About the use  range of Multicast fusion?

“Multicast fusion”- My understanding is this:
It is just suitable for a company which is using a video meeting,and  for some clients those are outside the firewall, for more  bandwidth saving,the company should use "Multicast fusion" instead of "Mulitcast" only.
My company is a web site like youtube,for the "Large-scale Live broadcasts",whether  "Multicast fusion" is useless for us ?
I am making a report about "Multicast", for this question,ask for help ,thank you everybody
best wishes!

Nigel,Thanks a lot.right now i am more clearly.but i still have some problems:
The current situation is My Company is a videos share website(just like "youtube"),so   "Large-scale Live broadcasts" and “videos on demand”  are  the most concerned for us.
1  "Large-scale Live broadcasts" ,currently we are using fmle + fms ,but we are considering to use  p2p for more Cost-effective.whether fms is more suitable for us?
2 "videos on demand",we are using apache(http)+CDN,also we are considering to try to  use  p2p for more Cost-effective.for this case and also Because of many reasons,we won't turn to use rtmp/rtmfp, whether  the "Object Replication"  is the Main Solution in ActionScript?
Combination of the above situation ,do you have some suggest for us,such as what service(lccs,fms) should we to be using, that more Cost-effective and More suitable for us。
best whishes!

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