Macbook Pro retina noise

I have just received a new macbook and I have started noticing this mechanical noise coming from the top centre. I have tested many things such as running black magic speed test- no noise; copying large amount of files, no noise! But when i start doing some video encoding i.e when the cpu start getting used up then I hear this noise coming along the loud fans.

Any idea what this could be?

https://dl.dropboxusercontent.com/u/56396311/New Recording.m4a