在ubuntu用yolo识别gstreamer

先装ubuntu，ubuntu20.04可以避免Python2的烦恼

使用鱼香ros一键 roswget http://fishros.com/install -O fishros && . fishros

源码编译opencv：

1.装gstreamer

sudo apt update
sudo apt install -y libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgstreamer-plugins-bad1.0-dev libgstreamer-plugins-good1.0-dev
sudo apt install -y gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly
sudo apt install -y gstreamer1.0-tools gstreamer1.0-libav
sudo apt install -y gstreamer1.0-doc gstreamer1.0-x gstreamer1.0-alsa gstreamer1.0-gl gstreamer1.0-gtk3 gstreamer1.0-qt5 gstreamer1.0-pulseaudio

2.下载opencv源码

下载gtk3，防止gtk3冲突

sudo apt-get update

sudo apt-get install libgtk-3-dev

下载egin3

sudo apt install libeigen3-dev

2.已安装或者安装完还是报这个错误，可以修改源码中eigen的路径

转到文件~/opencv-4.1.1/modules/core/include/opencv2/core/private.hpp，修改其中 # include <Eigen/Core>为 # include <eigen3/Eigen/Core>，然后再重新编译。

编译opencv

mkdir build
cd build
cmake -D WITH_GTK_3_X=ON  -D OPENCV_GENERATE_PKGCONFIG=YES ..
make -j4
sudo make install

由于是opencv4.1.1，可能会优先使用高版本的opencv，可以

pip3 list查看pip列表再用pip3 uninstall 库名 来卸载掉他