Yet without her video there would have been NO CONTEXT at all and in a "cop's word vs citizen's word" situation we all know who the judge tends to believe.
I don't believe there is evidence even on the tape that she said anything to the officer who arrested her before she started filming. It's just as likely that she was talking to the people accompanying her and the officer simply heard what he wanted to hear and assumed she was talking to him.
Fortunately "innocent until proven guilty" still largely reigns in this country though we'll probably never hear what the result of the "internal investigation" is.