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index.html

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   <meta property="og:title" content="AVIP Benchmark" />
   <meta property="og:description" content="Do multimodal models actually use audio in videos?" />
   <meta property="og:type" content="website" />
-  <meta property="og:video" content="thumbnail_h264.mp4" />
+  <meta property="og:video" content="thumbnail" />
   <meta name="twitter:card" content="summary_large_image" />
 
   <link rel="icon" href="assets/favicon.png" />
@@ -125,7 +125,8 @@
       <p>AVIP probes whether multimodal models actually use <strong>audio</strong> when interpreting videos.</p>
       <a class="btn" href="#media">See examples</a>
       <video autoplay muted loop playsinline poster="assets/cover.jpg">
-      <source src="assets/cover_h264.mp4" type="video/mp4" />
+        <source src="thumbnail.mp4" type="video/mp4" />
+        <source src="thumbnail.webm" type="video/webm" />
       </video>
     </section>