diff --git a/lib/hls/hls_parser.js b/lib/hls/hls_parser.js
index 027ad33f1b..98c6f4f43b 100644
--- a/lib/hls/hls_parser.js
+++ b/lib/hls/hls_parser.js
@@ -447,6 +447,14 @@ shaka.hls.HlsParser.prototype.createVariantsForTag_ = function(tag, playlist) {
     height = resBlocks[1];
   }
 
+  codecs = codecs.filter(function(codec) {
+    // mp4a.40.34 is a nonstandard codec string that is sometimes used in HLS
+    // for legacy reasons. It is not recognized by non-Apple MSE.
+    // See https://bugs.chromium.org/p/chromium/issues/detail?id=489520
+    // Therefore, ignore this codec string.
+    return codec != 'mp4a.40.34';
+  });
+
   // After filtering, this is a list of the media tags we will process to
   // combine with the variant tag (EXT-X-STREAM-INF) we are working on.
   var mediaTags = Utils.filterTagsByName(playlist.tags, 'EXT-X-MEDIA');
@@ -1293,6 +1301,10 @@ shaka.hls.HlsParser.prototype.getStartTime_ =
   return this.fetchPartialSegment_(segmentRef).then(function(response) {
     if (mimeType == 'video/mp4' || mimeType == 'audio/mp4') {
       return this.getStartTimeFromMp4Segment_(response.data);
+    } else if (mimeType == 'audio/mpeg') {
+      // There is no standard way to embed a timestamp in an mp3 file, so the
+      // start time is presumably 0.
+      return 0;
     } else if (mimeType == 'video/mp2t') {
       return this.getStartTimeFromTsSegment_(response.data);
     } else if (mimeType == 'application/mp4' ||