QT application programming: Use QTAV to get each frame of decoded video

1. Environmental introduction

Operating system:  win10 64 bit

QT version:   QT5.12.6

Compiler:   MinGW 32

QtAV version:   QtAV-1.12.0

FFMPEG version :   ffmpeg 3.1 uses the package provided by QtAV, use it directly

Two, QTAV compilation and installation process

Reference blog: https://blog.csdn.net/xiaolong1126626497/article/details/112209279 

Three, get the image data of each frame of the decoded video

Idea: Inherit VideoOutput and re-implement the receiveFrame function.

#include <QObject>
#include <QWidget>
#include <VideoOutput.h>
#include <QDebug>

using namespace QtAV;

class my_qtav_videoOut: public VideoOutput
{
    Q_OBJECT
public:
    my_qtav_videoOut(QObject *parent = nullptr);
signals:
    void SendOneFrame(QImage img);
protected:
    //接收帧
    bool receiveFrame(const VideoFrame& frame);
};
my_qtav_videoOut::my_qtav_videoOut(QObject *parent)
{

}

//接收帧
bool my_qtav_videoOut::receiveFrame(const VideoFrame& frame)
{
    //得到每帧的图像
    QImage Image=frame.toImage();
    //将得到的一帧数据传递出去
    emit SendOneFrame(Image);
    return true;
}

How to use:

my_qtav_videoOut *m_vo;
AVPlayer *m_player;
Widgets::registerRenderers();
m_player = new AVPlayer(this);
m_vo=new my_qtav_videoOut(this);
m_player->setRenderer(m_vo);
//关联播放器的视频帧显示
connect(m_vo, SIGNAL(SendOneFrame(QImage)),ui->widget,SLOT(slotGetOneFrame(QImage)));