I was trying to generate a signature from an audio file on-disk. Loading the files work, however generating signatures from them don't seem to work. Here's the code I'm using to generate the signature: func signature(from asset: AVAudioFile) -> SHSignature? {     let format = asset.processingFormat     let frameCount = AVAudioFrameCount(asset.length)           guard let buffer = AVAudioPCMBuffer(pcmFormat: format, frameCapacity: frameCount) else { return nil }     let generator = SHSignatureGenerator()           do {        try asset.read(into: buffer)                let sampleRate = asset.processingFormat.sampleRate                try generator.append(buffer, at: AVAudioTime(sampleTime: .zero, atRate: sampleRate))                return generator.signature()     } catch {        print(error)        return nil     } } There are no errors being thrown in the code, but when I try to use the signatures in an SHSession, the audio is not being recognised. However, using the Shazam library works. I have tried searching ways to do this, however the only examples I've seen are for generating signatures from live audio input. Is there something I'm missing from the code above?