diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 7c32ed1..b2d314c 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -51,13 +51,14 @@ module ApplicationHelper
 
     options[:id] = id
     options[:class] = "video-js vjs-default skin #{classes}"
+    options[:preload] = 'preload'
 
     content_tag(:video, options) do
       if url.class == String
-        content_tag(:source, '', :src => url, :type => 'video/mp4')
+        content_tag(:source, '', :src => (url + "?t=" + Time.now.getutc.to_i.to_s))
       else
         url.each do |v|
-          concat content_tag(:source, '', :src => v)
+          concat content_tag(:source, '', :src => (v + "?t=" + Time.now.getutc.to_i.to_s))
         end
       end
     end
diff --git a/app/views/v_libras/requests/_position_step.haml b/app/views/v_libras/requests/_position_step.haml
index cc480ee..2715dce 100644
--- a/app/views/v_libras/requests/_position_step.haml
+++ b/app/views/v_libras/requests/_position_step.haml
@@ -1,7 +1,7 @@
 #position-step.wrapper
   .video_wrapper
 
-  = html5_video_tag("/system/videos/workflow/localizacao.mp4", 'id-4', 'video-wizard', :preload => 'none')
+  = html5_video_tag("/system/videos/workflow/localizacao.webm", 'id-4', 'video-wizard')
 
 :javascript
   var optionsPosition = {
diff --git a/app/views/v_libras/requests/_service_step.haml b/app/views/v_libras/requests/_service_step.haml
index ece68f2..f31db00 100644
--- a/app/views/v_libras/requests/_service_step.haml
+++ b/app/views/v_libras/requests/_service_step.haml
@@ -1,7 +1,7 @@
 #service-step.wrapper
   .video_wrapper
 
-  = html5_video_tag("/system/videos/workflow/sub_audio.mp4", 'id-2', 'video-wizard', :preload => 'none')
+  = html5_video_tag("/system/videos/workflow/sub_audio.webm", 'id-2', 'video-wizard')
 
   .row-fluid.hide
     .span1.offset3
diff --git a/app/views/v_libras/requests/_size_step.haml b/app/views/v_libras/requests/_size_step.haml
index 991c408..e1e7a29 100644
--- a/app/views/v_libras/requests/_size_step.haml
+++ b/app/views/v_libras/requests/_size_step.haml
@@ -1,7 +1,7 @@
 #size-step.wrapper
   .video_wrapper
 
-  = html5_video_tag("/system/videos/workflow/tamanho.mp4", 'id-3', 'video-wizard', :preload => 'none')
+  = html5_video_tag("/system/videos/workflow/tamanho.webm", 'id-3', 'video-wizard')
 
 :javascript
   var optionsSize = {
diff --git a/app/views/v_libras/requests/_video_step.haml b/app/views/v_libras/requests/_video_step.haml
index 74df17e..df575f2 100644
--- a/app/views/v_libras/requests/_video_step.haml
+++ b/app/views/v_libras/requests/_video_step.haml
@@ -1,7 +1,7 @@
 #video-step.wrapper
   .video_wrapper
 
-  = html5_video_tag("/system/videos/workflow/sub_audio.mp4", 'id-1', 'video-wizard', :preload => 'auto')
+  = html5_video_tag(['/system/videos/workflow/sub_audio.webm'], 'id-1', 'video-wizard')
 
   .row-fluid
     .span1.offset3
--
libgit2 0.21.2