Const. Babak Andalib-Goortani is charged with assault with a weapon over allegations excessive force was used against a protester at the G20 summit in 2010.
The charge was laid by Ontario's police watchdog, the Special Investigations Unit, after protester Adam Nobody was injured at a protest at the Ontario legislature on June 26, 2010.
An agreed statement of facts indicates that Nobody dropped a water bottle behind a police line and tests determined it contained ethanol, an ignitable liquid.
The trial was supposed to begin Monday, but as court began both the Crown and the defence said they needed time to review a video of the arrest that surfaced.
Defence lawyer Harry Black says the SIU has had the video since February 2011, but he and the Crown didn't get it until Friday.
A separate trial is set for next year for Andalib-Goortani, 30, on a second charge of assault with a weapon that was laid by Toronto police.
Last week the other Toronto police officer who faced criminal charges in the G20 protests was found not guilty of assault.
A judge ruled there wasn't enough evidence to prove beyond a reasonable doubt that Const. Glenn Weddell shoved and hit a protester.
Police came under intense criticism for their handling of protests that boiled over into violence and vandalism.
The vast majority of the more than 1,100 people detained in what Ontario Ombudsman Andre Marin called "the most massive compromise of civil liberties in Canadian history'' were released without charge.
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