--- a/video_filter.codecs.inc
+++ b/video_filter.codecs.inc
@@ -509,7 +509,7 @@ function video_filter_teachertube($video) {
  * @see video_filter_codec_info()
  */
 function video_filter_vimeo($video) {
-  $video['source'] = 'http://www.vimeo.com/moogaloop.swf?clip_id=' . $video['codec']['matches'][1] . '&server=www.vimeo.com&fullscreen=1&show_title=1&show_byline=1&show_portrait=0&color=&autoplay=' . $video['autoplay'];
+  $video['source'] = '//www.vimeo.com/moogaloop.swf?clip_id=' . $video['codec']['matches'][1] . '&server=www.vimeo.com&fullscreen=1&show_title=1&show_byline=1&show_portrait=0&color=&autoplay=' . $video['autoplay'];
 
   return video_filter_flash($video);
 }
@@ -520,7 +520,7 @@ function video_filter_vimeo($video) {
  * @see video_filter_codec_info()
  */
 function video_filter_vimeo_html5($video) {
-  $video['source'] = 'http://player.vimeo.com/video/' . $video['codec']['matches'][1] . ($video['autoplay'] ? '?autoplay=1' : '');
+  $video['source'] = '//player.vimeo.com/video/' . $video['codec']['matches'][1] . ($video['autoplay'] ? '?autoplay=1' : '');
 
   return video_filter_iframe($video);
 }
@@ -537,7 +537,7 @@ function video_filter_youtube($video) {
     'fs' => 'fs=1',
   );
 
-  $video['source'] = 'http://www.youtube.com/v/' . $video['codec']['matches'][1] . '?' . implode('&', $attributes);
+  $video['source'] = '//www.youtube.com/v/' . $video['codec']['matches'][1] . '?' . implode('&', $attributes);
 
   $params['wmode'] = 'opaque';
 
@@ -555,7 +555,7 @@ function video_filter_youtube_html5($video) {
     'autoplay' => $video['autoplay'] ? 'autoplay=1' : 'autoplay=0',
     'wmode' => 'wmode=opaque',
   );
-  $video['source'] = 'http://www.youtube.com/embed/' . $video['codec']['matches'][1] . '?' . implode('&', $attributes);
+  $video['source'] = '//www.youtube.com/embed/' . $video['codec']['matches'][1] . '?' . implode('&', $attributes);
 
   return video_filter_iframe($video);
 }
@@ -571,7 +571,7 @@ function video_filter_youtube_playlist_html5($video) {
     'autoplay' => $video['autoplay'] ? 'autoplay=1' : 'autoplay=0',
     'wmode' => 'wmode=opaque',
   );
-  $video['source'] = 'http://www.youtube.com/embed/videoseries?list=' . $video['codec']['matches'][1] . '&' . implode('&', $attributes);
+  $video['source'] = '//www.youtube.com/embed/videoseries?list=' . $video['codec']['matches'][1] . '&' . implode('&', $attributes);
 
   return video_filter_iframe($video);
 }