script>
function play() {
  const urlvid = document.getElementById("urlvideo").value.trim();
  const n = parseInt(document.getElementById("nbrvideo").value);
  const playerContainer = document.getElementById("player1");
  playerContainer.innerHTML = ""; // Clear previous videos

  let vid = "";
  let platform = "";

  // Identify platform (YouTube/Facebook)
  if (urlvid.includes("youtu.be") || urlvid.includes("youtube.com")) {
    platform = "YouTube";
    if (urlvid.includes("youtu.be")) {
      vid = urlvid.split("/").pop();
    } else if (urlvid.includes("shorts")) {
      vid = urlvid.split("shorts/")[1].split("?")[0];
    } else if (urlvid.includes("?v=")) {
      vid = urlvid.split("?v=")[1].split("&")[0];
    }
  } else if (urlvid.includes("facebook.com")) {
    platform = "Facebook";
    vid = urlvid; // Use full Facebook link
  } else {
    alert("Invalid URL. Please enter a valid YouTube or Facebook video link.");
    return;
  }

  // Predefined center video embed (YouTube)
  const predefinedVid = "2jnw1E_J9_8"; // Predefined YouTube video ID
  const predefinedBaseUrl = `https://www.youtube.com/embed/${predefinedVid}?autoplay=1&mute=1&loop=1&rel=0&vq=144p`;
  const predefinedContainer = document.createElement("div");
  predefinedContainer.style.textAlign = "center"; // Center alignment
  const predefinedIframe = document.createElement("iframe");
  predefinedIframe.src = predefinedBaseUrl;
  predefinedIframe.style.width = "480px"; // Large size for center video
  predefinedIframe.style.height = "260px";
  predefinedIframe.style.margin = "10px auto";
  predefinedIframe.setAttribute("allowfullscreen", "");
  predefinedContainer.appendChild(predefinedIframe);
  playerContainer.appendChild(predefinedContainer);
  
  
  // Embed user's video
  if (vid) {
    for (let i = 0; i < n; i++) {
      const iframe = document.createElement("iframe");
      if (platform === "YouTube") {
        iframe.src = `https://www.youtube.com/embed/${vid}?autoplay=1&mute=1&rel=0&vq=144p`;
      } else if (platform === "Facebook") {
        iframe.src = `https://www.facebook.com/plugins/video.php?href=${encodeURIComponent(
          vid
        )}&autoplay=1&mute=1&show_text=0`;
      }
      iframe.style.width = "256px";
      iframe.style.height = "144px";
      iframe.style.margin = "10px";
      iframe.setAttribute("allowfullscreen", "");
      playerContainer.appendChild(iframe);
    }
  }
}
</script>