Question

我正在尝试在documents目录中导出mp4文件。我正在从远程URL下载该文件，他们尝试对其进行修剪，并从现有文件中创建新的mp4。下面是我正在使用的代码的异常。这种方法适用于.mov文件和远程视频，但不适用于mp4。

func trimVideo(sourceURL: URL, startTime: Double, endTime: Double) {
 let fileManager = FileManager.default
 let documentDirectory = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]

 let asset = AVAsset(url: sourceURL)

 let fileName = UUID().uuidString + ".mp4"

 var outputURL = documentDirectory.appendingPathComponent("output")
 do {
   try fileManager.createDirectory(at: outputURL, withIntermediateDirectories: true, attributes: nil)
   outputURL = outputURL.appendingPathComponent(fileName)
 }catch let error {
   print(error)
 }

 //Remove existing file
 try? fileManager.removeItem(at: outputURL)

 guard let exportSession = AVAssetExportSession(asset: asset, presetName: AVAssetExportPreset640x480) else { return }
 exportSession.outputURL = outputURL
 exportSession.outputFileType = AVFileType.mp4
 let timeRange = CMTimeRange(start: CMTime(seconds: startTime, preferredTimescale: 1000),
                            end: CMTime(seconds: endTime, preferredTimescale: 1000))

 exportSession.timeRange = timeRange
 exportSession.exportAsynchronously {
   switch exportSession.status {
    case .completed:
      print(outputURL.absoluteString)
    case .failed:
      print("failed \(exportSession.error.debugDescription)")
    case .cancelled:
      print("cancelled \(exportSession.error.debugDescription)")
    default: break
    }
  }
}

失败可选（错误域= AVFoundationErrorDomain代码= -11800“操作无法完成” UserInfo = {NSUnderlyingError = 0x600003f432a0 {Error Domain = NSOSStatusErrorDomain Code = -16979“（null）”}），NSLocalizedFailureReason =发生未知错误（-16979），NSURL = PATH_TO_MY_FILE.mp4，NSLocalizedDescription =操作无法完成}）

Answer 1

从Victor的评论中得出自己的答案：

问题是我没有按以下方式创建通过fileURLWithPath传递的URL。让fileURL = URL（fileURLWithPath：filePath）

使用AVAssetExportSession快速导出MP4

1 个答案: