Those lifts were nearly silent. Youtube some Olympic snatches and listen, they literally are humping the bar and banging it off high upper thigh/pelvic bone area. Like the above post mentioned, looks like you are just throwing it up with a shrug and arms.
Think that you arms are just cables and not there to really pull the weight but to hold on to it. You'll know when you hit a snatch correctly because the bar hauls ass vertically and thats when you quickly done under and lock it out.