（1）sudo apt-get install mplayer
播放不了视频
（2）sudo apt-get install mplayer2
错误：Couldn't resolve name for AF_INET6: baishi.baidu.comResolving baishi.baidu.com for AF_INET...
Connecting to server baishi.baidu.com[115.239.210.38]: 80...
解决：
vi ~/.mplayer/config prefer-ipv4 = yes
