title: Does AVPlayer support live event rewind?
body: <p>I'm using AVPlayer to play streamed content. AFAIK, there are 3 kinds of stream contents</p>
  
  <ol>
  <li>Progressive download: like VOD, this is a complete video. I can rewind &amp; forward and get the duration of the video</li>
  <li>Live streaming: this is like watching a TV channel. I can't get the duration</li>
  <li>Live event: like a football match</li>
  </ol>
  
  <p>Correct me if I'm wrong. </p>
  
  <p>My question is Can AVPlayer work with live event? For example, the football match starts at 7:00AM and is about to last for 2 hours. You open the stream at 8:00AM, can you rewind back? Does the AVPlayer update the duration continuously ?</p>
  
  <p>Also, I found the <code>currentPlaybackTime</code></p>
  
  <blockquote>
    <p>For video-on-demand or progressively downloaded content, this value is
    measured in seconds from the beginning of the current item. Changing
    the value of this property moves the playhead to the new location. For
    content streamed live from a server, this value represents the time
    from the beginning of the playlist when it was first loaded.</p>
  </blockquote>
  
  <p>Not sure what <code>For content streamed live from a server, this value represents the time from the beginning of the playlist when it was first loaded.</code> mean</p>