ビデオクリップをVineのように1つのビデオにまとめます

Question

UIImagePickerControllerを使用して、複数のビデオクリップを録画してから、Vineアプリと同様に1つのビデオにステッチします。誰かがビデオクリップをどのようにして1つのビデオにまとめることができるかについて、正しい方向で私を指摘できますか？

Answer 1

Ray Wenderlichのサイトには、これをカバーするチュートリアルがあります。 http://www.raywenderlich.com/13418/how-to-play-record-edit-videos-in-ios

Answer 2

ここでは、レイウェンデリックのブログに部分的に基づいてビデオをつなぎ合わせる方法の例を示します。

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{ 
    [appDelegate.playerLayer removeFromSuperlayer]; 

    if (self.firstAsset) 
    { 
    self.secondAssetURL = [info objectForKey:UIImagePickerControllerMediaURL]; 
    self.secondAsset = [AVAsset assetWithURL:self.secondAssetURL]; 
    } 
    else 
    { 
    self.firstAssetURL = [info objectForKey:UIImagePickerControllerMediaURL]; 
    self.firstAsset = [AVAsset assetWithURL:self.firstAssetURL]; 
    } 

    if (self.secondAsset) 
    { 
    CMTime recordTime = CMTimeMakeWithSeconds(self.recordTime, NSEC_PER_SEC); 
    AVMutableComposition *mixComposition = [AVMutableComposition new]; 

    AVMutableCompositionTrack *videoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; 
    [videoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, self.firstAsset.duration) ofTrack:[[self.firstAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:kCMTimeZero error:nil]; 
    [videoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, self.secondAsset.duration) 
         ofTrack:[[self.secondAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:recordTime error:nil]; 

    AVURLAsset *firstAudioAsset = [[AVURLAsset alloc] initWithURL:self.firstAssetURL options:nil]; 
    AVURLAsset *secondAudioAsset = [[AVURLAsset alloc] initWithURL:self.secondAssetURL options:nil]; 

    AVAssetTrack *firstAudioTrack = [[firstAudioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]; 
    AVAssetTrack *secondAudioTrack = [[secondAudioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]; 

    AVMutableCompositionTrack *compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; 
    [compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, firstAudioAsset.duration) ofTrack:firstAudioTrack atTime:kCMTimeZero error:nil]; 
    [compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, secondAudioAsset.duration) ofTrack:secondAudioTrack atTime:recordTime error:nil]; 

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *myPathDocs = [documentsDirectory stringByAppendingPathComponent: 
          [NSString stringWithFormat:@"mergeVideo-%d.mov",arc4random() % 1000]]; 
    NSURL *url = [NSURL fileURLWithPath:myPathDocs]; 
    // 5 - Create exporter 
    AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition 
                     presetName:AVAssetExportPresetHighestQuality]; 
    exporter.outputURL=url; 
    exporter.outputFileType = AVFileTypeQuickTimeMovie; 
    exporter.shouldOptimizeForNetworkUse = YES; 
    [exporter exportAsynchronouslyWithCompletionHandler:^{ 
     NSLog(@"we are now exporting"); 
     int exportStatus = exporter.status; 
     switch (exportStatus) { 
     case AVAssetExportSessionStatusFailed: { 
      // log error to text view 
      NSError *exportError = exporter.error; 
      NSLog (@"AVAssetExportSessionStatusFailed: %@", exportError); 
      break; 
     } 
     case AVAssetExportSessionStatusCompleted: { 
      NSLog (@"AVAssetExportSessionStatusCompleted"); 
      self.firstAssetURL = exporter.outputURL; 
      self.firstAsset = [AVAsset assetWithURL:self.firstAssetURL]; 
      dispatch_async(dispatch_get_main_queue(), ^{ 
      [self layoutVideo:exporter.outputURL]; 
      }); 
      break; 
     } 
     default: { NSLog (@"didn't get export status"); break;} 
     } 

    }]; 
    } 
    else 
    { 
    [self layoutVideo:[info objectForKey:@"UIImagePickerControllerMediaURL"]]; 
    } 

}