收藏两个摄像头录制视频的demo之一：基于opencv实现
QT PRO文件需要加入：LIBS += -lopencv_core -lopencv_highgui，或者使用g++ 利用这个参数来编译非QT环境的代码。
#include <QCoreApplication>
#include <QtGui/QCloseEvent>
#include<opencv/cv.h>
#include<opencv/highgui.h>
void closeEvent(QCloseEvent *event);
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
cvNamedWindow("vedio");
CvCapture* capture = 0;
boolIsclose=true;
// 首先是要通过摄像设备来得到一个CvCapture对象
if(1 == argc)
{ // 从摄像头获取初始化对象CvCapture
capture = cvCreateCameraCapture(0);
}
else
{ // 从视频文件中获取初始化对象CvCapture
capture = cvCreateCameraCapture(atoi(argv[1]));
}
// 如果没有获取到有效的CvCapture对象，则返回 -1 终止程序运行
if(!capture)
{
return -1;
}
// QCloseEvent *closeEvent;
IplImage* frame;
//指定视频中每一帧的大小（我的摄像头拍摄下的图片均是160*120的）
CvSize size = cvSize(640,480);
//需要初始化一个写视频文件的对象，这里注意使用的编解码器格式是MJPG 帧率设置为5
CvVideoWriter* videoWriter =
cvCreateVideoWriter("my.avi",CV_FOURCC('M','J','P','G'),5,size);
char keyCode;
//每隔10ms，从摄像头中取出一帧
while((keyCode = cvWaitKey(10))&&Isclose)
{
if(keyCode == 27)
{
break;
}
//得到从摄像头中获取的帧
frame = cvQueryFrame(capture);
//将帧写入视频文件中
cvWriteFrame(videoWriter,frame);
cvShowImage("vedio",frame);
if(a.closingDown())
Isclose=false;
}
cvReleaseVideoWriter(&videoWriter);
cvReleaseImage(&frame);
cvDestroyWindow("video");
returna.exec();
}
效果如下：
这个图我就不传了，里面是我的头像。长得丑，怕吓到人。（Linux）
收藏两个摄像头录制视频的demo之二：基于QT实现
QT PRO文件需要加入如下：
QT += multimedia multimediawidgets
程序我改为QT5.0.2版本
/*dialog.h*/
#ifndef DIALOG_H
#defineDIALOG_H
#include<QtWidgets/QDialog>
#include<QtMultimedia/QCamera>
#include<QtMultimediaWidgets/QCameraViewfinder>
#include<QtMultimedia/QMediaRecorder>
#include<QtWidgets/QPushButton>
#include <QtWidgets/QLabel>
namespace Ui {
class Dialog;
}
class Dialog : public QDialog
{
Q_OBJECT
public:
explicit Dialog(QWidget *parent = 0);
~Dialog();
publicslots:
voidrecordVideo();
voidchangeDuration(qint64 seconds);
voidpause();
void stop();
private:
Ui::Dialog *ui;
QCamera* camera;
QCameraViewfinder* viewfinder;
QMediaRecorder* mediaRecorder;
QPushButton* recordButton ;
QPushButton* pauseButton ;
QPushButton* stopButton;
QPushButton* exitButton;
QLabel* timeDisplay;
};
#endif// DIALOG_H
/*dialog.cpp*/
#include "dialog.h"
#include "ui/ui_dialog.h"
#include<QtWidgets/QHBoxLayout>
#include <QtWidgets/QVBoxLayout>
#include <QtWidgets/QPushButton>
#include<QUrl>
Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
// ui->setupUi(this);
QByteArray cameraDevice = QCamera::availableDevices()[0];
camera = new QCamera(cameraDevice);
QHBoxLayout* layout = new QHBoxLayout;
viewfinder = new QCameraViewfinder(this);
viewfinder->resize(640,480);
QVBoxLayout* vLayout = new QVBoxLayout ;
recordButton = new QPushButton("record", this);
pauseButton = new QPushButton("pause", this);
stopButton = new QPushButton("stop", this);
exitButton = new QPushButton("exit", this);
timeDisplay = new QLabel(this);
vLayout->addWidget(recordButton);
vLayout->addWidget(pauseButton);
vLayout->addWidget(stopButton);
vLayout->addWidget(timeDisplay);
vLayout->addWidget(exitButton);
connect(recordButton, SIGNAL(clicked()), this, SLOT(recordVideo()));
connect(pauseButton,SIGNAL(clicked()),this, SLOT(pause()));
connect(stopButton,SIGNAL(clicked()), this,SLOT(stop()));
connect(exitButton,SIGNAL(clicked()), this, SLOT(close()));
layout->addWidget(viewfinder);
layout->addLayout(vLayout);
camera->setViewfinder(viewfinder);
camera->setCaptureMode(QCamera::CaptureVideo);
camera->start();
mediaRecorder = new QMediaRecorder(camera);
connect(mediaRecorder, SIGNAL(durationChanged(qint64)), this, SLOT(changeDuration(qint64)));
setLayout(layout);
}
Dialog::~Dialog()
{
deletemediaRecorder;
delete camera;
}
void Dialog:: recordVideo()
{
qDebug() << "record video";
mediaRecorder->setOutputLocation(QUrl("/home/zhanghaijun/testclip"));
mediaRecorder->record();
//QString str = QString("Recorded %1 sec").arg(mediaRecorder->duration());
//timeLabel->setText(str);
}
void Dialog:: changeDuration(qint64 seconds)
{
qDebug() << seconds;
//QString str = QString("Recorded %1 sec").arg(seconds);
timeDisplay->setNum(int(seconds));
}
voidDialog::pause()
{
qDebug() << "pause";
mediaRecorder->pause();
}
void Dialog::stop()
{
mediaRecorder->stop();
}
效果图如下：
这个也不传。
两个对比了下，个人感觉QT的类库做的比Opencv效果处理会更好点，在相同的灯光下会明显感觉清晰。本来还有个基于v4l2的demo，一直没调试出来。以后有时间再学习下。这两个都实现的是录像功能，但是在视频内加入声音还没有实现，这也等以后有时间来实现下。