centos7 repo and yum

 1. centos 7 all repo

https://pkgs.org/

2. install by rpm  

http://glidingphenomena.blogspot.com/2020/02/how-to-fix-error-requires.html

3.  remove pid

[root@localhost yum.repos.d]# rm -rf /var/run/yum.pid

4. yum instruct

yum info 

rpm -ql 

5. extract package

[root@localhost ffplay_test]# rpm2cpio ffplay-2.8-4.el7.centos.x86_64.rpm | cpio -idmv