title: CALayerInvalidGeometry exception during HTML5 video play
body: <p>After updating to the iOS 4.2 SDK, I receive the following exception in my app:</p>
  
  <pre><code>Terminating app due to uncaught exception 'CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [nan 22]'
  </code></pre>
  
  <p>(Please see below for the copy of call stack)</p>
  
  <p>Details:</p>
  
  <p>'- <code>UIWebView</code> with video tag is inside <code>UIScrollView</code></p>
  
  <p>'- Video can play inside <code>UIWebView</code>, but when tried to zoom in, and use either zoom-out or done button from the player, the app crashes with the said exception.
  This doesn't happen on SDK 3.2</p>
  
  <pre><code>*** Call stack at first throw:
  (
   0   CoreFoundation                      0x01150be9 __exceptionPreprocess + 185
   1   libobjc.A.dylib                     0x012a55c2 objc_exception_throw + 47
   2   CoreFoundation                      0x01109628 +[NSException raise:format:arguments:] + 136
   3   CoreFoundation                      0x0110959a +[NSException raise:format:] + 58
   4   QuartzCore                          0x0200996a _ZL18CALayerSetPositionP7CALayerRKN2CA4Vec2IdEEb + 177
   5   QuartzCore                          0x020098b5 -[CALayer setPosition:] + 42
   6   QuartzCore                          0x020097cc -[CALayer setFrame:] + 763
   7   UIKit                               0x0030d307 -[UIView(Geometry) setFrame:] + 255
   8   UIKit                               0x003e6add -[UISlider setFrame:] + 166
   9   MediaPlayer                         0x00f0faee -[MPDetailSlider setFrame:] + 78
   10  MediaPlayer                         0x00f267b7 -[MPWildcatFullScreenVideoOverlay layoutSubviews] + 1280
   11  QuartzCore                          0x0200e451 -[CALayer layoutSublayers] + 181
   12  QuartzCore                          0x0200e17c CALayerLayoutIfNeeded + 220
   13  QuartzCore                          0x0200737c _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 310
   14  QuartzCore                          0x020070d0 _ZN2CA11Transaction6commitEv + 292
   15  QuartzCore                          0x020377d5 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 99
   16  CoreFoundation                      0x01131fbb __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 27
   17  CoreFoundation                      0x010c70e7 __CFRunLoopDoObservers + 295
   18  CoreFoundation                      0x0108fbd7 __CFRunLoopRun + 1575
   19  CoreFoundation                      0x0108f240 CFRunLoopRunSpecific + 208
   20  CoreFoundation                      0x0108f161 CFRunLoopRunInMode + 97
   21  GraphicsServices                    0x01a85268 GSEventRunModal + 217
   22  GraphicsServices                    0x01a8532d GSEventRun + 115
   23  UIKit                               0x002e642e UIApplicationMain + 1160
   24  ecom                                0x000022c0 main + 102
   25  ecom                                0x00002251 start + 53
  )
  terminate called after throwing an instance of 'NSException'
  </code></pre>