It works. I hear audio - just I never see the little red light show the codec on the front of my onkyo - like I do with AC3/DTS passthrough (non HD). Also the HDMI light blinks, which I think is a sort of indication of syncing?
Also, only -D hdmitest3 works - which I think makes sense as 2,9 was the only device that ever worked for me.
Awesome work! I can't wait for this to get integrated to ffmpeg so that I can bug the myth devs to sync ffmpeg into myth.