::dragEvent(ofDragInfo dragInfo){ 

}

ofApp.h

#pragma once

#include "ofMain.h"

class ofApp : public ofBaseApp{

	public:
        ofVideoPlayer   MO[2];
        int MOPointer;
		
        void setup();
		void update();
		void draw();

		void keyPressed(int key);
		void keyReleased(int key);
		void mouseMoved(int x, int y );
		void mouseDragged(int x, int y, int button);
		void mousePressed(int x, int y, int button);
		void mouseReleased(int x, int y, int button);
		void mouseEntered(int x, int y);
		void mouseExited(int x, int y);
		void windowResized(int w, int h);
		void dragEvent(ofDragInfo dragInfo);
		void gotMessage(ofMessage msg);
		
};