diff --git a/libraries/transformer/src/main/java/androidx/media3/transformer/Mp4ExtractorWrapper.java b/libraries/transformer/src/main/java/androidx/media3/transformer/Mp4ExtractorWrapper.java
index 88e2f9c3f9..8908f9a624 100644
--- a/libraries/transformer/src/main/java/androidx/media3/transformer/Mp4ExtractorWrapper.java
+++ b/libraries/transformer/src/main/java/androidx/media3/transformer/Mp4ExtractorWrapper.java
@@ -104,13 +104,18 @@ import org.checkerframework.checker.nullness.qual.Nullable;
     }
   }
 
-  /** Returns the presentation timestamp (in microseconds) of the last sync sample. */
+  /**
+   * Returns the presentation timestamp (in microseconds) of the last sync sample or {@link
+   * C#TIME_UNSET} if there is no video track.
+   */
   public long getLastSyncSampleTimestampUs() {
     checkState(initialized);
 
+    if (extractorOutput.videoTrackId == C.INDEX_UNSET) {
+      return C.TIME_UNSET;
+    }
     long durationUs = mp4Extractor.getDurationUs();
     checkState(durationUs != C.TIME_UNSET);
-    checkState(extractorOutput.videoTrackId != C.INDEX_UNSET);
     SeekMap.SeekPoints seekPoints =
         mp4Extractor.getSeekPoints(durationUs, extractorOutput.videoTrackId);
     return seekPoints.first.timeUs;
diff --git a/libraries/transformer/src/test/java/androidx/media3/transformer/Mp4ExtractorWrapperTest.java b/libraries/transformer/src/test/java/androidx/media3/transformer/Mp4ExtractorWrapperTest.java
index 42c2105b2c..41339e44e2 100644
--- a/libraries/transformer/src/test/java/androidx/media3/transformer/Mp4ExtractorWrapperTest.java
+++ b/libraries/transformer/src/test/java/androidx/media3/transformer/Mp4ExtractorWrapperTest.java
@@ -19,6 +19,7 @@ import static com.google.common.truth.Truth.assertThat;
 import static org.junit.Assert.assertThrows;
 
 import android.content.Context;
+import androidx.media3.common.C;
 import androidx.test.core.app.ApplicationProvider;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import java.io.IOException;
@@ -35,7 +36,7 @@ public class Mp4ExtractorWrapperTest {
   private final Context context = ApplicationProvider.getApplicationContext();
 
   @Test
-  public void initialize_withEmptyFile_throws() throws IOException {
+  public void init_withEmptyFile_throws() throws IOException {
     String emptyFilePath = temporaryFolder.newFile("EmptyFile").getPath();
     Mp4ExtractorWrapper mp4ExtractorWrapper = new Mp4ExtractorWrapper(context, emptyFilePath);
 
@@ -43,7 +44,7 @@ public class Mp4ExtractorWrapperTest {
   }
 
   @Test
-  public void initialize_withNonMp4File_throws() {
+  public void init_withNonMp4File_throws() {
     String mp4FilePath = "asset:///media/mkv/sample.mkv";
     Mp4ExtractorWrapper mp4ExtractorWrapper = new Mp4ExtractorWrapper(context, mp4FilePath);
 
@@ -51,7 +52,8 @@ public class Mp4ExtractorWrapperTest {
   }
 
   @Test
-  public void getLastSyncSampleTimestamp_ofSmallMp4File_outputsFirstTimestamp() throws IOException {
+  public void getLastSyncSampleTimestampUs_ofSmallMp4File_outputsFirstTimestamp()
+      throws IOException {
     String mp4FilePath = "asset:///media/mp4/sample.mp4";
     Mp4ExtractorWrapper mp4ExtractorWrapper = new Mp4ExtractorWrapper(context, mp4FilePath);
     mp4ExtractorWrapper.init();
@@ -63,7 +65,7 @@ public class Mp4ExtractorWrapperTest {
   }
 
   @Test
-  public void getLastSyncSampleTimestamp_ofMp4File_outputMatchesExpected() throws IOException {
+  public void getLastSyncSampleTimestampUs_ofMp4File_outputMatchesExpected() throws IOException {
     String mp4FilePath = "asset:///media/mp4/hdr10-720p.mp4";
     Mp4ExtractorWrapper mp4ExtractorWrapper = new Mp4ExtractorWrapper(context, mp4FilePath);
     mp4ExtractorWrapper.init();
@@ -75,11 +77,12 @@ public class Mp4ExtractorWrapperTest {
   }
 
   @Test
-  public void getLastSyncSampleTimestamp_ofAudioOnlyMp4File_throws() throws IOException {
+  public void getLastSyncSampleTimestampUs_ofAudioOnlyMp4File_returnsUnsetValue()
+      throws IOException {
     String mp4FilePath = "asset:///media/mp4/sample_ac3.mp4";
     Mp4ExtractorWrapper mp4ExtractorWrapper = new Mp4ExtractorWrapper(context, mp4FilePath);
     mp4ExtractorWrapper.init();
 
-    assertThrows(IllegalStateException.class, mp4ExtractorWrapper::getLastSyncSampleTimestampUs);
+    assertThat(mp4ExtractorWrapper.getLastSyncSampleTimestampUs()).isEqualTo(C.TIME_UNSET);
   }
 }