gistfile1.txt

@implementation NXAssetReaderManager
@synthesize assetReaders = _assetReaders;
+ (id)sharedManager {
    static NXAssetReaderManager *sharedMyManager = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedMyManager = [[self alloc] init];
    });
    return sharedMyManager;
}

- (id)init
{
    self = [super init];
    if (self) {
        _assetReaders = [NSMutableArray array];
    }
    return self;
}

-(void)startProduceAssetReaders:(NSURL*)url {
    _producer_queue = dispatch_queue_create("producer_queue", 0);
     NSLog(@"Liczba Assetów u producenta %i",[_assetReaders count]);
    dispatch_async( _producer_queue, ^{
        AVURLAsset * asset = [AVURLAsset URLAssetWithURL:url options:nil];
        [asset loadValuesAsynchronouslyForKeys:[NSArray arrayWithObject:@"tracks"] completionHandler:
         ^{
             dispatch_async(_producer_queue, ^{
                 //             while ([_assetReaders count] < 2) {
                 while (true) {
                     NSLog(@"Liczba Assetów u producenta %i",[_assetReaders count]);
                     AVAssetTrack * videoTrack = nil;
                     NSArray * tracks = [asset tracksWithMediaType:AVMediaTypeVideo];
                     if ([tracks count] == 1)
                     {
                         videoTrack = [tracks objectAtIndex:0];
                         NSError * error = nil;
                         
                         AVAssetReader *ar = [[AVAssetReader alloc] initWithAsset:asset error:&error];
                         
                         // _movieReader is a member variable
                         
                         NSString* key = (NSString*)kCVPixelBufferPixelFormatTypeKey;
                         NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA];
                         NSDictionary* videoSettings = [NSDictionary dictionaryWithObject:value forKey:key];
                         AVAssetReaderOutput *output =[AVAssetReaderTrackOutput assetReaderTrackOutputWithTrack:videoTrack outputSettings:videoSettings];
                         [ar addOutput:output];
                         
                         [_assetReaders addObject:ar];
                         //                         dispatch_async( dispatch_get_main_queue(), ^{
                         //
                         //                         });
                         NSLog(@"Dodano nowego AssetReadera");
                     }
                 }
             });
         }];
    });
}