fix duplicate caption processing (#156)

src/flash-source-buffer.js

@@ -186,8 +186,13 @@ export default class FlashSourceBuffer extends videojs.EventTarget {
       }
     });
 
+    let onHlsReset = this.onHlsReset_.bind(this);
+
+    this.mediaSource_.player_.tech_.on('hls-reset', onHlsReset);
+
     this.mediaSource_.player_.tech_.hls.on('dispose', () => {
       this.transmuxer_.terminate();
+      this.mediaSource_.player_.tech_.off('hls-reset', onHlsReset);
     });
   }
 
@@ -547,4 +552,8 @@ export default class FlashSourceBuffer extends videojs.EventTarget {
 
     return tags;
   }
+
+  onHlsReset_() {
+    this.transmuxer_.postMessage({action: 'resetCaptions'});
+  }
 }

src/flash-transmuxer-worker.js

@@ -76,6 +76,11 @@ class MessageHandlers {
   flush() {
     this.transmuxer.flush();
   }
+
+  resetCaptions() {
+    this.transmuxer.resetCaptions();
+  }
+
 }
 
 /**

src/html-media-source.js

@@ -159,6 +159,14 @@ export default class HtmlMediaSource extends videojs.EventTarget {
       });
     };
 
+    this.onHlsReset_ = () => {
+      this.sourceBuffers.forEach((sourceBuffer) => {
+        if (sourceBuffer.transmuxer_) {
+          sourceBuffer.transmuxer_.postMessage({action: 'resetCaptions'});
+        }
+      });
+    };
+
     // Re-emit MediaSource events on the polyfill
     [
       'sourceopen',
@@ -180,6 +188,8 @@ export default class HtmlMediaSource extends videojs.EventTarget {
 
       this.player_ = videojs(video.parentNode);
 
+      this.player_.tech_.on('hls-reset', this.onHlsReset_);
+
       if (this.player_.audioTracks && this.player_.audioTracks()) {
         this.player_.audioTracks().on('change', this.updateActiveSourceBuffers_);
         this.player_.audioTracks().on('addtrack', this.updateActiveSourceBuffers_);
@@ -230,6 +240,7 @@ export default class HtmlMediaSource extends videojs.EventTarget {
       // event handlers left to unbind anyway
       if (this.player_.el_) {
         this.player_.off('mediachange', this.onPlayerMediachange_);
+        this.player_.tech_.off('hls-reset', this.onHlsReset_);
       }
     });
   }

src/transmuxer-worker.js

@@ -132,6 +132,11 @@ class MessageHandlers {
   flush(data) {
     this.transmuxer.flush();
   }
+
+  resetCaptions() {
+    this.transmuxer.resetCaptions();
+  }
+
 }
 
 /**