具体错误：
Package ffnvcodec was not found in the pkg-config search path. Perhaps you should add the directory containing `ffnvcodec.pc' to the PKG_CONFIG_PATH environment variable No package 'ffnvcodec' found
这是因为没有安装nv-codec-headers。具体参考：
具体错误：
Package ffnvcodec was not found in the pkg-config search path. Perhaps you should add the directory containing `ffnvcodec.pc' to the PKG_CONFIG_PATH environment variable No package 'ffnvcodec' found
这是因为没有安装nv-codec-headers。具体参考：
