Qt直接调用ffmpeg实现录屏功能

RecordManager.h

#ifndef RECORD_MANAGER_H
#define RECORD_MANAGER_H

#include 
#include 
#include "base/common.h"
#include 

class RecordManager :public QObject
{
	Q_OBJECT

public:

	void recordScreen();

	void endRecordScreen();

	void playback();

	~RecordManager();

private:
	RecordManager();

private:
	QProcess m_process;
	QString videopath; 

public:
	static RecordManager& GetInstance()
	{
		static RecordManager instance;
		return instance;
	}

};


#endif // !RECORD_MANAGER_H

RecordManager.cpp

#include "RecordManager.h"

#include 
#include 
#include 
#include 
#include 

RecordManager::RecordManager()
{
	QString path = QDir::currentPath();//当前工作路径
	videopath = path + "/image/screenVideo";

	int index = videopath.lastIndexOf("/");
	QString levelabovPath = videopath.left(index);
	QDir dir(levelabovPath);
	if (!dir.exists()) {
		bool ok = dir.mkdir(levelabovPath);//只创建一级子目录，即必须保证上级目录存在
	}

	dir.setPath(videopath);
	if (!dir.exists()) {
		bool ok = dir.mkdir(videopath);//只创建一级子目录，即必须保证上级目录存在
	}
}

RecordManager::~RecordManager()
{
	
}

void RecordManager::recordScreen()
{
	#ifdef Q_OS_LINUX
		// linux
	#endif

	#ifdef Q_OS_WIN32
		// win
		videopath = QDir::currentPath() + "/image/screenVideo" + "/" +
			QDateTime::currentDateTime().toString("yyyy-MM-dd....hh-mm-ss") + ".mp4";
		m_process.setProcessChannelMode(QProcess::MergedChannels);
		QDir dir("D:/ffmpeg-master-latest-win64-gpl-shared");
		if (!dir.exists()) {
			//日志记录
			//弹窗提示
		}
		QString cmd = QString("D:/ffmpeg-master-latest-win64-gpl-shared/bin/ffmpeg -f gdigrab -i desktop \
			-framerate 60 -offset_x 0 -offset_y 0 -video_size 1600x900  -pix_fmt yuv420p -vcodec libx264 -crf 18 %1").arg(videopath);
		m_process.start(cmd);
		QString errorstring = m_process.errorString();
	#endif
}

void RecordManager::endRecordScreen()
{
	if (m_process.isOpen())
	{
		m_process.write("q");
	}
}

void RecordManager::playback()
{
	QDesktopWidget* desktop = QApplication::desktop();

	QString path = QDir::currentPath();//当前工作路径
	QString videopath = path + "/image/screenVideo/";
	QDir dir(videopath);
	QString cou = QString::number(dir.count() - 2);

	QString videoNamePath = videopath + "Videotest" + cou + ".avi";
	QMediaPlayer* mediaPlayer = new QMediaPlayer;
	QRect desktopRect = QApplication::desktop()->availableGeometry();

	mediaPlayer->setMedia(QUrl(videoNamePath));
	QVideoWidget* videoWidget = new QVideoWidget;
	mediaPlayer->setVideoOutput(videoWidget);

	videoWidget->resize(desktop->width() - 10, desktop->height() - 80);
	videoWidget->move((desktop->width() - videoWidget->width() - 10) / 2, (desktop->height() - videoWidget->height() - 70) / 2);
	videoWidget->show();
	mediaPlayer->play();
}