code: public void setAltText(final String altText) {
  		String currAltText = getAltText();
  
  		if (!Objects.equals(altText, currAltText)) {
  			getOrCreateComponentModel().altText = altText;
  		}
  	}
docs: Sets the alternative text to display when the video clip can not be played.
  
  @param altText the text to set.