1968,
First things first. Next time you videotape your deads, try backing the camera up a bit more so we can see the plates. It's tough to see when the bar breaks the floor.
That being said, the pull looks pretty good but you have one obvious flaw, and it's a common one. Your hips rise too much before the pull actually begins, which leads to lack of tightness and wasted energy.
This is your position when you start the pull:
This is your position when the bar breaks the floor:
See that grey line at the bottom of the images? That's from youtube and hasn't moved between images. Use this line as a reference to see how far your hips have risen before the pull actually begins. That's not good. Ideally, your hips won't move from the time you finish your setup to the time the bar breaks the floor. Like I said above, that movement results in loose hamstrings and wasted energy.
Next time you deadlift, try getting in the 2nd position to begin with. Try getting into this position by shoving your hips/butt backwards until you can reach the bar. You should feel some tightness in your hamstrings. This tightness can be used to spring the bar off the floor.