What are your thoughts on the open source transport library SRT:
https://github.com/Haivision/srt/blob/master/docs/why-srt-was-created.md
which is integrated into OBS

https://obsproject.com/wiki/Streaming-With-SRT-Protocol
It has an open source server:
https://github.com/Edward-Wu/srt-live-server

If not using an existing CDN service and expecting many viewers, it
would be helpful to have a network of servers. I do not know about
typical bandwidth in Bangladesh, but standard videobridge setup
(https://github.com/jitsi/jitsi-videobridge) may be challenging to use
with many participants since all streams are relayed.

Is there any open source CDN software approved by FSF? Found the
following for building own CDNs, using Nginx (http://nginx.org/) or
Apache Traffic Server (http://trafficserver.apache.org/) :
https://info.varnish-software.com/blog/build-your-cdn-in-5-steps
https://www.nginx.com/blog/learn-to-stop-worrying-build-cdn/

https://www.comcasttechnologysolutions.com/blog/open-minds-open-source-open-cdns