Ok. Well I watched it several times. As usual as I go back and watch it more I might notice other things.
Probably you will benefit just as much by doing certain things besides the actual squatting itself.
It seems like you defenitely need to work on mobility and ROM. Probably lower back, hip flexor, and ham stretching after your workout will help as far as lengthening the muslces and maybe some dynamic stretching before you workout. The good thing about dynamic stretching is it can get the muscle a little more pliable but also it is in the realm of mobility work so it can loosen up any tight joints like the ankles.
Also, I don't know if you are doing this or if it is just the way you are, but don't overexagerate the lower back arch. Go for a neutrual or "natural" back. In other words tighten up the arch you already have. Engage the glutes during this.
Are you using the valsalva technique?
Now for the actual squats you are breaking parallel consistently. But you tend to drop you shoulders down at the end. Some of the time you are practically folded in half! That must be tough to get out of. I can't tell for sure why you are doing this. My gut is that you are trying to compensate for the feeling of not going deep enough so you bring your shoulders down to get this illusion of depth. (I used to do that so I know what I'm talking about). What matters is where you butt is. You need to concentrate on keeping your upper back and shoulders back. I could be wrong about the reason you are doing that. It could be a correction for the bar being out of line. I can't tell. The bar should basically stay on a line with the midline (give or take) of your feet.
I think perhaps you may benefit from box squatting 3 or 4 inches below parallel so you can work on that while also keeping the lower back from rounding under. You can do speed work with that, btw, but I would recommend getting used to the box squatting before you try to do it fast.
Also some work with the load in the front may help you learn to stay a bit more upright. I like to do front loaded plate squats...you squat with a plate held out in front of you (high reps).
For the rest of it read this:
http://www.bodybuilding.net/44452-132-post.html