Paris-Match does not own the video that it posted on its website on Tuesday, journalist Frédéric Helbert said on Wednesday.
German tabloid Bild also posted the video.
"The scene was so chaotic that it was hard to identify people, but the sounds of the screaming passengers made it perfectly clear that they were aware of what was about to happen to them," Paris-Match reported. "One can hear cries of 'My God' in several languages."
After initially denying that the video could be authentic, police called anyone in possession of video to hand it over to the investigators.
Although the video was filmed by "a passenger filming from the back of the plane", it "adds nothing to the inquiry", Helbert said.
The magazine said the footage came from a mobile phone "found among the wreckage by a source close to the investigation".
Lufthansa boss Carsten Spohr and Germanwings chief Thomas Winkelmann visited a memorial to the 150 victims in the French Alpine town of Le Vernet on Wednesday.
"I give my world the victims' families, our assistance will not stop this week," Spohr said. "We will continue to give help as long as necessary."
He thanked the police, soldiers and medical staff who have worked on the site.
On Tuesday the gendarmerie said there were no more body parts on the site and that the search for possessions and the second flight recorder continued.