1.docker hub
2.csdn
3.keil c51
4.python downloads
https://www.python.org/downloads/
5.gstreamer download
https://gstreamer.freedesktop.org/download/
6.ffmpeg
https://ffmpeg.org/
https://ffmpeg.org/releases/
7.unbuntu清华镜像源
https://mirror.tuna.tsinghua.edu.cn/help/ubuntu/