The film is being directed by Academy Award winner Alex Gibney
Frey has revealed to Billboard.com that the band are ramping up work on "The History of the Eagles," a two-DVD documentary.
"We've been doing our interviews," Frey reports. "We've interviewed 20, 30 different people, gotten every bit of footage we can -- especially from the 70s. We found Super 8 footage, photographs, interviews and stuff we didn't know we had. We're trying to get the project ready for release hopefully by the first of the year."
Frey reveals that they hired Gibney because "we wanted a great storyteller, someone who made visual, compelling films. Alex Gibney's work was every bit of that. And he was one of the directors on Martin Scorsese's seven-part series on the blues. He's really good."
Meanwhile, Frey released a brand new album of covers in the US this week.
After Hours features tracks ranging from the Great American Songbook to the staple "Route 66" and favorites by the Beach Boys ("Caroline No") and Randy Newman ("Same Girl").