diff --git a/lib/util/stream_utils.js b/lib/util/stream_utils.js
index 9f3ffb96ab..8dc7de6105 100644
--- a/lib/util/stream_utils.js
+++ b/lib/util/stream_utils.js
@@ -450,12 +450,16 @@ shaka.util.StreamUtils = class {
           if (!MediaSource.isTypeSupported(audioFullType)) {
             return false;
           }
+          // Update the codec string with the (possibly) converted codecs.
+          videoCodecs = [videoCodecs, audioCodecs].join(',');
         }
         const fullType = shaka.util.MimeUtils.getFullOrConvertedType(
             video.mimeType, videoCodecs, ContentType.VIDEO);
         if (!MediaSource.isTypeSupported(fullType)) {
           return false;
         }
+        // Update the codec string with the (possibly) converted codecs.
+        video.codecs = videoCodecs;
       }
       const audio = variant.audio;
       if (audio) {
@@ -466,6 +470,8 @@ shaka.util.StreamUtils = class {
         if (!MediaSource.isTypeSupported(fullType)) {
           return false;
         }
+        // Update the codec string with the (possibly) converted codecs.
+        audio.codecs = codecs;
       }
 
       // See: https://github.com/shaka-project/shaka-player/issues/3380