some really old and hacky padding code

gistfile1.rb

     def calculate_padding(current_size, target_size)
        return nil if current_size <= target_size
        diff = current_size - target_size
        return nil if diff < 0
        while diff%4 != 0
          target_size = target_size -1
          diff = current_size - target_size
        end
        p = (diff/2).to_i
        return [ target_size, p, p ]
      end
      
      def calculate_ffmpeg_args(file, width, height)
        pad_top, pad_bottom, pad_left, pad_right = 0,0,0,0
        video = RVideo::Inspector.new(:file => file)
        x, y = video.resolution.split('x')
        ratio = x.to_f/y.to_f
        new_width = width
        new_height = (width/ratio).to_i
        if new_height > height
          new_height = height
          new_width = (new_height * ratio).to_i
        end
        if height > new_height
          pad = calculate_padding(height, new_height)
          new_height = pad[0]
          pad_top = pad[1]
          pad_bottom = pad[2]
        end
        if width > new_width
          pad = calculate_padding(width, new_width)
          new_width = pad[0]
          pad_left = pad[1]
          pad_right = pad[2]
        end
        {:res => "#{new_width}x#{new_height}", :pad_top => pad_top, :pad_bottom => pad_bottom, :pad_left => pad_left, :pad_right => pad_right}
      end