Symptoms

If an iBooks Author widget contains embedded video, the operation may return an alert similar to the one below when submitting your iBooks to the iBookstore:

 "ERROR ITMS-9000: "MyBook.ibooks: Book contains unsupported video MyBook.ibooks:/OPS/assets/widgets/mywidget.wdgt/assets/MyVideo.mp4.  Detected ftyp mp42" at Book (MZItmspBookPackage)"