How to display video from raw image data provided by camera SDK

[wo273127571]

Hello, I am developing windows desktop application during my part-time. Now I have a problem which puzzled me for one week.
I can get the camera data from the registered callback function to SDK. Pseudocode show below:

List imageList;//thread safe list
void (int width, int height, void* data)
{
	//here I can get the image data, and according to camera fsp N,
	//imageList can get N images per second, act as provider
	imageList.push(QImage(data));
}
 
//I use QLabel or QOpenGLWidget to display those images
class QMyLabel : public QLabel
{
	void paintEvent(QPaintEvent * event)
	{
		QImage img = imageList.pop();
		painter.drawImage(img);
	}
 
	QTimer timer = new QTimer(this);
	connect(timer, SIGNAL(timeout()), this, SLOT(update()));
	timer.start(60 / N);
}

List imageList;//thread safe list
void (int width, int height, void* data)
{
	//here I can get the image data, and according to camera fsp N,
	//imageList can get N images per second, act as provider
	imageList.push(QImage(data));
}

//I use QLabel or QOpenGLWidget to display those images
class QMyLabel : public QLabel
{
	void paintEvent(QPaintEvent * event)
	{
		QImage img = imageList.pop();
		painter.drawImage(img);
	}
	
	QTimer timer = new QTimer(this);
	connect(timer, SIGNAL(timeout()), this, SLOT(update()));
	timer.start(60 / N);
}

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But it display frame by frame, not smoothly. I have used std::share_ptr and std::move to avoid copy, but still can't fix it.
I Googled it but can't find a solution? Could anyone can give some tips?