diff --git a/lib/media/streaming_engine.js b/lib/media/streaming_engine.js
index d643cef62f..b7f2cc8908 100644
--- a/lib/media/streaming_engine.js
+++ b/lib/media/streaming_engine.js
@@ -1903,8 +1903,10 @@ shaka.media.StreamingEngine = class {
         reference.startTime <= appendWindowEnd,
         logPrefix + ' segment should start before append window end');
 
-    const codecs = MimeUtils.getCodecBase(mediaState.stream.codecs);
-    const mimeType = MimeUtils.getBasicType(mediaState.stream.mimeType);
+    const codecs = MimeUtils.getCodecBase(
+        reference.codecs || mediaState.stream.codecs);
+    const mimeType = MimeUtils.getBasicType(
+        reference.mimeType || mediaState.stream.mimeType);
     const timestampOffset = reference.timestampOffset;
     if (timestampOffset != mediaState.lastTimestampOffset ||
         appendWindowStart != mediaState.lastAppendWindowStart ||