fix: appendsdone abort and handle multiple id3 sections. (#971)

appendsdone may cause an abort in segmentloaders which can then cause pendingSegment to be null after we just null checked it. Instead we should check if we have a pendingSegment then trigger appends done and see if an abort happens.

We also want to make sure that if audio contains multiple id3 sections, we support playing back to it as we did in previos versions of VHS.

package.json

@@ -57,12 +57,12 @@
   ],
   "dependencies": {
     "@babel/runtime": "^7.5.5",
-    "@videojs/vhs-utils": "^2.2.0",
+    "@videojs/vhs-utils": "^2.2.1",
     "aes-decrypter": "3.0.2",
     "global": "^4.3.2",
     "m3u8-parser": "4.4.3",
     "mpd-parser": "0.12.0",
-    "mux.js": "5.6.6",
+    "mux.js": "5.6.7",
     "video.js": "^6 || ^7"
   },
   "devDependencies": {

src/segment-loader.js

@@ -2530,6 +2530,11 @@ export default class SegmentLoader extends videojs.EventTarget {
    * @private
    */
   handleAppendsDone_() {
+    // appendsdone can cause an abort
+    if (this.pendingSegment_) {
+      this.trigger('appendsdone');
+    }
+
     if (!this.pendingSegment_) {
       this.state = 'READY';
       // TODO should this move into this.checkForAbort to speed up requests post abort in
@@ -2540,8 +2545,6 @@ export default class SegmentLoader extends videojs.EventTarget {
       return;
     }
 
-    this.trigger('appendsdone');
-
     const segmentInfo = this.pendingSegment_;
 
     // Now that the end of the segment has been reached, we can set the end time. It's