Swift - 如何使用UIImagePickerController以MP4格式录制视频？

我正在创建一个应用程序，我需要记录视频并将其上传到服务器。现在我的项目也有一个android版本。为了支持Android版本，我必须以mp4格式录制视频。我跟着this教程设置UIImagePicker媒体类型电影格式imagePicker.mediaTypes = [kUTTypeMovie as String]Swift - 如何使用UIImagePickerController以MP4格式录制视频？

的UIImagePickerController非常适合我的要求，我需要改变是它保存格式为MP4的唯一的事情。我在mediaTypes中试过kUTTypeMPEG4，但它在运行时抛出错误，没有错误描述。

这是我的视频拍摄功能

func startCameraFromViewController() { 

     if UIImagePickerController.isSourceTypeAvailable(.Camera) == false { 
      return 
     } 
     viewBlack.hidden = false 
     presentViewController(cameraController, animated: false, completion: nil) 

     cameraController.sourceType = .Camera 

     cameraController.mediaTypes = [kUTTypeMovie as String] 
     //cameraController.mediaTypes = [kUTTypeMPEG4 as String] 
     cameraController.cameraCaptureMode = .Video 
     cameraController.videoQuality = .TypeMedium 
     if(getPurchaseId() as! Int == 0) 
     { 
      if(txtBenchMark.text?.isEmpty == false) 
      { 
       cameraController.videoMaximumDuration = NSTimeInterval(300.0) 
      }else{ 
       cameraController.videoMaximumDuration = NSTimeInterval(60.0) 
      } 
     }else{ 
      cameraController.videoMaximumDuration = NSTimeInterval(600.0) 
     } 
     cameraController.allowsEditing = false 
    }

我使用雨燕2.2和Xcode中8 Use Legacy swift Language version = Yes

任何替代方案也很受青睐。提前致谢。

编辑：我发现，没有办法直接录制mp4格式的视频在swift中。只能从苹果的quicktime mov格式转换为所需的格式。

来源

2016-11-01 Kautham Murugan

下面是一些代码，你可以用它来录制的视频转换成MP4：

func encodeVideo(videoURL: NSURL) { 
let avAsset = AVURLAsset(URL: videoURL, options: nil) 

var startDate = NSDate() 

//Create Export session 
exportSession = AVAssetExportSession(asset: avAsset, presetName: AVAssetExportPresetPassthrough) 

// exportSession = AVAssetExportSession(asset: composition, presetName: mp4Quality) 
//Creating temp path to save the converted video 


let documentsDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] 
let myDocumentPath = NSURL(fileURLWithPath: documentsDirectory).URLByAppendingPathComponent("temp.mp4").absoluteString 
let url = NSURL(fileURLWithPath: myDocumentPath) 

let documentsDirectory2 = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0] as NSURL 

let filePath = documentsDirectory2.URLByAppendingPathComponent("rendered-Video.mp4") 
deleteFile(filePath) 

//Check if the file already exists then remove the previous file 
if NSFileManager.defaultManager().fileExistsAtPath(myDocumentPath) { 
    do { 
     try NSFileManager.defaultManager().removeItemAtPath(myDocumentPath) 
    } 
    catch let error { 
     print(error) 
    } 
} 

url 

exportSession!.outputURL = filePath 
exportSession!.outputFileType = AVFileTypeMPEG4 
exportSession!.shouldOptimizeForNetworkUse = true 
var start = CMTimeMakeWithSeconds(0.0, 0) 
var range = CMTimeRangeMake(start, avAsset.duration) 
exportSession.timeRange = range 

exportSession!.exportAsynchronouslyWithCompletionHandler({() -> Void in 
    switch self.exportSession!.status { 
    case .Failed: 
     print("%@",self.exportSession?.error) 
    case .Cancelled: 
     print("Export canceled") 
    case .Completed: 
     //Video conversion finished 
     var endDate = NSDate() 

     var time = endDate.timeIntervalSinceDate(startDate) 
     print(time) 
     print("Successful!") 
     print(self.exportSession.outputURL) 

    default: 
     break 
    } 

}) 


} 

func deleteFile(filePath:NSURL) { 
guard NSFileManager.defaultManager().fileExistsAtPath(filePath.path!) else { 
    return 
} 

do { 
    try NSFileManager.defaultManager().removeItemAtPath(filePath.path!) 
}catch{ 
    fatalError("Unable to delete file: \(error) : \(__FUNCTION__).") 
} 
}

来源：https://stackoverflow.com/a/39329155/4786204

来源

2016-11-01 06:09:33

感谢您的代码。我会尝试。但你知道我可以直接以mp4格式从相机录制视频吗？ –

我不相信用户界面图像选择器是可能的。 –

感谢您的帮助朋友。我会尝试上面的代码。 –

我做了一些修改，下面的2个答案，使其与Swift3兼容：
https://stackoverflow.com/a/40354948/2470084
https://stackoverflow.com/a/39329155/2470084

import AVFoundation 

func encodeVideo(videoURL: URL){ 
    let avAsset = AVURLAsset(url: videoURL) 
    let startDate = Date() 
    let exportSession = AVAssetExportSession(asset: avAsset, presetName: AVAssetExportPresetPassthrough) 

    let docDir = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] 
    let myDocPath = NSURL(fileURLWithPath: docDir).appendingPathComponent("temp.mp4")?.absoluteString 

    let docDir2 = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] as NSURL 

    let filePath = docDir2.appendingPathComponent("rendered-Video.mp4") 
    deleteFile(filePath!) 

    if FileManager.default.fileExists(atPath: myDocPath!){ 
     do{ 
      try FileManager.default.removeItem(atPath: myDocPath!) 
     }catch let error{ 
      print(error) 
     } 
    } 

    exportSession?.outputURL = filePath 
    exportSession?.outputFileType = AVFileTypeMPEG4 
    exportSession?.shouldOptimizeForNetworkUse = true 

    let start = CMTimeMakeWithSeconds(0.0, 0) 
    let range = CMTimeRange(start: start, duration: avAsset.duration) 
    exportSession?.timeRange = range 

    exportSession!.exportAsynchronously{() -> Void in 
     switch exportSession!.status{ 
     case .failed: 
      print("\(exportSession!.error!)") 
     case .cancelled: 
      print("Export cancelled") 
     case .completed: 
      let endDate = Date() 
      let time = endDate.timeIntervalSince(startDate) 
      print(time) 
      print("Successful") 
      print(exportSession?.outputURL ?? "") 
     default: 
      break 
     } 

    } 
} 

func deleteFile(_ filePath:URL) { 
    guard FileManager.default.fileExists(atPath: filePath.path) else{ 
     return 
    } 
    do { 
     try FileManager.default.removeItem(atPath: filePath.path) 
    }catch{ 
     fatalError("Unable to delete file: \(error) : \(#function).") 
    } 
}

来源

2017-05-04 03:36:31

Thanks Mate很高兴有一个Swift 3版本 –

在iOS11上运行，我们将始终收到AVAssetExportSession的零值。我们有这个案子的解决方案吗？

if let exportSession = AVAssetExportSession(asset: avAsset, presetName: AVAssetExportPresetPassthrough) { 
    //work on iOS 9 and 10 
} else { 
    //always on iOS 11 
}

来源

2017-09-29 10:43:15

Swift - 如何使用UIImagePickerController以MP4格式录制视频？

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