ビデオをDocumentsDirectoryに保存する

Question

私は自分自身をコーディングで改善しようとしていますが、この問題を解決するには十分ではありません。 以下のコードを使用して、ビデオとオーディオをマージし、最終ビデオをカメラロールに保存します。完璧に動作するコードは必要ですが、そのビデオを一時的なドキュメントに保存して、小さな変更を行うたびにビデオを保存せずに変更または変更することができます。ここで

私のコードです：私はにビデオを保存する必要はありません、言ったように

- (void)exportDidFinish:(AVAssetExportSession*)session { 
    if (session.status == AVAssetExportSessionStatusCompleted) { 
     NSURL *outputURL = session.outputURL; 
     ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; 
     if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:outputURL]) { 
      [library writeVideoAtPathToSavedPhotosAlbum:outputURL completionBlock:^(NSURL *assetURL, NSError *error){ 
       dispatch_async(dispatch_get_main_queue(), ^{ 
        if (error) { 
         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Video Saving Failed" 
                     delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
         [alert show]; 
        } else { 
         AVPlayerItem * playeritem = [AVPlayerItem playerItemWithURL:outputURL]; 
         [_player replaceCurrentItemWithPlayerItem:playeritem]; 
         [_player play]; 

        } 
       }); 
      }]; 
     } 
    } 
} 

：私はカメラロールにビデオをエクスポートする場所

- (IBAction)addBackgroundMusicAction:(UIButton *)sender { 
    if (self.asset == nil) { 
     return; 
    } 


    NSString *outPutPath = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"mergeVideo-%d.mov",arc4random() % 1000]]; 

    NSURL *outPutUrl = [NSURL fileURLWithPath:outPutPath]; 
    if ([[NSFileManager defaultManager] fileExistsAtPath:outPutPath]) 
    { 
     [[NSFileManager defaultManager] removeItemAtPath:outPutPath error:nil]; 
    } 
    AVMutableComposition *composition = [AVMutableComposition composition]; 
    CMTimeRange videoTimeRange = CMTimeRangeMake(kCMTimeZero, self.asset.duration); 
    AVMutableCompositionTrack *videoTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; 

    AVAssetTrack *videoAssetTrack = [[self.asset tracksWithMediaType:AVMediaTypeVideo] firstObject]; 
    [videoTrack insertTimeRange:videoTimeRange ofTrack:videoAssetTrack atTime:kCMTimeZero error:nil]; 

    AVURLAsset *audioAsset = [[AVURLAsset alloc] initWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"myAudio" ofType:@"mp3"]] options:nil]; 
    AVMutableCompositionTrack *audioTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; 
    AVAssetTrack *audioAssetTrack = [[audioAsset tracksWithMediaType:AVMediaTypeAudio] firstObject]; 
    [audioTrack insertTimeRange:videoTimeRange ofTrack:audioAssetTrack atTime:kCMTimeZero error:nil]; 


    // 3.1 - Create AVMutableVideoCompositionInstruction 
    AVMutableVideoCompositionInstruction *mainInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction]; 
    mainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, self.asset.duration); 
    // 3.2 - Create an AVMutableVideoCompositionLayerInstruction for the video track and fix the orientation. 
    AVMutableVideoCompositionLayerInstruction *videolayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack]; 
    UIImageOrientation videoAssetOrientation_ = UIImageOrientationUp; 
    BOOL isVideoAssetPortrait_ = NO; 
    CGAffineTransform videoTransform = videoAssetTrack.preferredTransform; 
    if (videoTransform.a == 0 && videoTransform.b == 1.0 && videoTransform.c == -1.0 && videoTransform.d == 0) { 
     videoAssetOrientation_ = UIImageOrientationRight; 
     isVideoAssetPortrait_ = YES; 
    } 
    if (videoTransform.a == 0 && videoTransform.b == -1.0 && videoTransform.c == 1.0 && videoTransform.d == 0) { 
     videoAssetOrientation_ = UIImageOrientationLeft; 
     isVideoAssetPortrait_ = YES; 
    } 
    if (videoTransform.a == 1.0 && videoTransform.b == 0 && videoTransform.c == 0 && videoTransform.d == 1.0) { 
     videoAssetOrientation_ = UIImageOrientationUp; 
    } 
    if (videoTransform.a == -1.0 && videoTransform.b == 0 && videoTransform.c == 0 && videoTransform.d == -1.0) { 
     videoAssetOrientation_ = UIImageOrientationDown; 
    } 
    [videolayerInstruction setTransform:videoAssetTrack.preferredTransform atTime:kCMTimeZero]; 
    [videolayerInstruction setOpacity:0.0 atTime:self.asset.duration]; 

    // 3.3 - Add instructions 
    mainInstruction.layerInstructions = [NSArray arrayWithObjects:videolayerInstruction,nil]; 

    AVMutableVideoComposition *mainCompositionInst = [AVMutableVideoComposition videoComposition]; 

    CGSize naturalSize; 
    if(isVideoAssetPortrait_){ 
     naturalSize = CGSizeMake(videoAssetTrack.naturalSize.height, videoAssetTrack.naturalSize.width); 
    } else { 
     naturalSize = videoAssetTrack.naturalSize; 
    } 

    float renderWidth, renderHeight; 
    renderWidth = naturalSize.width; 
    renderHeight = naturalSize.height; 
    mainCompositionInst.renderSize = CGSizeMake(renderWidth, renderHeight); 
    mainCompositionInst.instructions = [NSArray arrayWithObject:mainInstruction]; 
    mainCompositionInst.frameDuration = CMTimeMake(1, 30); 


    AVAssetExportSession * assetExport = [[AVAssetExportSession alloc] initWithAsset:composition presetName:AVAssetExportPresetMediumQuality]; 
    assetExport.outputURL = outPutUrl; 
    assetExport.outputFileType = AVFileTypeQuickTimeMovie; 
    assetExport.shouldOptimizeForNetworkUse = YES; 
    assetExport.videoComposition = mainCompositionInst; 
    [assetExport exportAsynchronouslyWithCompletionHandler:^{ 
     dispatch_async(dispatch_get_main_queue(), ^{ 
      [self exportDidFinish:assetExport]; 
     }); 
    }]; 
} 

そして彼女はありますカメラロール、私は一時的にそれを保存する必要があります。また、別のボタンを押すと、そのビデオを読み込む必要があります。その動画を保存してもう一度読み込みます。次のコード

おかげ

Answer 1

使用：

NSData *videoData = [NSData dataWithContentsOfURL:outputURL]; 
    if (videoData) { 
     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
     NSString *documentsDirectory = [paths objectAtIndex:0]; 
     NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"MyFolder"]; 
     // Create folder if needed 
     [[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:YES attributes:nil error:nil]; 

     NSString *filePath = [dataPath stringByAppendingPathComponent:@"test.mp4"]; 
     if ([videoData writeToFile:filePath atomically:YES]) { 
      // yeah - file written 
     } else { 
      // oops - file not written 
     } 
    } else { 
     // oops - couldn't get data 
    }