Qt视频播放器

QMediaPlayer(电影放映员)、QMediaPlaylist(电影胶带)、QVideoWidget(电影屏幕)

//设置播放器的播放队列
m_player->setPlaylist(m_playerlist);
//设置播放器的显示窗口
m_player->setVideoOutput(m_videowidget);

进度条和视频联合使用的三个步骤

1.设置进度条的最大值

    //QMediaPlayer.duration()的作用是获得当前播放媒体的总时间
    connect(m_player,&QMediaPlayer::durationChanged,[=](){
        auto max = m_player->duration();
        ui->sd_time->setMaximum(max);

    });

2.视频跟着进度条动

    //滑动条动，视频跟着动
    connect(ui->sd_time,&QSlider::valueChanged,[=](){
        int pos = ui->sd_time->value();
        m_player->setPosition(pos);
    });

3.进度条跟着视频动

     //进度条跟着视频的位置动
    connect(m_player,&QMediaPlayer::positionChanged,[=](){

        ui->sd_time->setValue(m_player->position());

        //设置时间显示器
        int max = m_player->duration();
        //转换成时间
        QTime all_time = QTime::fromMSecsSinceStartOfDay(max);
        //        ui->lb_time->setText(time.toString("hh:mm:ss:zzz"));
        auto now = m_player->position();
        QTime current_time = QTime::fromMSecsSinceStartOfDay(now);
        ui->lb_time->setText(current_time.toString("hh:mm:ss")+"/"+all_time.toString("hh:mm:ss"));

    });

功能

播放：player->start()

暂停：player->pause()

停止:player->stop()