Can I obtain dash cam footage before my court date?

My arresting officer charged me with delaying an investigation which he just made up because I exercised my right to free speech when he commanded me to keep walking which he did not like. I always maintained 15 to 20 foot distance from him as well as being separated by an eight foot barrier rendering me physically incapable of approaching him which he claimed I had done in his report. The dash cam footage of a second arriving officer showed my position relative to arresting officer proving that I said my piece and continued walking. This footage would prove my arresting officer lied under penalty of perjury. When detained by second officer, I questioned him as to why I was being detained, if I was under arrest, what crime I had committed, and if I was free to go but received no answer as well as both officers refusing to relinquish their badge numbers.