A police inspector has pleaded guilty to making and distributing hundreds of indecent images of children, including a boy aged six.
Lee Bartram also filmed a sunbathing teenager while he was on bail, Walsall Magistrates' Court was told.
Bartram, who worked in Birmingham city centre, admitted five counts of making indecent images of a child and two counts of distributing similar images.
The charges relate to a period between August 2013 and this month, and cover a total of 328 images, including some found on an iPad and an iPhone.
In one of the films, Bartram was heard "blaming the parents" for the way a child was dressed.
Other films had a commentary from Bartram about "what he would like to do" with the children, prosecutor Mark
Cooper said.
Bartram is at risk of suicide and poses a threat of committing further offences, the prosecution said.
Bartram's lawyer disputed prosecutors' claims that a 15-year-old boy had been filmed sunbathing after Bartram had been arrested, saying the footage was recorded last year.
But Judge Graham Wilkinson told Bartram: "You will know better than most that when dealing with bail I take the crown's case at its strongest.
"It is the crown's case that the videoing happened while you were subject to police bail.
"Whilst on bail you have continued to show an interest in under-age children for sexual gratification. I have no option but to remand you in custody."
Bartram should be treated as the "most vulnerable" class of inmate while in prison custody, the magistrate said.
His address is not being published as it could lead to him or his family being "targeted by terrorists for the most
serious acts of violence", the judge said.
Assistant Chief Constable of West Midlands Police, Gareth Cann, wrote to the court asking the judge to take into consideration the current "severe" terror threat rating.
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"Should you feel able to direct that an address can be withheld, taking into account all the circumstances of the case before you, then you would be making a valuable contribution to mitigating the current threat we face," his letter said.
Bartram will be sentenced at Wolverhampton Crown Court on 13 September.
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