Copied autoplay attribute from video xmoudle to videoalpha. Now students will have the video autoplaying, and in Studio it will be pause by default.

common/lib/xmodule/xmodule/js/src/videoalpha/display/video_player.coffee

@@ -99,7 +99,7 @@ class @VideoPlayerAlpha extends SubviewAlpha
     @video.log 'load_video'
     if @video.videoType is 'html5'
       @player.setPlaybackRate @video.speed
-    unless onTouchBasedDevice()
+    unless onTouchBasedDevice() or $('.video:first').data('autoplay') == 'False'
       $('.video-load-complete:first').data('video').player.play()
 
   onStateChange: (event) =>

lms/templates/videoalpha.html

@@ -18,6 +18,7 @@
       data-start="${start}"
       data-end="${end}"
       data-caption-asset-path="${caption_asset_path}"
+      data-autoplay="${settings.MITX_FEATURES['AUTOPLAY_VIDEOS']}"
   >
     <div class="tc-wrapper">
       <article class="video-wrapper">