Hi @s.u,
As noted in the documentation, this solution makes use of the Nginx RTMP module.
You can achieve adaptive bitrate functionality by making use of FFmpeg which the Kaltura platform relies heavily upon and is therefore included in our repos and deployed when installing Kaltura CE [package name is kaltura-ffmpeg].
This post includes sample configuration with which you can accomplish this. You can skip the “Setup Nginx and RTMP module” section altogether as all the needed prerequisites are already provided by the kaltura-nginx package and go right to the “Configuring nginx for live streaming” section.
When using the deb package, the config file to edit is /opt/kaltura/nginx/conf/nginx.conf, for RPM, it’s /etc/nginx/nginx.conf.