QT-Qt中MediaPlay的使用

相关资料：

https://blog.csdn.net/itas109/article/details/83829396

https://blog.csdn.net/birenxiaofeigg/article/details/104129207

https://www.cnblogs.com/zhangyi-studio/p/8596837.html

PS:

1.工程文件.pro需要引入 multimedia multimediawidgets 二个库。

2.引入#include <QMediaPlayer>   #include <QVideoWidget>   #include <QMediaPlaylist>三个文件。

3.播放无图像，并报错 “DirectShowPlayerService::doRender: Unresolved error code 80040266”，原因：Qt 中的多媒体播放，底层是使用DirectShowPlayerService，所以安装一个DirectShow解码器，例如LAV Filters，就可以解决运行出错问题。

4.安装LAV Filters后，出现花屏，卡屏问题，卸载之前安装的”LAV Filters“，安装”K-Lite Codec Pack“，本博主推荐使用”K-Lite Codec Pack“。

LAV Filters下载：https://github.com/Nevcairiel/LAVFilters/releases

K-Lite Codec Pack下载：https://pc.qq.com/detail/8/detail_528.html

.pro

QT       += core gui multimedia multimediawidgets

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11
#CONFIG += console

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += 
    main.cpp 
    mainwindow.cpp 
    showMediaPlay.cpp

HEADERS += 
    mainwindow.h 
    showMediaPlay.h

FORMS += 
    mainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

RESOURCES += 
    rec.qrc

main.cpp

#include <QApplication>

#include "showMediaPlay.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    showMediaPlay *oShowMediaPlay = new showMediaPlay;
    oShowMediaPlay->exec();
    return a.exec();
}

showMediaPlay.h

#ifndef SHOWMEDIAPLAY_H
#define SHOWMEDIAPLAY_H

#include <QDialog>
#include <QMediaPlayer>
#include <QVideoWidget>
#include <QMediaPlaylist>

#include<QDebug>
#include<QFileDialog>
#include<QVBoxLayout>
#include<QFile>
#include<QMessageBox>
#include<QPushButton>

class showMediaPlay : public QDialog
{
    Q_OBJECT
public:
    showMediaPlay(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
    ~showMediaPlay();
private:
    QVBoxLayout *layout = new QVBoxLayout;
    QPushButton *play = new QPushButton;
    QPushButton *stop = new QPushButton;
    QPushButton *paused = new QPushButton;
    QPushButton *duration = new QPushButton;

    QMediaPlayer* player = new QMediaPlayer;
    QVideoWidget* videoWidget = new QVideoWidget;
    QMediaPlaylist* playlist=new QMediaPlaylist;
private:
    int m_nCount;
private slots:
    void playVideo();
    void stopVideo();
    void pausedVideo();
    void showduration();
    void getDuration(qint64 playtime);
};

#endif // SHOWMEDIAPLAY_H

showMediaPlay.cpp

#include "showMediaPlay.h"

showMediaPlay::showMediaPlay(QWidget *parent, Qt::WindowFlags f)
    :QDialog(parent, f)
{
    this->resize(400, 300);
    m_nCount = 0;
    layout = new QVBoxLayout;
    play = new QPushButton;
    play->setText(QStringLiteral("播放"));
    stop = new QPushButton;
    stop->setText(QStringLiteral("停止"));
    paused = new QPushButton;
    paused->setText(QStringLiteral("暂停"));
    duration = new QPushButton;
    duration->setText(QStringLiteral("持续时间"));
    player = new QMediaPlayer;
    videoWidget = new QVideoWidget(this);
    videoWidget->setAspectRatioMode(Qt::IgnoreAspectRatio);
    playlist = new QMediaPlaylist;
    layout->addWidget(play);
    layout->addWidget(stop);
    layout->addWidget(paused);
    layout->addWidget(duration);
    layout->addWidget(videoWidget);
    layout->setMargin(0);
    this->setLayout(layout);
    playlist->clear();
    playlist->addMedia(QUrl::fromLocalFile("E:\AA.mp4"));
    player->setPlaylist(playlist);
    QFile file("E:\AA.mp4");
    if(!file.open(QIODevice::ReadOnly))
    qDebug() << "Could not open file";
    player->setVideoOutput(videoWidget);
    player->setPlaylist(playlist);
    player->play();
    connect(play, &QPushButton::clicked, this, &showMediaPlay::playVideo);
    connect(stop, &QPushButton::clicked, this, &showMediaPlay::stopVideo);
    connect(paused, &QPushButton::clicked, this, &showMediaPlay::pausedVideo);
    connect(duration, &QPushButton::clicked, this, &showMediaPlay::showduration);
    connect(player, &QMediaPlayer::durationChanged, this, &showMediaPlay::getDuration);
}

showMediaPlay::~showMediaPlay()
{

}

void showMediaPlay::playVideo()
{
    player->play();
}

void showMediaPlay::stopVideo()
{
    player->stop();
}

void showMediaPlay::pausedVideo()
{
    player->pause();
}

void showMediaPlay::showduration()
{
    setWindowTitle(QString("duration:%1  position:%2 ").arg(player->duration()).arg(player->position()));
}

void showMediaPlay::getDuration(qint64 playtime)
{
    m_nCount = m_nCount + 1;
    setWindowTitle(QString("int:%1  duration:%2  position:%3 ").arg(m_nCount).arg(playtime).arg(player->position()));
    if (0 == playtime)
    {
        accept();
    }
}