Swift - 如何使用UIImagePickerController以MP4格式录制视频？ [英] Swift - How to record video in MP4 format with UIImagePickerController?

问题描述

我正在创建一个应用程序，我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。我按照这个教程来设置UIImagePicker媒体类型到电影格式 imagePicker.mediaTypes = [kUTTypeMovie as String]

I am creating a app in which i need to record videos and upload it to a server. Now my project has a android version too. To support android version i have to record the videos in mp4 format. I followed this tutorial to set the UIImagePicker media type to movie format imagePicker.mediaTypes = [kUTTypeMovie as String]

UIImagePickerController 非常适合我的要求，我唯一需要改变的是它的mp4保存格式。我在 mediaTypes 中尝试了 kUTTypeMPEG4 ，但它在运行时抛出错误而没有错误描述。

The UIImagePickerController is perfect for my requirement and the only thing that i need to change is its saving format to mp4. I tried kUTTypeMPEG4 in mediaTypes but it throws error at the run time with no error description.

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
    }

我使用Swift 2.2和Xcode 8与使用Legacy swift语言版本=是

I am using Swift 2.2 and Xcode 8 with Use Legacy swift Language version = Yes

任何替代解决方案也受到赞赏。提前致谢。

Any Alternative Solutions are also appreciated. Thanks in advance.

编辑：
我发现没有办法在swift中以mp4格式直接录制视频。只能从apple的quicktime mov格式转换为所需格式。

I found out that there is no method to directly record videos in mp4 format in swift. only can be converted to required format from apple's quicktime mov format.

推荐答案

以下是一些可用于转换录制的代码视频到MP4：

Here is some code that you can use to convert the recorded video into 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__).")
}
}

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

这篇关于Swift - 如何使用UIImagePickerController以MP4格式录制视频？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！