AVAssetExportSessionStatusCompletedステータス、目的cを取得してもビデオを合成できない

Question

AVAssetExportSessionStatusCompletedステータスを取得してもビデオを取得できませんでした。しかし、私はXCodeのシミュレータで使用するとビデオを取得することができました。

AVMutableComposition *mixComposition = [[AVMutableComposition alloc] init]; 
AVMutableCompositionTrack *videoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo 
                    preferredTrackID:kCMPersistentTrackID_Invalid]; 
AVMutableCompositionTrack *audioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio 
                    preferredTrackID:kCMPersistentTrackID_Invalid]; 
CMTime insertTime = kCMTimeZero; 

for(i=0;i<videoForMerging.count;i++) { 
    AVAsset *asset = [AVAsset assetWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@",videoForMerging[i]]]]; 
    CMTimeRange timeRange = CMTimeRangeMake(kCMTimeZero, asset.duration); 

    [videoTrack insertTimeRange:timeRange 
         ofTrack:[[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] 
         atTime:insertTime 
          error:nil]; 

    [audioTrack insertTimeRange:timeRange 
         ofTrack:[[asset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] 
         atTime:insertTime 
          error:nil]; 

    insertTime = CMTimeAdd(insertTime,asset.duration); 

} 
NSString* documentsDirectory= [self applicationDocumentsDirectory]; 
NSString *myDocumentPath= [documentsDirectory stringByAppendingPathComponent:@"merge_video.mp4"]; 
NSURL *urlVideoMain = [[NSURL alloc] initFileURLWithPath: myDocumentPath]; 

if([[NSFileManager defaultManager] fileExistsAtPath:myDocumentPath]) 
{ 
    [[NSFileManager defaultManager] removeItemAtPath:myDocumentPath error:nil]; 
} 

AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality]; 
exporter.outputURL = urlVideoMain; 
exporter.outputFileType = @"com.apple.quicktime-movie"; 
exporter.shouldOptimizeForNetworkUse = YES; 

[exporter exportAsynchronouslyWithCompletionHandler:^{ 

    switch ([exporter status]) 
    { 
     case AVAssetExportSessionStatusFailed: 
      break; 

     case AVAssetExportSessionStatusCancelled: 
      break; 

     case AVAssetExportSessionStatusCompleted: 
      [Util okAlert:@"Video save successfull" viewController:self]; 
      break; 

     default: 
      break; 
    } 
}]; 

}

ドキュメントディレクトリた：

-(NSString*) applicationDocumentsDirectory { NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString* basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; return basePath; } 

Answer 1

AVMutableComposition * mixComposition = [[AVMutableComposition ALLOC] INIT]。

AVMutableCompositionTrack *videoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo 
                    preferredTrackID:kCMPersistentTrackID_Invalid]; 
AVMutableCompositionTrack *audioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio 
                    preferredTrackID:kCMPersistentTrackID_Invalid]; 
CMTime insertTime = kCMTimeZero; 

for(i = 0; i < videoForMerging.count; i++) { 
    AVAsset *asset = [AVAsset assetWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@",videoForMerging[i]]]]; 
    CMTimeRange timeRange = CMTimeRangeMake(kCMTimeZero, asset.duration); 

    [videoTrack insertTimeRange:timeRange 
         ofTrack:[[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] 
         atTime:insertTime 
          error:nil]; 

    [audioTrack insertTimeRange:timeRange 
         ofTrack:[[asset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] 
         atTime:insertTime 
          error:nil]; 

    insertTime = CMTimeAdd(insertTime,asset.duration); 

    // Grab the source track from AVURLAsset for example. 
    AVAssetTrack *assetVideoTrack = [asset tracksWithMediaType:AVMediaTypeVideo].lastObject; 

    // Grab the composition video track from AVMutableComposition you already made. 
    AVMutableCompositionTrack *compositionVideoTrack = [mixComposition tracksWithMediaType:AVMediaTypeVideo].lastObject; 

    // Apply the original transform. 
    if (assetVideoTrack && compositionVideoTrack) { 
     [compositionVideoTrack setPreferredTransform:assetVideoTrack.preferredTransform]; 
    } 
} 

NSString* documentsDirectory= [self applicationDocumentsDirectory]; 
NSString *myDocumentPath= [documentsDirectory stringByAppendingPathComponent:@"merge_video.mp4"]; 
NSURL *urlVideoMain = [[NSURL alloc] initFileURLWithPath: myDocumentPath]; 

if([[NSFileManager defaultManager] fileExistsAtPath:myDocumentPath]) 
{ 
    [[NSFileManager defaultManager] removeItemAtPath:myDocumentPath error:nil]; 
} 

AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality]; 
exporter.outputURL = urlVideoMain; 
exporter.outputFileType = AVFileTypeMPEG4; 
exporter.shouldOptimizeForNetworkUse = YES; 

[exporter exportAsynchronouslyWithCompletionHandler:^{ 

    switch ([exporter status]) { 
     case AVAssetExportSessionStatusFailed: { 

      break; 
     } 
     case AVAssetExportSessionStatusCancelled: { 

      break; 
     } 
     case AVAssetExportSessionStatusCompleted: { 
      [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{ 
    PHAssetChangeRequest *changeRequest = [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:self.videoURL]; 

    NSLog(@"%@", changeRequest.description); 
} completionHandler:^(BOOL success, NSError *error) { 
    if (success) { 
     NSLog(@"saved down"); 
     [[NSFileManager defaultManager] removeItemAtURL:self.videoURL error:nil]; 

    } else { 
     NSLog(@"something wrong %@", error.localizedDescription); 
     [[NSFileManager defaultManager] removeItemAtURL:self.videoURL error:nil]; 
    } 
}]; 
      break; 
     } 
     default: 
      break; 
    } 
}];