diff --git a/demos/transformer/src/main/java/androidx/media3/demo/transformer/TransformerActivity.java b/demos/transformer/src/main/java/androidx/media3/demo/transformer/TransformerActivity.java
index 16eb49a7d4..d5d2a11a91 100644
--- a/demos/transformer/src/main/java/androidx/media3/demo/transformer/TransformerActivity.java
+++ b/demos/transformer/src/main/java/androidx/media3/demo/transformer/TransformerActivity.java
@@ -190,6 +190,7 @@ public final class TransformerActivity extends AppCompatActivity {
       throw new IllegalStateException(e);
     }
     informationTextView.setText(R.string.transformation_started);
+    progressViewGroup.setVisibility(View.VISIBLE);
     inputCardView.setVisibility(View.GONE);
     outputPlayerView.setVisibility(View.GONE);
     Handler mainHandler = new Handler(getMainLooper());