enabled in
 cases where the content length (and hence the duration of the media) is unknown. Application
 code should ensure that requested seek positions are valid when using this flag, or be ready to
 handle playback failures reported through <a href="../../Player.Listener.html#onPlayerError(com.google.android.exoplayer2.PlaybackException)"><code>Player.Listener.onPlayerError(com.google.android.exoplayer2.PlaybackException)</code></a> with <a href="../../PlaybackException.html#errorCode"><code>PlaybackExc