[CyberFonic]

I invested 2 minutes of my time and found:

https://aws.amazon.com/solutions/live-streaming-on-aws/

and

https://aws.amazon.com/mediaconvert/pricing/

Assuming you trial a MVP using AWS those two pages might give you some indication of ball park costs.

If you are looking at co-lo provisioning then you will probably need to plunk down in the order of USD10,000 to USD50,000 to test the waters.

Either way, in the long term I think your per minute per connection costs will probably be in the order of the AWS costings. After all, they do that sort of thing on a massive scale and have a great deal of experience.

Good luck with your planned venture.