title: Adding a AVPlayerLayer as a sublayer of the current view does not work on an iPhone 5
body: <p>I have a login screen that I wanted a video background for. It plays while the user taps the signup or login buttons. Standard thing you see in apps nowdays.</p>
  
  <p>Here is what I am doing:</p>
  
  <pre><code>- (void)addPlayerLayer {
  
      NSString *moviePath = [[NSBundle mainBundle] pathForResource:@"login_signup_pink-girl" ofType:@"mp4"];
      NSURL *movieURL = [NSURL fileURLWithPath:moviePath];
  
      AVPlayer *player = [[AVPlayer alloc] initWithURL:movieURL];
      AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
      playerLayer.frame = CGRectMake(0,0,self.view.frame.size.width+self.screenShift, self.view.frame.size.height);
      playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
  
      self.playerView = [[UIView alloc] initWithFrame:self.view.bounds];
      self.playerViewFrame = self.playerView.frame;
      [self.playerView.layer addSublayer:playerLayer];
      self.playerView.alpha = 0;
      [self.view insertSubview:self.playerView atIndex:0];
      [playerLayer.player play];
  
      [UIView animateWithDuration:0.4 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
          self.playerView.alpha = 1.0;
      } completion:nil];
  
      [UIView animateWithDuration:0.6 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
  
          self.loginButton.alpha = 1.0;
          self.createAccountButton.alpha = 1.0;
          self.skipStepButton.alpha = 1.0;
          self.mainSTbackgroundImageView.alpha = 0.0;
  
      } completion:nil];
  
  }
  </code></pre>
  
  <p>It works great in the iOS Simulator on iPhone 5, but when testing it on a real device, the video never loads, I just get a black background. It also works correctly on my iPhone 6 (physical, not simulator).</p>
  
  <p>This is a curious problem, which leads me to ask:</p>
  
  <ul>
  <li>Why would the video not load on iPhone 5?</li>
  <li>Should I be pre-loading the video somehow? (5.7MB .mp4)</li>
  <li>Is there a way to know when the video has been loaded and is ready to be displayed? Sometimes on the iPhone 5 simulator there is a bit of delay, which reveals the black background.</li>
  </ul>