title: Adaptive Streaming player playlist update interval
body: <p>Regarding the behavior of an adaptive streaming player (concretely I'm interested in HLS and DASH), how often should it reload the playlist? Is this specified or up to the player implementation? </p>
  
  <p>When it reloads the playlist, is it done only for the so-called variant playlist or also the master is every time reloaded?</p>
  
  <p>Is this different for live and for on demand content?</p>