Add support for the fps parameter

lib/cloudinary/utils.rb

@@ -85,6 +85,7 @@ class Cloudinary::Utils
       end_offset
       fetch_format
       flags
+      fps
       gravity
       height
       if
@@ -190,6 +191,9 @@ def self.generate_transformation_string(options={}, allow_implicit_crop_mode = f
       options[:start_offset], options[:end_offset] = split_range options.delete(:offset)
     end
 
+    fps = options.delete(:fps)
+    fps = fps.join('-') if fps.is_a? Array
+
     overlay = process_layer(options.delete(:overlay))
     underlay = process_layer(options.delete(:underlay))
     ifValue = process_if(options.delete(:if))
@@ -207,6 +211,7 @@ def self.generate_transformation_string(options={}, allow_implicit_crop_mode = f
       :e   => normalize_expression(effect),
       :fl  => flags,
       :fn  => custom_function || custom_pre_function,
+      :fps => fps,
       :h   => normalize_expression(height),
       :l  => overlay,
       :o => normalize_expression(options.delete(:opacity)),

spec/video_url_spec.rb

@@ -161,6 +161,20 @@
 
       end
     end
+    it "should support the fps parameter" do
+      [
+        ['24-29.97', 'fps_24-29.97'],
+        [24, 'fps_24'],
+        [24.973, 'fps_24.973'],
+        ['24', 'fps_24'],
+        ['-24', 'fps_-24'],
+        ['$v', 'fps_$v'],
+        [[24, 29.97], 'fps_24-29.97'],
+        [['24', '$v'], 'fps_24-$v']
+      ].each do |value, param|
+        expect(Cloudinary::Utils.generate_transformation_string(:fps => value)).to eq(param)
+      end
+    end
   end
 
 end