Update index.html

index.html

@@ -714,14 +714,17 @@
     let normalVideoWidth = videoContainer.clientWidth;
     let audioOnlyMode = false;
   
+  document.addEventListener("DOMContentLoaded", function () {
     const previewVideo = document.getElementById("previewVideo");
+
+  });
+
     previewVideo.src = video.src;
     previewVideo.preload = "auto";
 
     // プログレスバーのイベントリスナーを更新
     progressContainer.addEventListener("mousemove", (e) => {
       if (!video.duration) return;
-      const previewVideo = document.getElementById("previewVideo");
       const rect = progressContainer.getBoundingClientRect();
       const pos = (e.clientX - rect.left) / rect.width;
       const time = pos * video.duration;