atrpms is basically dead, yet we can still use its mirror to install stuffs by followings steps:
mkdir /root/rpm # you can put it at any other place
vim /root/rpm/RPM-GPG-KEY.atrpms
This we can get by simply google the file name, some github repo with the key will show up.
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.6 (GNU/Linux)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=23Fz
-----END PGP PUBLIC KEY BLOCK-----
vim /etc/yum.repos.d/atrpms.repo
[atrpms]
name=Fedora Core $releasever - $basearch - ATrpms
baseurl=https://www.mirrorservice.org/sites/dl.atrpms.net/el$releasever-$basearch/atrpms/stable # using a mirror
gpgkey=file:///root/rpm/RPM-GPG-KEY.atrpms # change this to location of RPM-GPG-KEY.atrpms
enabled=1
gpgcheck=1
This is the easy part:
sudo yum install ffmpeg