Note: The PHP-FFmpeg project has not been renewed for the last few years and is not compatible with the RHEL 8 based systems. Since code for alt-PHP-FFmpeg is outdated and FFmpeg has a lot of third-party dependencies, this module is not available for CloudLinux OS Shared 8.
Login has root on Ssh or login has root using whm and run the below command
yum install alt-php*ffmpeg
Enable PHP-FFmpeg extension via PHP Selector :
selectorctl --enable-extensions=ffmpeg --user USERNAME --version X.Y
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