缺少相应的插件
sudo apt-get install ubuntu-restricted-extras
sudo apt-get install gstreamer0.10-plugins-bad
sudo apt-get install gstreamer0.10-plugins-ugly
参考网页：http://blog.csdn.net/zhanghaipeng1989/article/details/43271869
原文：https://www.cnblogs.com/WuXiangChen/p/10332488.html