Greg Farmer, 25, who has been protesting since Mr. Scott’s death, said on Saturday that even if Mr. Scott did have marijuana and a gun, the police should not have killed him.

“Even if they thought he was smoking weed, why in any world would that warrant him being gunned down?” said Mr. Farmer, who owns a food truck and a handyman business in Charlotte.

The protesters, who have taken to the streets since Tuesday in large numbers — sometimes peacefully and sometimes not — have made “Release the Tapes” a signature chant and most pointed demand, and have accused Chief Putney of obscuring the details of the shooting.

And yet, for a number of reasons, it seems likely that the release of the two videos, and the new information about the case, will do little to quell what has become a roiling national debate over whether it was necessary to fatally shoot Mr. Scott, one of a number of African-American men who have died at the hands of police officers in recent months.

The frustration and anger was evident before Chief Putney had finished his news conference, which protesters were listening to on a loudspeaker at a park in the Uptown area of Charlotte.

Around 4:30 p.m., a protester announced to some cheers that there had been an update about the release of the police videos.

Image Keith Lamont Scott

But that cautious optimism turned to anger about 10 minutes later as protesters learned the police would not be releasing all of the video footage. Chief Putney said that while the information being released constituted “the most complete puzzle that we can without trying the case out in public,” he said that some unreleased videos showed only people driving to the scene. He also said that more footage would be released upon completion of an independent inquiry being conducted by the State Bureau of Investigation “and there has been a definitive decision on the part of the prosecutor.”

The mood among the protesters fell.

“Everybody take a deep breath. So basically Chief Putney is saying that they are not releasing the full videos of Keith L. Scott,” Tamika Lewis, 27, one of the protest organizers, said as many others booed and shook their heads. “Our demand clearly states to release the full video, the names and the reports that are related to the shooting. This is a slap in the face. He’s like, ‘Oh, I’m going to give them a little bit of what they want, and then they’re going to go away.’ No. We will occupy the streets of Charlotte until they release the full videos.”

The chief, as well as other officials in North Carolina, had previously resisted demands to release the footage because they said it could undercut the investigation by the state, which is reviewing the shooting at the request of Mr. Scott’s family.

But by Saturday afternoon, word had begun to spread through Charlotte that the chief had agreed to release the footage. During a news conference at a West Charlotte police station, as rifle-bearing members of the National Guard stood outside, the chief insisted that his decision had not been influenced by political pressure, nor by the release on Friday of a video recorded by Mr. Scott’s wife.

The chief said he believed that disclosing some of the state’s evidence would not “taint” the state’s inquiry.

“The footage itself will not create, in anyone’s mind, absolute certainty as to what this case represents, and what the outcome should be,” he said. “The footage only supports all of the other information — physical evidence, the statements from witnesses and officers and all of the other information, scientific and physical — that create an entire picture.”