Added setting rotation metadata

lib/av/commands/avconv.rb

@@ -30,6 +30,8 @@ def filter_rotate degrees
           when 270
             add_output_param vf: 'cclock'
         end
+
+        self
       end
 
     end

lib/av/commands/base.rb

@@ -180,6 +180,27 @@ def parse_param param
         end
         list
       end
+
+      def metadata_rotate degrees
+        add_output_param :'metadata:s:v:0', "rotate=#{degrees}"
+
+        self
+      end
+
+      def filter_metadata_rotate degrees
+        filter_rotate degrees
+
+        if @source
+          current_rotate = identify(@source)[:rotate] || 0
+        else
+          ::Av.log "Source has not been set - assuming current rotation metadata is 0"
+          current_rotate = 0
+        end
+
+        metadata_rotate (current_rotate - degrees) % 360
+
+        self
+      end
     end
   end
 end

lib/av/commands/ffmpeg.rb

@@ -29,6 +29,7 @@ def filter_volume vol
 
       def filter_rotate degrees
         raise ::Av::InvalidFilterParameter unless degrees % 90 == 0
+
         case degrees
           when 90
             add_output_param vf: 'transpose=1'
@@ -37,6 +38,7 @@ def filter_rotate degrees
           when 270
             add_output_param vf: 'transpose=2'
         end
+
         self
       end
     end

spec/av/base_spec.rb

@@ -67,5 +67,23 @@
     it { expect { subject.run }.not_to raise_exception }
 
   end
+
+  describe '.metadata_rotate' do
+    before do
+      subject.metadata_rotate(90)
+    end
+
+    it { expect(subject.output_params.to_s).to eq '-metadata:s:v:0 rotate=90' }
+  end
+
+  describe '.filter_metadata_rotate' do
+    before do
+      subject.add_source(source)
+      subject.filter_metadata_rotate(90)
+    end
+
+    it { expect(subject.output_params.to_s).to match /-metadata:s:v:0 rotate=270/ }
+    it { expect(subject.output_params.to_s).to match /-vf (clock|transpose=1)/ }
+  end
 end