A mi me parece que
esto cumple con todos tus requisitos, échale un vistazo a ver que piensas.
Live Streaming key features:
+ 1 to many 1 way video streaming
+ Live chat for viewers
+ User list with online participants
+ Channel title
+ HTML embed code to publish video channel
+ P2P group streaming support
+ Session timer and control with scripts
+ 100% web based for clients