音视频都不能播放,
https://blog.csdn.net/liukang325/article/details/45025853
sudo add-apt-repository ppa:linuxuprising/libpng12
sudo apt update
sudo apt install libpng12-0
sudo apt install gstreamer1.0-libav ubuntu-restricted-extras
到这一步,音频出来了,视频还没出来,睡一觉起来再搞