diff --git a/libraries/transformer/src/main/java/androidx/media3/transformer/AudioSamplePipeline.java b/libraries/transformer/src/main/java/androidx/media3/transformer/AudioSamplePipeline.java
index c70fda5b3a..095cff9cf1 100644
--- a/libraries/transformer/src/main/java/androidx/media3/transformer/AudioSamplePipeline.java
+++ b/libraries/transformer/src/main/java/androidx/media3/transformer/AudioSamplePipeline.java
@@ -26,6 +26,7 @@ import static java.lang.Math.min;
 import androidx.annotation.Nullable;
 import androidx.media3.common.C;
 import androidx.media3.common.Format;
+import androidx.media3.common.MimeTypes;
 import androidx.media3.common.audio.AudioProcessingPipeline;
 import androidx.media3.common.audio.AudioProcessor;
 import androidx.media3.common.audio.AudioProcessor.AudioFormat;
@@ -151,7 +152,10 @@ import org.checkerframework.dataflow.qual.Pure;
       if (isLast) {
         queueEndOfStreamAfterSilence = true;
       }
+      return;
     }
+    checkState(MimeTypes.isAudio(trackFormat.sampleMimeType));
+    checkState(trackFormat.pcmEncoding != Format.NO_VALUE);
   }
 
   @Override
diff --git a/libraries/transformer/src/main/java/androidx/media3/transformer/SequenceAssetLoader.java b/libraries/transformer/src/main/java/androidx/media3/transformer/SequenceAssetLoader.java
index 3fd118e2f0..26b3447ed7 100644
--- a/libraries/transformer/src/main/java/androidx/media3/transformer/SequenceAssetLoader.java
+++ b/libraries/transformer/src/main/java/androidx/media3/transformer/SequenceAssetLoader.java
@@ -231,6 +231,7 @@ import java.util.concurrent.atomic.AtomicInteger;
     if (addForcedAudioTrack) {
       sequenceAssetLoaderListener.onTrackAdded(
           FORCE_AUDIO_TRACK_FORMAT, SUPPORTED_OUTPUT_TYPE_DECODED);
+      decodeAudio = true;
     }
 
     return decodeOutput;