If you want to install FFmpeg on your server you can check the following links:

How to install ffmpeg on Centos 7:
https://linuxize.com/post/how-to-install-ffmpeg-on-centos-7/

How to install ffmpeg on Centos 8:
https://linuxize.com/post/how-to-install-ffmpeg-on-centos-8/

How to install ffmpeg on Ubuntu:
https://linuxize.com/post/how-to-install-ffmpeg-on-ubuntu-18-04/

How to install ffmpeg on debian:
https://linuxize.com/post/how-to-install-ffmpeg-on-debian-9/

Also you can back to your server admin or hosting support to install it for you.

Note: Don’t forget to enable shell_exec PHP function.

That’s it.

Happy Sngine 🙂

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