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直入主题 错误提示：defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer" /plugins/mediaservice 下只有一个libqtmedia_audioengine.so 去开源下载一个qtmultimedia的源码（没改动里面的代码）编译出来也就只有上述的文件，求教应该如何解决。主要是QMediaPlayer能调整音量，QSound没有音量的接口
