metatext-app-ios-iphone-ipad/Extensions/AVURLAsset+Extensions.swift

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2021-01-18 07:03:32 +01:00
// Copyright © 2021 Metabolist. All rights reserved.
import AVFoundation
enum AssetExportError: Error {
case exportSetup
case export
}
extension AVURLAsset {
func exportWithoutAudioTrack(completion: @escaping ((Result<URL, AssetExportError>) -> Void)) {
let composition = AVMutableComposition()
let exportDirectory = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString)
guard let sourceVideoTrack = tracks(withMediaType: .video).first,
let compositionVideoTrack = composition.addMutableTrack(
withMediaType: .video,
preferredTrackID: kCMPersistentTrackID_Invalid),
case .success = Result(catching: {
try compositionVideoTrack.insertTimeRange(
CMTimeRange(start: .zero, duration: duration),
of: sourceVideoTrack, at: .zero)
}),
let exportSession = AVAssetExportSession(
asset: composition,
presetName: AVAssetExportPresetHighestQuality),
exportSession.supportedFileTypes.contains(.mp4),
case .success = Result(catching: {
try FileManager.default.createDirectory(
at: exportDirectory,
withIntermediateDirectories: false)
})
else {
completion(.failure(.exportSetup))
return
}
let exportURL = exportDirectory.appendingPathComponent(url.lastPathComponent)
exportSession.outputFileType = AVFileType.mp4
exportSession.outputURL = exportURL
exportSession.timeRange = CMTimeRange(start: .zero, duration: duration)
exportSession.exportAsynchronously {
guard exportSession.status == .completed else {
completion(.failure(.export))
return
}
completion(.success(exportURL))
}
}
}