Help wanted from opencvlibrary Guru WebCam image... to avi..

[patrik08]

IplImage* imgPtr  = cvQueryFrame( capture );

IplImage* imgPtr  = cvQueryFrame( capture );

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I am not really sure, but it seems that the image data ( pixel data ) is imgPtr->imageData.
I see you already have the image dimensions and the bit depth.

I suppose you will need a third party library to create an avi ( mplayer maybe? last time I checked it had the ability to encode video, or any other library you find fit ).
.

To grab and display image is not the problem

take a shoot here....

void QtGLContext::GrabImage()
{
    qDebug() << "### GrabImage gooo  ";
    const QString unixt = QString("_%1").arg(unixtime); 
    adesso.setDate(QDate::currentDate());
    const QString oggi = adesso.toString("d.M.yyyy"); 
    IplImage* img  = cvQueryFrame( capture );
    QString cfileName = QFileDialog::getSaveFileName(this, "Export image",oggi+unixt+".bmp", "*.bmp");
    if (!cfileName.endsWith(".bmp")) {
         cfileName = cfileName+".bmp"; 
     }
    QByteArray infile = cfileName.toAscii();
    cvSaveImage(infile.data(),img);
    QImage *i=new QImage(cfileName);
    const QString pngfileName = cfileName.replace(".bmp",".png");
    if (!i->isNull()) {
      qDebug() << "### valid img   "; 
    i->save(pngfileName,"PNG",100);
    } else {
    qDebug() << "### noooo valid img   "; 
    return;
    }
}

void QtGLContext::GrabImage()
{
    qDebug() << "### GrabImage gooo  ";
    const QString unixt = QString("_%1").arg(unixtime); 
    adesso.setDate(QDate::currentDate());
    const QString oggi = adesso.toString("d.M.yyyy"); 
    IplImage* img  = cvQueryFrame( capture );
    QString cfileName = QFileDialog::getSaveFileName(this, "Export image",oggi+unixt+".bmp", "*.bmp");
    if (!cfileName.endsWith(".bmp")) {
         cfileName = cfileName+".bmp"; 
     }
    QByteArray infile = cfileName.toAscii();
    cvSaveImage(infile.data(),img);
    QImage *i=new QImage(cfileName);
    const QString pngfileName = cfileName.replace(".bmp",".png");
    if (!i->isNull()) {
      qDebug() << "### valid img   "; 
    i->save(pngfileName,"PNG",100);
    } else {
    qDebug() << "### noooo valid img   "; 
    return;
    }
}

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Take avi from cam !!! or grab from source avi ... i not know....

i found
http://www.koders.com/cpp/fid8AC9F0D...5E42EF904.aspx
http://forum.hardware.fr/hfr/Program...et_90460_1.htm

void QtGLContext::GrabAvi()
{
    StopGrab();  /* dont display live cam opengl */
    qDebug() << "### avi gooo  ";
 
 int isColor=1;
 int fps=15;
 int frameW=640;
 int frameH=480;
 int nFrames=8;
 
CvVideoWriter* writer = cvCreateVideoWriter("out.avi", CV_FOURCC('M','J','P','G'),fps,cvSize(frameW,frameH),isColor); 
 
 for(int i=0;i<nFrames;i++){
        qDebug() << "### Frames  " << i;
        IplImage* img  = cvQueryFrame( capture );
        cvWriteFrame(writer, img);//add the frame to the file
} 
qDebug() << "### loop end .....  ";
      cvReleaseVideoWriter(&writer);
qDebug() << "### after write avi   ";
//////// cvReleaseCapture(&capture);  /* crash all */
/////StartGrab();
}

void QtGLContext::GrabAvi()
{
    StopGrab();  /* dont display live cam opengl */
    qDebug() << "### avi gooo  ";
    
 int isColor=1;
 int fps=15;
 int frameW=640;
 int frameH=480;
 int nFrames=8;

CvVideoWriter* writer = cvCreateVideoWriter("out.avi", CV_FOURCC('M','J','P','G'),fps,cvSize(frameW,frameH),isColor); 

 for(int i=0;i<nFrames;i++){
        qDebug() << "### Frames  " << i;
        IplImage* img  = cvQueryFrame( capture );
        cvWriteFrame(writer, img);//add the frame to the file
} 
qDebug() << "### loop end .....  ";
      cvReleaseVideoWriter(&writer);
qDebug() << "### after write avi   ";
//////// cvReleaseCapture(&capture);  /* crash all */
/////StartGrab();
}

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