本文解决GStreamer安装缺失插件的问题，并提供在Ubuntu14.04及16.04上安装所需插件的步骤，同时解决Nodecoder可用性问题，确保视频类型如MP4在QMediaPlayer上的正常播放。
1. Your GStreamer installation is missing a plug-in.
参考：https://stackoverflow.com/questions/26099139/how-to-fix-gstreamer-error-in-qt5
Ubuntu16.04:
sudo add-apt-repository ppa:mc3man/gstffmpeg-keep
sudo apt-get update
sudo apt-get install gstreamer0.10-ffmpeg
sudo apt-get gstreamer1.0-plugins-bad
Ubuntu 14.04：
sudo add-apt-repository ppa:mc3man/gstffmpeg-keep
sudo apt-get update
sudo apt-get install gstreamer0.10-ffmpeg
sudo apt-get install gstreamer0.10-plugins-ugly
2. No decoder available for type 'video……
参考：MP4 with GStreamer and QMediaPlayer on Ubuntu 16.04 LTS
http://www.open-terrain.org/index.php/Pong/August30th2016QMediaPlayerOnUbuntu16-04LTS
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