Commits on Nov 4, 2019

1. Option to load text tracks on demand vs preload …

   Reimplementation of videojs#2192
   on current code. Seems to work but has not been carefully tested,
   especially on conditions such as slow networks and complex tracks.
   
   For videojs#5252
   
   A `preloadTextTracks` tech option is added, set to true by default,
   to keep current behavior intact. Alternate behavior can be enabled
   by setting this to false.
   
   This delays loading of the VTT cue files until they are selected.
   For sites like Wikipedia that tend to have large numbers of
   crowdsourced subtitles and can show many files together on one
   page, this saves a lot of unnecessary network transfer and API
   hits.
   
   Does mean there may be dropped cues while switching to a track
   that requires on-demand loading.
   
   Example usage:
   
   videojs(element, {
     html5: {
       preloadTextTracks: false
     }
   };

   

   bvibber committed Nov 4, 2019
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