Hi @OCX,
For RTMP playback, you can use the same URI as you do for streaming.
To wit: say this is the command you use to stream the content:
$ ffmpeg -re -i /path/to/mp4 -c copy -f flv rtmp://$NGINX_HOST:$NGINX_RTMP_PORT/kLive/my-stream
For testing RTMP playback, you can use ffplay:
$ ffplay rtmp://$NGINX_HOST:$NGINX_RTMP_PORT/kLive/my-stream
For HLS playback, you’d use:
$ ffplay http://$NGINX_HOST:$NGINX_HTTP_PORT/hlsme/my-stream.m3u8
Which, I believe you already figured out since you say HLS playback worked for you.
By default, when installing the kaltura-nginx package, $NGINX_HTTP_PORT is 88 [because with Kaltura CE 80 is already used for Apache] and $NGINX_RTMP_PORT is 1935 [default RTMP port].