Commits on May 11, 2022

1. fix: Fix VTT cue timing in HLS …

   Since the transition to sequence mode for HLS in v4.0.0, VTT cue
   timings were broken.  This is mainly because VTT cue timing in HLS is
   meant to be based on an offset from the media timestamps, and we
   generally don't know those now that we use sequence mode.
   
   To fix it, this change uses MediaSource segment mode for the very
   first video segment as a way to extract the timestamp, then clears the
   buffer, switches to sequence mode, and appends it again.  This lets us
   get the timing data we need, while avoiding major drawbacks of the
   previous HLS implementation:
    - We don't need to fetch segments upfront (which is high latency)
    - We don't need to fetch segments twice (once for timestamps, and
      once again to buffer)
    - We don't need to maintain parsers (which were complex and limited
      the formats we could support)
   
   Closes shaka-project#4191

   

   joeyparrish committed May 11, 2022
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   ba0be14 View commit details

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2. drop default mode setting, reword comment block

   

   joeyparrish committed May 11, 2022
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   f9d7e38 View commit details

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