public void deleteField(Mp4FieldKey mp4Key) throws KeyNotFoundException {
  if (mp4Key == null) {
    throw new KeyNotFoundException();
  }
  super.deleteField(mp4Key.getFieldName());
}

public void deleteField ( Mp4FieldKey mp4Key ) throws KeyNotFoundException { if ( mp4Key == null ) { throw new KeyNotFoundException ( ) ; } super . deleteField ( mp4Key . getFieldName ( ) ) ; }
delete fields with this mp4key
