Gab Social. All are welcome.

lib/paperclip/gif_transcoder.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+module Paperclip
+  # This transcoder is only to be used for the MediaAttachment model
+  # to convert animated gifs to webm
+  class GifTranscoder < Paperclip::Processor
+    def make
+      return File.open(@file.path) unless needs_convert?
+
+      final_file = Paperclip::Transcoder.make(file, options, attachment)
+
+      attachment.instance.file_file_name    = File.basename(attachment.instance.file_file_name, '.*') + '.mp4'
+      attachment.instance.file_content_type = 'video/mp4'
+      attachment.instance.type              = MediaAttachment.types[:gifv]
+
+      final_file
+    end
+
+    private
+
+    def needs_convert?
+      num_frames = identify('-format %n :file', file: file.path).to_i
+      options[:style] == :original && num_frames > 1
+    end
+  end
+end