Here’s a video of LPD8806 getting the data from the visuals.
It’s an Arduino Mega2560, you can see on the outer ones it’s glitching a bit. Could be a bug, but I think more likely it’s reaching the limit of DMX data the arduino can process. Still a work in progress…
http://www.youtube.com/watch?v=lMnJ2I1GJuY
I’m just curious as to why you have chosen a Mega as opposed to the Due for an install like this, wouldn’t you benefit from a faster processor? Great job by the way!
The actual reason: I pulled it together in a few hours and didn’t have a Due handy. 
Although it was actually quite seemless when I was controlling the LEDs over Art-Net with a Road Hog 4 lighting desk, when we tested it beforehand. It was only when I started controlling them with MadMapper did the glitchy-ness occur, and our visuals guy wasn’t available to test until we were on site. I think MadMapper sends out the Art-Net data much faster than the lighting desk, too fast for it to process. Originally the one controller was handling 6 Art-Net universes, it was really bad, so I reduced it to 2, and made each side mirror each other, not ideal but when you’re in the middle of nowhere there isn’t much else to do. 
But in the future I will use a Due or a Teensy with ethernet shield.