Load a sequence of frames

[perseo]

Yes... this code works, because I probe with sdl surfaces and i saw the video

while ( (av_read_frame(pFormatCtx_l, &packet_l)>=0) && (av_read_frame(pFormatCtx_r, &packet_r)>=0) ) {
 
    if ( (packet_l.stream_index == videoStream_l) && (packet_r.stream_index == videoStream_r) ) {
      // Decode video frame 
      avcodec_decode_video(pCodecCtx_l, pFrame_l, &frameFinished_l, packet_l.data, packet_l.size);
      avcodec_decode_video(pCodecCtx_r, pFrame_r, &frameFinished_r, packet_r.data, packet_r.size);
      // Did we get a video frame?
      if ( (frameFinished_l) && (frameFinished_r) ) 
	{ 
	  img_convert( (AVPicture *) pFrameRGB_l, PIX_FMT_BGR24, (AVPicture*)pFrame_l, 
		       pCodecCtx_l->pix_fmt, pCodecCtx_l->width, pCodecCtx_l->height); 
	  img_convert( (AVPicture *) pFrameRGB_r, PIX_FMT_BGR24, (AVPicture*)pFrame_r, 
		       pCodecCtx_r->pix_fmt, pCodecCtx_r->width, pCodecCtx_r->height); 
 
	  // Write pixel data
	  for(ay=0; ay<img_h; ay++)
	    {    	      
	      memcpy(aux_l, pFrameRGB_l->data[0]+ay*pFrameRGB_l->linesize[0], ancho);
	      memcpy(aux_r, pFrameRGB_r->data[0]+ay*pFrameRGB_r->linesize[0], ancho);	      
	      // incrementar data_l, data_r para recorrer la imagen nueva e irla generando
	      aux_l += ancho;
	      aux_r += ancho;
	    }
 
	img_raw_set_data (img_l, data_l);
  	img_raw_set_data (img_r, data_r);
 
	data32_l = RGB24toARGB(img_l);
	data32_r = RGB24toARGB(img_r);
 
	qimg_l = QImage(data32_l, img_w, img_h, QImage::Format_RGB32); 
	qimg_r = QImage(data32_r, img_w, img_h, QImage::Format_RGB32); 
 
	leftLabel->setPixmap(QPixmap::fromImage(qimg_l));
	rightLabel->setPixmap(QPixmap::fromImage(qimg_r));
 
	}
      aux_l = data_l;
      aux_r = data_r; 
    }

while ( (av_read_frame(pFormatCtx_l, &packet_l)>=0) && (av_read_frame(pFormatCtx_r, &packet_r)>=0) ) {
   
    if ( (packet_l.stream_index == videoStream_l) && (packet_r.stream_index == videoStream_r) ) {
      // Decode video frame 
      avcodec_decode_video(pCodecCtx_l, pFrame_l, &frameFinished_l, packet_l.data, packet_l.size);
      avcodec_decode_video(pCodecCtx_r, pFrame_r, &frameFinished_r, packet_r.data, packet_r.size);
      // Did we get a video frame?
      if ( (frameFinished_l) && (frameFinished_r) ) 
	{ 
	  img_convert( (AVPicture *) pFrameRGB_l, PIX_FMT_BGR24, (AVPicture*)pFrame_l, 
		       pCodecCtx_l->pix_fmt, pCodecCtx_l->width, pCodecCtx_l->height); 
	  img_convert( (AVPicture *) pFrameRGB_r, PIX_FMT_BGR24, (AVPicture*)pFrame_r, 
		       pCodecCtx_r->pix_fmt, pCodecCtx_r->width, pCodecCtx_r->height); 
	  
	  // Write pixel data
	  for(ay=0; ay<img_h; ay++)
	    {    	      
	      memcpy(aux_l, pFrameRGB_l->data[0]+ay*pFrameRGB_l->linesize[0], ancho);
	      memcpy(aux_r, pFrameRGB_r->data[0]+ay*pFrameRGB_r->linesize[0], ancho);	      
	      // incrementar data_l, data_r para recorrer la imagen nueva e irla generando
	      aux_l += ancho;
	      aux_r += ancho;
	    }
	  
	img_raw_set_data (img_l, data_l);
  	img_raw_set_data (img_r, data_r);
	
	data32_l = RGB24toARGB(img_l);
	data32_r = RGB24toARGB(img_r);

	qimg_l = QImage(data32_l, img_w, img_h, QImage::Format_RGB32); 
	qimg_r = QImage(data32_r, img_w, img_h, QImage::Format_RGB32); 
	
	leftLabel->setPixmap(QPixmap::fromImage(qimg_l));
	rightLabel->setPixmap(QPixmap::fromImage(qimg_r));

	}
      aux_l = data_l;
      aux_r = data_r; 
    }

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[wysota]

It's a busy loop, so it won't work. You have to process events somewhere in between like jpn suggested.

[perseo]

I tried to introduce one timer and now i have one problem when i run the program:

private slots:
void updateLabel(unsigned char *data32_l, unsigned char *data32_r);
 
///////
QTimer *timer = new QTimer(this);
        connect(timer, SIGNAL(timeout()), this,   SLOT(updateLabel(data32_l,data32_r)));
	timer->start(); 
 
and the function updateLabel is:
 
void FormMain::updateLabel(unsigned char *data32_l, unsigned char *data32_r)
{
	timer->stop();
	qimg_l = QImage(data32_l, img_w, img_h, QImage::Format_RGB32); 
	qimg_r = QImage(data32_r, img_w, img_h, QImage::Format_RGB32); 
 
	leftLabel->setPixmap(QPixmap::fromImage(qimg_l)); 
	rightLabel->setPixmap(QPixmap::fromImage(qimg_r));
}

private slots:
void updateLabel(unsigned char *data32_l, unsigned char *data32_r);

///////
QTimer *timer = new QTimer(this);
        connect(timer, SIGNAL(timeout()), this,   SLOT(updateLabel(data32_l,data32_r)));
	timer->start(); 

and the function updateLabel is:

void FormMain::updateLabel(unsigned char *data32_l, unsigned char *data32_r)
{
	timer->stop();
	qimg_l = QImage(data32_l, img_w, img_h, QImage::Format_RGB32); 
	qimg_r = QImage(data32_r, img_w, img_h, QImage::Format_RGB32); 

	leftLabel->setPixmap(QPixmap::fromImage(qimg_l)); 
	rightLabel->setPixmap(QPixmap::fromImage(qimg_r));
}

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When i run the program i have this:

Object::connect: No such slot FormMain::updateLabel(data32_l,data32_r)
Object::connect: (receiver name: 'FormMainInterf')

I need help!

Thanks!

[pherthyl]

connect(timer, SIGNAL(timeout()), this, SLOT(updateLabel(data32_l,data32_r)));

connect(timer, SIGNAL(timeout()), this, SLOT(updateLabel(data32_l,data32_r)));

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That code makes no sense. You're hooking up timeout() to a slot expecting arguments. Where do you think this data is going to come from? Also you have to give connect the types of the arguments, not the names. So unsigned char* instead of data32_l.

[perseo]

Thank you very much to all, now my code works.
I use one timer.

[bmn]

I was able to load the sequence of frames into the label widget but having trouble with timing of the frames. It is displaying only the last frame of the file.