diff --git a/src/js/captions.js b/src/js/captions.js index 04da4651..60381f88 100644 --- a/src/js/captions.js +++ b/src/js/captions.js @@ -133,8 +133,12 @@ const captions = { }); // Turn off native caption rendering to avoid double captions + // Note: mode='hidden' forces a track to download. To ensure every track + // isn't downloaded at once, only 'showing' tracks should be reassigned // eslint-disable-next-line no-param-reassign - track.mode = 'hidden'; + if (track.mode === 'showing') { + track.mode = 'hidden'; + } // Add event listener for cue changes on.call(this, track, 'cuechange', () => captions.updateCues.call(this)); @@ -211,6 +215,14 @@ const captions = { // Trigger event (not used internally) triggerEvent.call(this, this.media, active ? 'captionsenabled' : 'captionsdisabled'); } + + // Wait for the call stack to clear before setting mode='hidden' + // on the active track - forcing the browser to download it + setTimeout(() => { + if (active && this.captions.toggled) { + this.captions.currentTrackNode.mode = 'hidden'; + } + }); }, // Set captions by track index