以mp4格式录制,保存和/或转换视频？

Question

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,之后我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".

所以我的问题是如何以"mp4"格式从相机保存视频,或将其保存在"mov"中,然后将其转换为"mp4".

这是我的代码:

• 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:@"????????" forState:UIControlStateNormal];
  [self dismissViewControllerAnimated:YES completion:nil];
  

提前致谢!

Answer 1

你正在做正确的事情..现在你需要将这个mov文件转换为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:@"????????" forState:UIControlStateNormal];
[self dismissViewControllerAnimated:YES completion:nil];

Answer 2

这是将mov视频转换为mp4 for swift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__).")
}
}

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).")
    }
}