Getting a Screenshot for a AVPlayer

gistfile1.m

- (UIImage *)screenshotFromPlayer:(AVPlayer *)player atTime:(CMTime)time {
    
    CMTime actualTime;
    NSError *error;
    int attemptNumber = 0;
    BOOL success = NO;
    UIImage *image;
    
    while (attemptNumber < 5 && !success) {
        NSLog(@"Attempt Number: %d", attemptNumber);
        NSURL *url = [NSURL fileURLWithPath:[TTFVideoViewController shareVideoPath]];
        NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES]
                                                            forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
        AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:url options:options];
//        AVAssetImageGenerator *generator = [AVAssetImageGenerator assetImageGeneratorWithAsset:player.currentItem.asset];
        AVAssetImageGenerator *generator = [AVAssetImageGenerator assetImageGeneratorWithAsset:asset];
        [generator setAppliesPreferredTrackTransform:YES];
        [generator setRequestedTimeToleranceBefore:kCMTimeZero];
        [generator setRequestedTimeToleranceAfter:kCMTimeZero];
        CGImageRef cgIm = [generator copyCGImageAtTime:time
                                            actualTime:&actualTime
                                                 error:&error];
        image = [UIImage imageWithCGImage:cgIm];
        CFRelease(cgIm);
        
        if (nil != error) {
            NSLog(@"Error making screenshot: %@", [error localizedDescription]);
            return nil;
        }
        
        float actual =  CMTimeGetSeconds(actualTime);
        float requested =  CMTimeGetSeconds(time);
        NSLog(@"Actual screenshot time: %f Requested screenshot time: %f", actual, requested);
        if (fabsf(actual - requested) > 0.01) {
            NSLog(@"Try again!");
            attemptNumber++;
        } else {
            success = YES;
        }
    }
    
    if (!success) {
        image = [self superExactScreenshoot:player atTime:time];
    }
    
    return image;
}