@OCX If you are streaming directly with RTMP to Kaltura CE through NGINX then you should be fine dropping your use of Wowza. However, if you have a need to stream from alternate sources like IP cameras and sources with variable bit rates based on current bandwidth or that require connectivity checks to insure the stream is still live and does not need to be refreshed or re-established then I would recommend you keep an active Wowza license.
It is my opinion that if you are not skilled enough to create a script to work with NGINX and know how to configure NGINX manually to handle RTSP and other variable streams then Wowza is a must have to pair with Kaltura CE at this point in it’s development. I have not been able to establish a constant uninterrupted stream IP camera stream with Kaltura CE and have found the need to restart the stream occasionally to keep the stream active.
However, my RTMP streams ran from thrid party software to Kaltura CE work fine. I assmue this is cause the thirdy party software keeps the stream alive.