def saveFile(self):
dialog = SaveDialog()
dialog.exec_()
head, tail = os.path.split(self.input_name)
file_prefix = tail.split('.')[0]
worker = VideoWriterThread(self.cap, self.frame_objects, self.log,
file_prefix, dialog.getSaveDirectory(),
dialog.isSaveImage, dialog.isSaveVideo)
worker.start()
