What kind of s**thole town is it that the cops would treat you like that? Fact is that most cops get paid jack and are not very educated. In my area they get paid under $25000 per year so that tell you something.
As I think about it more, I think that you should talk with an attorney and see about providing that video in a court case against him. These guys rarely act like that with one woman. He has probably done it before and will do it again. You have been smart enough to get out. Maybe your video will help get him the help and enforcement he needs to get better. Maybe it will keep you safer. Talk to the DV (domestic violence) department at the courts and hear their advice. We are rooting for you!