Apparently, the Ferguson Police Chief released this video in the hopes of discrediting Brown. It worked with those who were already inclined to believe that the police officer was justified in his actions as judge, jury and prosecutor/executor.
BUT, it really doesn't matter what Brown's past violations (if any) were. The fact remains that the officer shot and killed an unarmed person and he shot at least seven times. Either he was a very poor shooter, or he intended not just to wound Brown, but to kill him.