rtMedia and its PRO version do come with a lot of functionality built within. I would suggest the following steps to get through:
1. Try rtMedia basic version and check how many of your problems get solved.
2. You can try ffmpeg add-on (https://rtcamp.com/store/rtmedia-ffmpeg/) which will convert audio/video on your server itself and also you use CDN to server it.
3. You can get in touch with rtCamp (who have developed and are continuously working on rtMedia, rtMedia PRO and other media add-ons) through the support forum (https://rtcamp.com/support/forum/rtmedia/) for the proper solution 🙂