diff --git a/demos/web/index.html b/demos/web/index.html
index 7abf4d3..c698ce0 100644
--- a/demos/web/index.html
+++ b/demos/web/index.html
@@ -41,7 +41,7 @@ limitations under the License.
                 </ul>
                 <div id='tab-preview' class='tab-content'>
                     <video id="videoel" width="400" height="300"
-                           preload="auto" loop></video>
+                           muted autoplay preload="auto" loop></video>
                 </div>
                 <div id='tab-annotated' class='tab-content current'>
                     <div id="detectedFaces"></div>