@implementation AVAssetExportSession (Testing)

- (void) exportSynchronously
{
    dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
    [self exportAsynchronouslyWithCompletionHandler:^{
        dispatch_semaphore_signal(semaphore);
    }];
    dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
    dispatch_release(semaphore);
}

@end