su - root rpm -ivh /home/red5/rpmbuild/RPMS/x86_64/ffmpeg-*.rpm
You can also build a more modern ffmpeg from source, but not all versions work. Version 3.1 is known to work - check out the release/3.1 branch and build from there. If your modern ffmpeg uses fdk_aac instead of libfaac, adjust the Matterhorn etc/encoding/avalon.properties accordingly.
Install and start the httpd service.