src/web/player.html

<div class="dm-player" style="display:flex;flex-direction:column;gap:6px;">
  <video id="dm-video" controls preload="metadata"
         src="/gradio_api/file=__VIDEO_PATH__"
         onerror="if(!this.dataset.fb){this.dataset.fb='1';this.src='/file=__VIDEO_PATH__';}"
         style="width:100%;max-height:430px;background:#000;border-radius:8px;"></video>
  <p style="margin:0;font-size:12px;opacity:0.75;">
    Use the seek bar to find the exact moment, then click
    <b>"📸 Capture current frame"</b> below to snapshot it.
  </p>
</div>