环境：ubuntu18.04 Qt5.9.5
描述：项目需要使用qtquick作为显示界面用于播放从网络摄像头抓取的影像，海康网络摄像头，摄像头源协议使用的是rtsp，影像数据格式为x-h264，但在调试时报错。
Item{ MediaPlayer{ id: player source: "rtsp://admin:gene123456@192.168.10.64:554/h264/ch1/main/av_stream" autoPlay: true } VideoOutput{ anchors.centerIn: parent source: player } }
报错
Starting /home/liang/study/13/03/build-Camera-unknown-Debug/Camera...
Warning: "No decoder available for type ‘video/x-h264, stream-format=(string)avc, alignment=(string)au, codec_data=(buffer)014d002affe10018674d002a963540f0044fcb37010101400001c2000057e40101000468ee3c80, level=(string)4.2, profile=(string)main, width=(int)1920, height=(int)1080, framerate=(fraction)25/1, interlace-mode=(string)progressive, chroma-format=(string)4:2:0, bit-depth-luma=(uint)8, bit-depth-chroma=(uint)8, parsed=(boolean)true‘."
Error: "Your GStreamer installation is missing a plug-in."
/home/liang/study/13/03/build-Camera-unknown-Debug/Camera exited with code 0
可以看出缺乏适配x-h264格式的解码器，报错缺少GStreamer插件，我在网上查找了很多资料不过很多都是基于ubuntu 14或者ubuntu 16平台下的，但解决方法不尽相同。一下便是我的解决方法
sudo add-apt-repository ppa:mc3man/gstffmpeg-keep
sudo apt-get update
sudo apt-get install gstreamer1.0-libav
sudo apt-get install gstreamer1.0-plugins-bad
sudo apt-get install gstreamer1.0-plugins-good
sudo apt-get install gstreamer1.0-plugins-base
sudo apt-get install gstreamer1.0-plugins-ugly
sudo apt-get install gstreamer1.0-qt5
sudo apt-get install gstreamer1.0-rtsp
QtQuick使用MediaPlayer抓取摄像头影响报错Error: "Your GStreamer installation is missing a plug-in."
原文：https://www.cnblogs.com/ohsolong/p/10651923.html