I just moved to my server to Centos7 and am having issues
Installation and Configuration
These docs are probably what you're looking for:
Docs: How ot use a different FFMPEG binary
https://www.jamroom.net/the-jamroom-network/documentation/howto/4641/howto-use-a-different-ffmpeg-binary
and
Docs: Advanced Config Keys
https://www.jamroom.net/the-jamroom-network/documentation/module-developer-guide/5106/advanced-config-keys
point jamroom to the location of those tools on your system.