沒有在ofVideoPlayer

Question

任何C++大師能告訴我，爲什麼我收到以下錯誤

我試着重新創建頭文件多次評爲idleMovie成員。

我的標題可能有問題嗎？

沒有在ofVideoPlayer

void testApp::setup(){ 

    // setup video dimensions 
    videoWidth = 320; 
    videoHeight = 240; 

    outputWidth = 320; 
    outputHeight = 240; 

    // masked image ofTexture 
    maskedImg.allocate(outputWidth,outputHeight,GL_RGBA); 

    // videograbber init 
    vidGrabber.setVerbose(true); 
    vidGrabber.initGrabber(videoWidth,videoHeight); 

    // background quicktime 
    vidPlayer.loadMovie("gracht5000.mov"); 
    vidPlayer.play(); 

    // video source 
    colorImg.allocate(outputWidth,outputHeight); 

    // grayscale source 
    grayImage.allocate(outputWidth,outputHeight); 
    // static difference image 
    grayBg.allocate(outputWidth,outputHeight); 
    // difference (mask) between grayscale source and static image 
    grayDiff.allocate(outputWidth,outputHeight); 

    bLearnBakground = true; 
    threshold = 80; 
} 

//-------------------------------------------------------------- 
void testApp::update() 
{  
    ofBackground(100,100,100); 
    bool bNewFrame = false; 
    vidPlayer.idleMovie(); 
    vidGrabber.grabFrame(); 
    bNewFrame = vidGrabber.isFrameNew(); 

    if (bNewFrame) 
    { 
     colorImg.setFromPixels(vidGrabber.getPixels(), outputWidth,outputHeight); 
     grayImage = colorImg;     

     // learn new background image 
     if (bLearnBakground == true){ 
      grayBg = grayImage; // the = sign copys the pixels from grayImage into grayBg (operator overloading) 
      bLearnBakground = false; 
     } 

     // take the abs value of the difference between background and incoming and then threshold: 
     grayDiff.absDiff(grayBg, grayImage); 
     grayDiff.threshold(threshold); 
     grayDiff.blur(3); 

     // pixels array of the mask 
     unsigned char * maskPixels = grayDiff.getPixels();  

     // pixel array of webcam video 
     unsigned char * colorPixels = colorImg.getPixels(); 

     // numpixels in mask 
     int numPixels = outputWidth * outputHeight; 

     // masked video image (RGBA) (final result) 
     unsigned char * maskedPixels = new unsigned char[outputWidth*outputHeight*4]; 

     // loop the mask 
     for(int i = 0; i < numPixels; i+=1) 
     { 
      int basePixelRGBA = 4 * i; 
      int basePixelRGB = 3 * i; 

      // compose final result 
      maskedPixels[ basePixelRGBA + 0 ] = colorPixels[basePixelRGB]; // take pixels from webcam source 
      maskedPixels[ basePixelRGBA + 1 ] = colorPixels[basePixelRGB+1]; // take pixels from webcam source 
      maskedPixels[ basePixelRGBA + 2 ] = colorPixels[basePixelRGB+2]; // take pixels from webcam source 
      maskedPixels[ basePixelRGBA + 3 ] = maskPixels[i]; // alpha channel from mask pixel array 
     } 

     // load final image into texture 
     maskedImg.loadData(maskedPixels, outputWidth,outputHeight, GL_RGBA); 

    } 



} 

//-------------------------------------------------------------- 
void testApp::draw(){ 

    ofSetColor(0xffffff); 

    // draw bg video 
    vidPlayer.draw(0,0); 

    // draw masked webcam feed 
    ofEnableAlphaBlending(); 
    maskedImg.draw(20,20); 
    ofDisableAlphaBlending(); 

    // info 
    ofSetColor(0xffffff); 
    char reportStr[1024]; 
    sprintf(reportStr, "bg subtraction and blob detection\npress ' ' to capture bg\nthreshold %i (press: +/-)\n, fps: %f", threshold, ofGetFrameRate()); 
    ofDrawBitmapString(reportStr, 20, 600); 

} 

Header中命名idleMovie成員

#pragma once 

#include "ofMain.h" 
#include "ofxOpenCv.h" 

class ofApp : public ofBaseApp{ 

    public: 
     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 windowResized(int w, int h); 
     void dragEvent(ofDragInfo dragInfo); 
     void gotMessage(ofMessage msg); 
     int videoWidth; 
     int videoHeight; 
     int outputWidth; 
     int outputHeight; 
     int threshold; 
     ofVideoGrabber vidGrabber; 
     ofVideoPlayer vidPlayer; 

     ofxCvColorImage colorImg; 
     ofxCvGrayscaleImage grayImage; 
     ofxCvGrayscaleImage grayBg; 
     ofxCvGrayscaleImage grayDiff; 
     ofTexture maskedImg; 
     bool bLearnBakground; 



}; 

Answer 1

vidPlayer.idleMovie();替換vidPlayer.update();

和vidGrabber.grabFrame();得到了由vidGrabber.update();