在这里找到一个是USB的，不知道能不能按照这个办法安装？
https://blog.csdn.net/qq_43591363/article/details/107850324?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522171145713016800227415046%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=171145713016800227415046&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduend~default-1-107850324-null-null.142^v100^control&utm_term=树莓派4B rtsp&spm=1018.2226.3001.4187