I dont understand where the source lies. I currently have an external HDD connected my my mac mini. I then have the mac mini wirelessly stream to the appletv. My regular video content works just fine. However, my HD content stutters, if you will, and is very choppy. I don't understand why. I have the most updated firmware for the appletv. If i have the hd content on the HDD of the appletv, it works perfectly fine. No problems whatsoever. What can I do to correct this?