title: html how to update video src url's parameter without affect the playing video?
body: <p>I have video hosted on cdn, and protected by the access control with timestamp sign parameter like below url</p>
  <pre><code>http://example.com/xxx.mp4?sign=bac9f2b32330d79d97c7022f2518&amp;t=61df9fc7
  </code></pre>
  <p>When the video is very long, the sign will expired. So I need to update the sign.</p>
  <p>So I change the sign every time before it expire and change the video's src. But it will lead the video stop play and back to the begin.</p>