Qt5主要是使用QMediaPlayerList实现播放列表
如果要循环就在QMediaPlayerList中设置播放模式，setPlaybackMode
playlist = new QMediaPlaylist;
playlist->setCurrentIndex(1);
playlist->setPlaybackMode(QMediaPlaylist::CurrentItemInLoop);
player = new QMediaPlayer;
player->setPlaylist(playlist);
videoWidget = new QVideoWidget;
player->setVideoOutput(videoWidget);
videoWidget->show();
player->play();
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