Fixed it.

1) Close your application stream audio
2) Open the Control panel , Set HDMI output as default output in the "Sound" configuration.
3) Open the application and stream your audio again.

Thanks for the previous helpa nd replies in this thread, i did struggle for 5 to 10 mins , as i found my mp3 playing via hdmi but not the other application streaming..! finally discovered this thread !!!! thanks all...!

-Pradheep