ios 以 mp4 格式录制、保存和/或转换视频？

Record, save and/or convert video in mp4 format?

提问by scourGINHO

I have the following problem - I am trying to create an app that records video, then save it to the camera roll and after that I am uploading that video to the web. The problem is that the only supported format is "mp4", but my videos are "mov".

我有以下问题 - 我正在尝试创建一个记录视频的应用程序，然后将其保存到相机胶卷，然后将该视频上传到网络。问题是唯一支持的格式是“mp4”，但我的视频是“mov”。

So my question is how to save video from camera in "mp4" format, or save it in "mov" and then convert it to "mp4".

所以我的问题是如何以“mp4”格式保存来自相机的视频，或者将其保存为“mov”，然后将其转换为“mp4”。

Here's my code:

这是我的代码：

• this is how I open the camera:

  picker = [[UIImagePickerController alloc] init];
  picker.sourceType = UIImagePickerControllerSourceTypeCamera;
  picker.delegate = self;
  picker.showsCameraControls = YES;
  picker.allowsEditing = YES;
  picker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];
  [self presentViewController:picker animated:YES completion:nil];
  

• this is how I save the video:

  NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
  
  if (CFStringCompare ((__bridge_retained CFStringRef) mediaType, kUTTypeMovie, 0) == kCFCompareEqualTo)
  {
      NSString *moviePath = [[info objectForKey:UIImagePickerControllerMediaURL] path];
      videoURL = info[UIImagePickerControllerMediaURL];
  
      if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(moviePath))
      {
          UISaveVideoAtPathToSavedPhotosAlbum(moviePath, self, nil, nil);
      }
  }
  [nextScreenButton setTitle:@"ПРОДЪЛЖИ" forState:UIControlStateNormal];
  [self dismissViewControllerAnimated:YES completion:nil];
  

• 这是我打开相机的方式：

  picker = [[UIImagePickerController alloc] init];
  picker.sourceType = UIImagePickerControllerSourceTypeCamera;
  picker.delegate = self;
  picker.showsCameraControls = YES;
  picker.allowsEditing = YES;
  picker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];
  [self presentViewController:picker animated:YES completion:nil];
  

• 这是我保存视频的方式：

  NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
  
  if (CFStringCompare ((__bridge_retained CFStringRef) mediaType, kUTTypeMovie, 0) == kCFCompareEqualTo)
  {
      NSString *moviePath = [[info objectForKey:UIImagePickerControllerMediaURL] path];
      videoURL = info[UIImagePickerControllerMediaURL];
  
      if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(moviePath))
      {
          UISaveVideoAtPathToSavedPhotosAlbum(moviePath, self, nil, nil);
      }
  }
  [nextScreenButton setTitle:@"ПРОДЪЛЖИ" forState:UIControlStateNormal];
  [self dismissViewControllerAnimated:YES completion:nil];
  

Thanks in advance!

提前致谢！

回答by Rahul Patel

You are doing right thing.. Now you need to convert this mov file to mp4 as below.

你做得对。现在你需要把这个 mov 文件转换成 mp4，如下所示。

NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
NSString *videoPath1 = @"";
if (CFStringCompare ((__bridge_retained CFStringRef) mediaType, kUTTypeMovie, 0) == kCFCompareEqualTo)
 {
   if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(moviePath))
   {
         NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
         NSString *moviePath = [[info objectForKey:UIImagePickerControllerMediaURL] path];
         videoPath1 =[NSString stringWithFormat:@"%@/xyz.mov",docDir];
         NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
         NSData *videoData = [NSData dataWithContentsOfURL:videoURL];
         [videoData writeToFile:videoPath1 atomically:NO];
       //  UISaveVideoAtPathToSavedPhotosAlbum(moviePath, self, nil, nil);
   }
 }

    AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:videoPath1] options:nil];
    NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:avAsset];

    if ([compatiblePresets containsObject:AVAssetExportPresetLowQuality])
    {
        AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]initWithAsset:avAsset presetName:AVAssetExportPresetPassthrough];
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        videoPath = [NSString stringWithFormat:@"%@/xyz.mp4", [paths objectAtIndex:0]];
        exportSession.outputURL = [NSURL fileURLWithPath:videoPath];
        NSLog(@"videopath of your mp4 file = %@",videoPath);  // PATH OF YOUR .mp4 FILE
        exportSession.outputFileType = AVFileTypeMPEG4;

      //  CMTime start = CMTimeMakeWithSeconds(1.0, 600);
      //  CMTime duration = CMTimeMakeWithSeconds(3.0, 600);           
      //  CMTimeRange range = CMTimeRangeMake(start, duration);            
      //   exportSession.timeRange = range;        
      //  UNCOMMENT ABOVE LINES FOR CROP VIDEO   
        [exportSession exportAsynchronouslyWithCompletionHandler:^{

            switch ([exportSession status]) {

                case AVAssetExportSessionStatusFailed:
                    NSLog(@"Export failed: %@", [[exportSession error] localizedDescription]);

                    break;

                case AVAssetExportSessionStatusCancelled:

                    NSLog(@"Export canceled");

                    break;

                default:

                    break;

            }
             UISaveVideoAtPathToSavedPhotosAlbum(videoPath, self, nil, nil);
            [exportSession release];

        }];

    }
[nextScreenButton setTitle:@"ПРОДЪЛЖИ" forState:UIControlStateNormal];
[self dismissViewControllerAnimated:YES completion:nil];

回答by Jigar Thakkar

Here is the code to convert mov video into mp4 for swift

这是将 mov 视频快速转换为 mp4 的代码

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__).")
}
}

Swift 3

斯威夫特 3

func encodeVideo(_ videoURL: URL)  {

    let avAsset = AVURLAsset(url: videoURL, options: nil)

    let startDate = Foundation.Date()

    //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 = URL(fileURLWithPath: documentsDirectory).appendingPathComponent("temp.mp4").absoluteString
    let url = URL(fileURLWithPath: myDocumentPath)

    let documentsDirectory2 = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] as URL

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

    //Check if the file already exists then remove the previous file
    if FileManager.default.fileExists(atPath: myDocumentPath) {
        do {
            try FileManager.default.removeItem(atPath: myDocumentPath)
        }
        catch let error {
            print(error)
        }
    }



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

    exportSession!.exportAsynchronously(completionHandler: {() -> Void in
        switch self.exportSession!.status {
        case .failed:
            print("%@",self.exportSession?.error)
        case .cancelled:
            print("Export canceled")
        case .completed:
            //Video conversion finished
            let endDate = Foundation.Date()

            let time = endDate.timeIntervalSince(startDate)
            print(time)
            print("Successful!")
            print(self.exportSession.outputURL)
            self.mediaPath = self.exportSession.outputURL?.path as NSString!
            //self.mediaPath = String(self.exportSession.outputURL!)
        // self.mediaPath = self.mediaPath.substringFromIndex(7)
        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).")
    }
}

回答by Meet Doshi

Here you can specify video type, quality and output url for compress video.

您可以在此处指定压缩视频的视频类型、质量和输出 url。

See below methods:

请参阅以下方法：

- (void) saveVideoToLocal:(NSURL *)videoURL {

    @try {
        NSArray *documentsDirectory = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *docPath = [documentsDirectory objectAtIndex:0];

        NSString *videoName = [NSString stringWithFormat:@"sampleVideo.mp4"];
        NSString *videoPath = [docPath stringByAppendingPathComponent:videoName];

        NSURL *outputURL = [NSURL fileURLWithPath:videoPath];
        NSLog(@"Loading video");

        [self convertVideoToLowQuailtyWithInputURL:videoURL outputURL:outputURL handler:^(AVAssetExportSession *exportSession) {

             if (exportSession.status == AVAssetExportSessionStatusCompleted) {
                 NSLog(@"Compression is done");
             }
         }];
    }
    @catch (NSException *exception) {
        NSLog(@"Exception :%@",exception.description);
    }
}


//---------------------------------------------------------------

- (void)convertVideoToLowQuailtyWithInputURL:(NSURL*)inputURL outputURL:(NSURL*)outputURL handler:(void (^)(AVAssetExportSession*))handler {
    [[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil];
    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:inputURL options:nil];
    AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetPassthrough];
    exportSession.outputURL = outputURL;
    exportSession.outputFileType = AVFileTypeMPEG4;
    [exportSession exportAsynchronouslyWithCompletionHandler:^(void) {
        handler(exportSession);
    }];
}

Yes, you can compress video using AVAssetExportSession. Here, I saved compress video to document directoryof application. You can check detail working of this in this code.

是的，您可以使用AVAssetExportSession. 在这里，我将压缩视频保存到document directory应用程序。您可以在此代码中检查此操作的详细信息。

If you have still issues, then refer thisand this.

如果您仍然有问题，请参考this和this。

回答by Amjad Khan

Swift 5 code to convert video into mp4 in Swift

在 Swift 中将视频转换为 mp4 的 Swift 5 代码

First you need to import this

首先你需要导入这个

import AVFoundation

then you can write this code and pass the URL into it.

然后您可以编写此代码并将 URL 传递到其中。

func videoConvert(videoURL: URL)  {
    let avAsset = AVURLAsset(url: videoURL as URL, options: nil)
    let startDate = NSDate()
    //Create Export session

    let 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).appendingPathComponent("temp.mp4")?.absoluteString
    let url = NSURL(fileURLWithPath: myDocumentPath!)

    let documentsDirectory2 = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] as NSURL
    let filePath = documentsDirectory2.appendingPathComponent("VideoConvert.mp4")
    deleteFile(filePath: filePath!)

    //Check if the file already exists then remove the previous file
    if FileManager.default.fileExists(atPath: myDocumentPath!) {
        do {
            try FileManager.default.removeItem(atPath: myDocumentPath!)
        }
        catch let error {
            print(error)
        }
    }
    //URL
    print(filePath!.absoluteString)
    exportSession!.outputURL = filePath
    exportSession!.outputFileType = AVFileType.mp4
    exportSession!.shouldOptimizeForNetworkUse = true
    let start = CMTimeMakeWithSeconds(0.0, preferredTimescale: 0)
    let range = CMTimeRangeMake(start: start, duration: avAsset.duration)
    exportSession!.timeRange = range
    exportSession!.exportAsynchronously(completionHandler: {() -> Void in
        switch exportSession!.status {
            case .failed:
                print("%@",exportSession!.error ?? "Failed to get error")
            case .cancelled:
                print("Export canceled")
            case .completed:
                //Video conversion finished
                let endDate = NSDate()
                let time = endDate.timeIntervalSince(startDate as Date)
                print(time)
                print("Successful!")
                print(exportSession!.outputURL)
            default:
                break
        }
    })
}

For calling the function you can go with

对于调用该函数，您可以使用

videoConvert(videoURL: fileUrl!)

or

或者

self.videoConvert(videoURL: fileUrl!)

then you will get the video converted and stored into the documentdirectory with name VideoConvert.mp4

然后您将转换视频并存储到名称为VideoConvert.mp4的文档目录中

Thanks for the @Jigar Thakkaranswer.

感谢@Jigar Thakkar 的回答。