安装 qtdeclarative5-qtmultimedia-plugin 软件包，您应该会很好

Install the qtdeclarative5-qtmultimedia-plugin package and you should be good to go

sudo apt-get install qtdeclarative5-qtmultimedia-plugin

在这里也发现了相同的问题: https://github.com/robotology/yarp/issues/263

Found the same issue here as well: https://github.com/robotology/yarp/issues/263