Merge pull request #615 from videojs/fix-flash-bandwidth

Fix the IE11 bug without introducing a massive bandwidth leak into Flash playback

@@ -323,8 +323,8 @@ const filterBufferedRanges = function(predicate) {
     // report a fully empty buffer until SourceBuffers have been created
     // which is after a segment has been loaded and transmuxed.
     if (!this.mediaSource ||
-        !this.mediaSource.mediaSource_ ||
-        !this.mediaSource.mediaSource_.sourceBuffers.length) {
+        (this.mediaSource.mediaSource_ &&
+        !this.mediaSource.mediaSource_.sourceBuffers.length)) {
       return videojs.createTimeRanges([]);
     }
 

@@ -752,7 +752,7 @@ QUnit.test('starts downloading a segment on loadedmetadata', function() {
                     'the first segment is requested');
 });
 
-QUnit.test('always returns an empty buffered region when there are no SourceBuffers', function() {
+QUnit.test('return an empty buffered region when there are no SourceBuffers but a real MediaSource exists', function() {
   this.player.src({
     src: 'manifest/media.m3u8',
     type: 'application/vnd.apple.mpegurl'
@@ -778,11 +778,11 @@ QUnit.test('always returns an empty buffered region when there are no SourceBuff
               0,
               'empty TimeRanges returned');
 
-   // Simulate the condition with no media source
+   // Simulate the condition with no media source (ie. Flash)
   delete this.player.hls.mediaSource.mediaSource_;
 
-  QUnit.equal(this.player.tech_.hls.findBufferedRange_().length,
-              0,
+  QUnit.equal(this.player.tech_.hls.findBufferedRange_().end(0),
+              10,
               'empty TimeRanges returned');
 });