Detect videos with no sound, handle them like gifv

config/application.rb

@@ -8,6 +8,7 @@ Bundler.require(*Rails.groups)
 
 require_relative '../app/lib/exceptions'
 require_relative '../lib/paperclip/gif_transcoder'
+require_relative '../lib/paperclip/video_transcoder'
 
 Dotenv::Railtie.load