diff --git a/app/static/js/ascroll.js b/app/static/js/ascroll.js
index d597bf2..c0de32b 100644
--- a/app/static/js/ascroll.js
+++ b/app/static/js/ascroll.js
@@ -35,7 +35,10 @@ function setVideoSrc(video, src) {
             }
         })
     }
-    video.src = src.replace('.webm', videoExtension)
+    src = src.replace('.webm', videoExtension)
+    if (src != video.src) {
+        video.src = src
+    }
 }
 
 function updatePlayer(video, frame, currentTime, out, src) {