Hi there!My goal is to trim audio quite precisely. I'm facing some strange issue when exporting it using AVAssetExportSession.The code is pretty straightforward.import UIKit import AVFoundation import PlaygroundSupport let asset: AVURLAsset = AVURLAsset(url: Bundle.main.url(forResource: "tmp", withExtension: "aac")!) print(asset) let timeRange = CMTimeRange( start: CMTime(seconds: 20.0, preferredTimescale: asset.duration.timescale), end: CMTime(seconds: 25.0, preferredTimescale: asset.duration.timescale) ) let exportSession = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetPassthrough)! exportSession.outputFileType = .m4a let fm = FileManager.default let tmpDirURL = FileManager.default.temporaryDirectory.appendingPathComponent("cut.m4a") try? fm.removeItem(at: tmpDirURL) exportSession.outputURL = tmpDirURL print(tmpDirURL) exportSession.timeRange = timeRange exportSession.exportAsynchronously { switch exportSession.status { case .completed: print("completed") default: print("exportSession: \(exportSession.error?.localizedDescription ?? "error")") } }When I started analyzing results in the Audacity, I see that file is trimmed with some error which is very critical.If I align it by peaks (on the eye) I see ~500 ms error in this particular case. Error varies and repeats for different files I've tried.I've tried it with AVMutableComposition. Same result.Maybe I'm doing something wrong? Or am I missing something? I want files to be cut exactly by the time I set timeRange property of AVAssetExportSession.