I'm currently using DirextX, never used MDX. A wealth of examples exist on the net but fine tuning it is turning out to be a bit tricky without some in depth knowledge. Switching between chip-sets on video capture cards, for example, will produce funky behavior when streaming. Not to mention accessing different properties pages on different video capture cards. I'm currently streaming at 320,240, the most immediate need to jump that resolution up to 640, 480 (and beyond). Again, i've figured out how to do it, but it's buggy due to my limited knowledge of DirectX (I randomly get the blue screen of death). I figured it was simply time to jump in and become a DirecX programmer and was looking for a good jumping off point, but not one that is gaming related.