Destroy FFMPEG WASM workers when the dispose lifecycle event happens

src/js/engine/convert-engine.js

@@ -86,6 +86,13 @@ class ConvertEngine extends Component {
         // download converted file
         downloadBlob(fileName, this.player().convertedData);
     }
+
+    /**
+     * Remove any temporary data and references
+     */
+    dispose() {
+        super.dispose();
+    }
 }
 
 // expose component for external plugins

src/js/plugins/ffmpeg-wasm-plugin.js

@@ -132,6 +132,17 @@ class FFmpegWasmEngine extends ConvertEngine {
         // notify listeners
         this.player().trigger('finishConvert');
     }
+
+    /**
+     * Terminate the FFMPEG workers if they have been started
+     */
+    dispose() {
+        super.dispose();
+        if (this.ffmpeg !== null && this.ffmpeg.loaded) {
+            this.ffmpeg.terminate();
+            this.ffmpeg = null;
+        }
+    }
 }
 
 // expose plugin

src/js/videojs.record.js

@@ -1384,6 +1384,11 @@ class Record extends Plugin {
             this.engine.off(Event.RECORD_COMPLETE, this.engineStopCallback);
         }
 
+        // Clean up any resources the converter engine may have used
+        if (this.converter) {
+            this.converter.dispose();
+        }
+
         // stop recording and device
         this.stop();
         this.stopDevice();

test/engine/convert-engine.spec.js

@@ -62,4 +62,13 @@ describe('engine.convert-engine', () => {
             done();
         });
     });
+
+    it('should call dispose when the player is disposed', (done) => {
+        let engine = new ConvertEngine(player, {});
+        spyOn(engine, 'dispose');
+
+        player.dispose();
+
+        expect(engine.dispose).toHaveBeenCalled();
+    });
 });