--- a/dom/media/MediaCache.cpp
+++ b/dom/media/MediaCache.cpp
@@ -2496,16 +2496,23 @@ MediaCacheStream::Read(char* aBuffer, ui
         if (mCurrentMode == MODE_METADATA) {
           streamWithPartialBlock->mMetadataInPartialBlockBuffer = true;
         }
         streamOffset += bytes;
         count = bytes;
         break;
       }
 
+      if (mStreamOffset != streamOffset) {
+        // Updat mStreamOffset before we drop the lock. We need to run
+        // Update() again since stream reading strategy might have changed.
+        mStreamOffset = streamOffset;
+        mMediaCache->QueueUpdate();
+      }
+
       // No data has been read yet, so block
       mon.Wait();
       if (mClosed) {
         // We may have successfully read some data, but let's just throw
         // that out.
         return NS_ERROR_FAILURE;
       }
       continue;