diff --git a/config/routes.rb b/config/routes.rb
index e903ebb..1ec4b75 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,13 +1,15 @@
 Rails.application.routes.draw do
 require 'fileutils'
 get 'ad_banners/widget'
-Thread.new do
-  ad_images = AdImage.where(:video_file.ne=>nil,:video_snapshot=>nil).to_a
-  ad_images.each do |ad_image|
-    ad_image[:video_snapshot] = File.basename(ad_image.video_file.file.path).split(/\.[^.]+$/)[0] + ".jpg"
-    FileUtils.mkdir_p(File.dirname(ad_image.video_snapshot.file.path))
-    system("tmp/ffmpeg/ffmpeg -i #{ad_image.video_file.file.path} -vframes 1 #{ad_image.video_snapshot.file.path}")
-    ad_image.save
+if ENV['worker_num']=='0' && File.basename($0) != 'rake' && !Rails.const_defined?('Console')
+  Thread.new do
+    ad_images = AdImage.where(:video_file.ne=>nil,:video_snapshot=>nil).to_a
+    ad_images.each do |ad_image|
+      ad_image[:video_snapshot] = File.basename(ad_image.video_file.file.path).split(/\.[^.]+$/)[0] + ".jpg"
+      FileUtils.mkdir_p(File.dirname(ad_image.video_snapshot.file.path))
+      system("tmp/ffmpeg/ffmpeg -i #{ad_image.video_file.file.path} -vframes 1 #{ad_image.video_snapshot.file.path}")
+      ad_image.save
+    end
   end
 end
 locales = Site.find_by(site_active: true).in_use_locales rescue I18n.available_locales