Your knees are traveling forward for the duration of the movement, which may be aggravating your hips, if the pain is near your rectus femoris origin. However, if it is bursitis, that kinda sucks. Wanna know what cures bursitis? I would like to know and so would everyone else. That can be a tough thing to shake, if it is what you have. Here is what I can tell you. Make your stance a little wider. Get your knees in place by half way down and don't let them go further forward thereafter. Get some lifting shoes. Otherwise, your squat looks pretty good.