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Watch: Peter Jackson discusses the machine learning technology behind Now and Then

A 12-minute documentary provides insight into Now and Then's creation, and includes both archive and current-day footage

To mark the release of what’s being called the last song from The Beatles, the band has also unveiled a documentary about how the song was put together using 21st-century technology.

The documentary, directed by Oliver Murray with sound design by Alastair Sirkett, provides insight into Now and Then’s creation, and includes both archive and current-day footage.

It features an interview with director Peter Jackson, whose WingNut Films’ used MAL software to extract John Lennon’s voice from the original cassette recording.

“During the course of Get Back we were paying a lot of attention to the technical restoration,” explains Jackson.

“That ultimately led us to develop a technology which allows us to take any soundtrack and split all the different components into separate tracks based on machine learning.”