Very interesting, seeing that it is in Erlang also inspires confidence. I've been using another Erlang product recently, RabbitMQ, and the way you can just throw thousands upon thousands of messages on it, under heavy load, and it always delivers, no errors, no problems, amazes me.

Is it possible to write a plugin that would stream audio not from a file but from some other source like a Unix socket, UDP socket, or a shared memory circular buffer?

Would that plugin be bound by GPL as well?

This is a great project. It also does RTSP and M2TS/Apple Live Streaming.