code: public Integer[] getSupportedFrameRates() {
  		AVRational frameRates = avCodec.supported_framerates();
  
  		if (getType() != MediaType.VIDEO || frameRates == null)
  			return null;
  
  		List<Integer> rates = new ArrayList<Integer>();
  
  		AVRational frameRate;
  		int index = 0;
  		while ((frameRate = frameRates.position(index++)) != null)
  			rates.add((int) av_q2d(frameRate));
  
  		// ascending order
  		Collections.sort(rates);
  
  		return rates.toArray(new Integer[0]);
  	}
docs: Get all supported frame rates by this {@code Codec}. If this {@code Codec}
  is not a video codec, then {@code null} is returned. The frame rates are
  ordered in ascending order.
  
  @return all supported frame rates by this {@code Codec}.