A paedophile who worked in film and television has been jailed after he "manipulated children into gratifying his sexual desires".
The 63-year-old had pleaded guilty to 14 offences against four young victims aged between seven and 13, at an earlier hearing.
The assaults had been carried out on two boys and girls between May 1980 and August 1991.
The court heard how some of the vile attacks took place in Brixton.
He admitted eight counts of indecent assault, and six counts of indecency with a child.
Trainer, a film special effects artist and photographer, had worked on children's film The NeverEnding Story and Little Shop of Horrors.
Prosecutor Leo Seelig said: "Between 1980 and the early 1990s, David Trainer perpetrated a campaign of predatory sexual abuse upon young children."
He said one victim described Trainer as being "like the pied piper", while another called him a "charismatic bubbly man who paid a lot of attention to children".
He would encourage his victims not to tell anyone, the court heard.
His victims came forward following a separate trial in 2011 when he was jailed after being found guilty of nine counts of historical indecent assaults against four young girls.
CPS reviewing lawyer, Varinder Hayre, said: "David Trainer worked as a technician in television and on well-known films as well as a photographer when he manipulated these children into gratifying his sexual desires.
"He abused the trust of these children and their parents to damage lives.
"These guilty pleas will spare those victims from having to attend a trial and we thank them for supporting this prosecution."
DI Angela Craggs of the Met's Child Abuse and Sexual Offences Command said: “David Trainer preyed on and abused young children, and exploited the trust placed in him by the parents of the victims in the worst way possible.
“The victims in this case have been waiting for justice for decades, and it was Trainer’s previous conviction for similar offences which gave them the courage to come forward and report their ordeals at the hands of Trainer.
“This case sends out a strong message that the Metropolitan Police will listen to victims and investigate historical abuse allegations, and the passage of time is not a barrier to bringing the people responsible to justice.
“I would like to pay tribute to the victims in this case who have shown remarkable strength in recounting the abuse they suffered to ensure that Trainer was punished for what he did. It is possible that there are yet more victims, and we would urge them to contact us - we will support you and treat any information you give us with the strictest confidence."
To report any offences committed by Trainer, call the Child Abuse Investigation Team at Lambeth on 020 7232 6344.
Keep up to date with the latest news in west London via the free getwestlondon app.
You can set up your app to see all the latest news and events from your area, plus receive push notifications for breaking news.