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Advertised DVR Window does not match available DVR Window

Created by: LloydW93

Steps to reproduce:

  1. Play any live stream, e.g. at http://dashif.org/reference/players/javascript/v2.1.1/samples/dash-if-reference-player/index.html?mpd=http://vm2.dashif.org/livesim-dev/segtimeline_1/testpic_2s/Manifest.mpd
  2. Observe that the control bar in the player UI allows you to seek slightly past the current play time
  3. Attempt to seek to the end of the controls
  4. Note that the player stalls for longer than you'd expect, as the segment you are trying to load is not available yet

DVRInfo events always return times accurate to the second/millisecond, instead of accurate to the segment. This means that the end time is often reported as part way into the next segment, even though the segment will not be available on the server until the full time period it contains is available.