Reactor.Loop.Start();

var p1 = Reactor.Process.Process.Create(SC.GetAVS2PipeModPath(), string.Format("{0} \"{1}\" -wav", SC.GetAVS2PipeModPath(), filename + ".avs"));

var p2 = Reactor.Process.Process.Create(SC.GetOpusEncPath(), string.Format("{0} - \"{1}\"", SC.GetOpusSettings(true), filename + ".opus"));

p1.StdOut.OnData += (d) => p2.StdIn.Write(d);

p1.StdOut.OnEnd  += ()  => p2.StdIn.End()