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

Question

我正在创建一个应用程序，其中需要录制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。我按照本教程将UIImagePicker媒体类型设置为电影格式imagePicker.mediaTypes = [kUTTypeMovie as String]

这UIImagePickerController是最适合我的要求，我唯一需要更改的是将其保存为mp4格式。我试过了kUTTypeMPEG4，mediaTypes但是在运行时抛出错误，没有错误描述。

这是我的视频捕获功能

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
    }

我正在使用Swift 2.2和Xcode 8 Use Legacy swift Language version = Yes

任何替代解决方案也表示赞赏。提前致谢。

编辑：我发现没有任何方法可以直接以mp​​4格式直接录制视频。只能从Apple的quicktime mov格式转换为所需的格式。

Answer 1

您可以使用以下代码将录制的视频转换为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__).")
}
}