MoonL

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QT += multimedia multimediawidgets

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find_package(Qt6 REQUIRED COMPONENTS Multimedia MultimediaWidgets)
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target_link_libraries(MyApp Qt6::Multimedia Qt6::MultimediaWidgets)

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#include <QtMultimedia>
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#include <QtMultimediaWidgets>

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QMediaPlayer *player = new QMediaPlayer(this);
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QAudioOutput *audioOutput = new QAudioOutput(this);
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player->setAudioOutput(audioOutput);
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player->setSource(QUrl::fromLocalFile("/path/to/music.mp3"));
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connect(ui->btnPlay, &QPushButton::clicked, player, &QMediaPlayer::play);
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connect(ui->btnPause, &QPushButton::clicked, player, &QMediaPlayer::pause);
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connect(ui->sliderVolume, &QSlider::valueChanged, audioOutput, [audioOutput](int v) {
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    audioOutput->setVolume(v / 100.0);
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});
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player->play();

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QMediaPlayer *player = new QMediaPlayer(this);
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QAudioOutput *audioOutput = new QAudioOutput(this);
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QVideoWidget *videoWidget = new QVideoWidget(this);
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player->setAudioOutput(audioOutput);
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player->setVideoOutput(videoWidget);
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player->setSource(QUrl("file:///path/to/video.mp4"));
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videoWidget->show();
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player->play();

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QMediaCaptureSession *session = new QMediaCaptureSession(this);
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QCamera *camera = new QCamera(QMediaDevices::defaultVideoInput(), this);
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QVideoWidget *viewfinder = new QVideoWidget(this);
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session->setCamera(camera);
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session->setVideoOutput(viewfinder);
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camera->start();
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viewfinder->show();