Ticketing officer not present, other officer presents case

I recently argued my case in traffic court. The officer present was not the officer that wrote the ticket. The officer presented vascar calibration documentation and the dash cam from the car that the ticketing officer was driving. The officer even admitted that he was not the officer that wrote the ticket. When the vascar calibration was presented, the judge stated the evidence was accepted. He did not say this when the dash cam was presented. The judge found me guilty. Even though the dash cam was used as evidence, can I appeal my case based on the fact that the ticketing officer was not present? At the end of my hearing , the judge explained that I have 30 days to appeal my case for a trial de novo. Also, the judge was primarily looking at the officer during the hearing, and the two were smirking during my testimony. The judge was a police chief from a neighboring jurisdiction, and, according the clerk of court, the officer is the only officer that attends traffic hearings.