Readds auto-rotate option

Author: joaoffcosta

lib/paperclip/paperclip_processors/transcoder.rb

@@ -56,6 +56,18 @@ def make
         if output_is_image?
           @time = @time.call(@meta, @options) if @time.respond_to?(:call)
           @cli.filter_seek @time
+
+          if @auto_rotate && !@meta[:rotate].nil?
+            log "Adding rotation #{@meta[:rotate]}"
+            case @meta[:rotate]
+            when 90
+              @convert_options[:output][:vf] = "'transpose=1'"
+            when 180
+              @convert_options[:output][:vf] = "'vflip, hflip'"
+            when 270
+              @convert_options[:output][:vf] = "'transpose=2'"
+            end
+          end
         end
 
         if @convert_options.present?