title: How to broadcast mp4 stream
body: <p>I have mp4 stream available over HTTP to single client</p>
  
  <p>How to broadcast it to multiple clients?</p>
  
  <p>I can write code that will read MP4 stream over HTTP and copy to multiple clients.</p>
  
  <p>But is there some initial frame, header in MP4 stream?</p>
  
  <p>May be some framework or existing server can broadcast mp4 stream?</p>