質問編集履歴
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下記のような実装でアプリを実行すると、ドキュメントフォルダに、動画ファイルが生成されません。exportを消してみれば、、ドキュメントフォルダに、動画ファイルが生成され正常に動きます。
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# 実装
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```swift
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//動画トリミング
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func createAudioFileFromAsset(_ asset: AVAsset){
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// ロゴのCALayerの作成
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let logoImage: UIImage = UIImage(named: "iwk.jpg")!
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let logoLayer: CALayer = CALayer()
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logoLayer.contents = logoImage.cgImage
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logoLayer.opacity = 0.9
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// 親レイヤーを作成
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let parentLayer: CALayer = CALayer()
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parentLayer.frame = CGRect(x: 0, y: 0, width: 100, height: 100)
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parentLayer.addSublayer(logoLayer)
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// 合成用コンポジション作成
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let videoComp: AVMutableVideoComposition = AVMutableVideoComposition()
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let videoSize: CGSize = videoAssetSourceTrack.naturalSize
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videoComp.renderSize = videoSize
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videoComp.frameDuration = CMTimeMake(1, 30)
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videoComp.animationTool = AVVideoCompositionCoreAnimationTool.init(postProcessingAsVideoLayer: parentLayer, in: parentLayer)
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// インストラクション作成
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let instruction: AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
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instruction.timeRange = CMTimeRangeMake(kCMTimeZero, comp.duration)
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let layerInstruction: AVMutableVideoCompositionLayerInstruction = AVMutableVideoCompositionLayerInstruction.init(assetTrack: videoAssetSourceTrack)
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instruction.layerInstructions = [layerInstruction]
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// インストラクションを合成用コンポジションに設定
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videoComp.instructions = [instruction]
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let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] as URL
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let filePath = documentsDirectory.appendingPathComponent("rendered-audio.m4v")
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//filePath.videoAssetTrack.naturalSize = 320.0
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if let exportSession = AVAssetExportSession(asset: asset, presetName: AVAssetExportPreset640x480){
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//exportSession.naturalSize.preferredTransform = 320.0
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exportSession.canPerformMultiplePassesOverSourceMediaData = true
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exportSession.outputURL = filePath
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exportSession.timeRange = CMTimeRangeMake(kCMTimeZero, asset.duration)
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exportSession.outputFileType = AVFileTypeQuickTimeMovie
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//exportSession.videoComposition = videoComp
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exportSession.exportAsynchronously {
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_ in
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print("finished: \(filePath) : \(exportSession.status.rawValue) ")
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}
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}
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}
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```
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