In my humble opinion, you set up on the first rep as if you are about to perform a Stiff-Leg Deadlift. Your shoulders are in front of the bar and your hips are high.
Your subsequent reps are closer to what I would consider decent deadlift form. Some things I would change:
1. Start with your feet slightly further away from the bar. This will help get your shoulders behind the bar and get your hips lower when you begin the pull.
2. On the descent, bend over slightly more at the waist before bending the knees. This will keep you from hitting your knees with the bar on the way down. I'm not certain this is happening since the plates block the view, but it looks like it is occurring. Setting up with your feet/shins a bit further back might also cure this.
3. The lockout position at the top is the subject of some debate, but if it were me, I'd lean back just a little more. Don't bend backwards, but make sure your shoulders aren't rolled forward at lockout. Again, opinions will vary on this.