A gay rights campaigner has pleaded not guilty to charges of assaulting police and resisting arrest at last month’s Sydney Mardi Gras.

ABC News reports Bryn Hutchinson, 32, claims he was the victim of excessive and unlawful police force.

Mr Hutchinson’s lawyer Peter O’Brien called on anyone with footage of the incident to come forward.

“We’ve called for and subpoenaed as much footage as we see might be publicly available,” he said.

“Obviously there may have been people who were there, who haven’t come forward to police or to us, and we make a call for any media that might have been present or any filming that might have been done by participants of the Mardi Gras or spectators of the Mardi Gras.”

In March, video footage emerged of alleged police violence at the event.

New South Wales Police subsequently launched several investigations into allegations of police misconduct.