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A sprawling body of visual evidence, made possible by inexpensive, lightweight cameras in the hands of private citizens, volunteer observers and the police themselves, has shifted the debate over precisely what happened on the streets during the week of the convention.

For Mr. Kyne and 400 others arrested that week, video recordings provided evidence that they had not committed a crime or that the charges against them could not be proved, according to defense lawyers and prosecutors.

Among them was Alexander Dunlop, who said he was arrested while going to pick up sushi.

Last week, he discovered that there were two versions of the same police tape: the one that was to be used as evidence in his trial had been edited at two spots, removing images that showed Mr. Dunlop behaving peacefully. When a volunteer film archivist found a more complete version of the tape and gave it to Mr. Dunlop's lawyer, prosecutors immediately dropped the charges and said that a technician had cut the material by mistake.

Seven months after the convention at Madison Square Garden, criminal charges have fallen against all but a handful of people arrested that week. Of the 1,670 cases that have run their full course, 91 percent ended with the charges dismissed or with a verdict of not guilty after trial. Many were dropped without any finding of wrongdoing, but also without any serious inquiry into the circumstances of the arrests, with the Manhattan district attorney's office agreeing that the cases should be "adjourned in contemplation of dismissal."

So far, 162 defendants have either pleaded guilty or were convicted after trial, and videotapes that bolstered the prosecution's case played a role in at least some of those cases, although prosecutors could not provide details.

Besides offering little support or actually undercutting the prosecution of most of the people arrested, the videotapes also highlight another substantial piece of the historical record: the Police Department's tactics in controlling the demonstrations, parades and rallies of hundreds of thousands of people were largely free of explicit violence.

Throughout the convention week and afterward, Mayor Michael R. Bloomberg said that the police issued clear warnings about blocking streets or sidewalks, and that officers moved to arrest only those who defied them. In the view of many activists - and of many people who maintain that they were passers-by and were swept into dragnets indiscriminately thrown over large groups - the police strategy appeared to be designed to sweep them off the streets on technical grounds as a show of force.

"The police develop a narrative, the defendant has a different story, and the question becomes, how do you resolve it?" said Eileen Clancy, a member of I-Witness Video, a project that assembled hundreds of videotapes shot during the convention by volunteers for use by defense lawyers.