diff --git a/libraries/transformer/src/androidTest/java/androidx/media3/transformer/RawAssetLoaderAndroidTest.java b/libraries/transformer/src/androidTest/java/androidx/media3/transformer/RawAssetLoaderAndroidTest.java
index fa4ba1480f..3fc7efd818 100644
--- a/libraries/transformer/src/androidTest/java/androidx/media3/transformer/RawAssetLoaderAndroidTest.java
+++ b/libraries/transformer/src/androidTest/java/androidx/media3/transformer/RawAssetLoaderAndroidTest.java
@@ -101,8 +101,36 @@ public class RawAssetLoaderAndroidTest {
     // See b/324245196.
     // Audio encoders on different API versions seems to output slightly different durations, so add
     // 50ms tolerance.
-    assertThat(exportResult.durationMs).isAtLeast(975);
-    assertThat(exportResult.durationMs).isAtMost(1025);
+    assertThat(exportResult.durationMs).isWithin(25).of(1000);
+  }
+
+  @Test
+  public void audioTranscoding_withRawAudioAndUnsetDuration_completesWithCorrectDuration()
+      throws Exception {
+    SettableFuture<RawAssetLoader> rawAssetLoaderFuture = SettableFuture.create();
+    Transformer transformer =
+        new Transformer.Builder(context)
+            .setAssetLoaderFactory(
+                new TestRawAssetLoaderFactory(
+                    AUDIO_FORMAT, /* videoFormat= */ null, rawAssetLoaderFuture))
+            .build();
+    EditedMediaItem editedMediaItem =
+        new EditedMediaItem.Builder(MediaItem.fromUri(Uri.EMPTY)).build();
+    ListenableFuture<ExportResult> exportCompletionFuture =
+        new TransformerAndroidTestRunner.Builder(context, transformer)
+            .build()
+            .runAsync(testId, editedMediaItem);
+
+    RawAssetLoader rawAssetLoader = rawAssetLoaderFuture.get();
+    feedRawAudioDataToAssetLoader(
+        rawAssetLoader, AUDIO_FORMAT, /* durationUs= */ C.MICROS_PER_SECOND);
+
+    ExportResult exportResult = exportCompletionFuture.get();
+    // The durationMs is the timestamp of the last sample and not the total duration.
+    // See b/324245196.
+    // Audio encoders on different API versions seems to output slightly different durations, so add
+    // 50ms tolerance.
+    assertThat(exportResult.durationMs).isWithin(25).of(1000);
   }
 
   @Test
@@ -242,8 +270,7 @@ public class RawAssetLoaderAndroidTest {
     // See b/324245196.
     // Audio encoders on different API versions seems to output slightly different durations, so add
     // 50ms tolerance.
-    assertThat(exportResult.durationMs).isAtLeast(975);
-    assertThat(exportResult.durationMs).isAtMost(1025);
+    assertThat(exportResult.durationMs).isWithin(25).of(1000);
   }
 
   private void feedRawAudioDataToAssetLoader(
diff --git a/libraries/transformer/src/main/java/androidx/media3/transformer/RawAssetLoader.java b/libraries/transformer/src/main/java/androidx/media3/transformer/RawAssetLoader.java
index 44eac1ef16..0abb48fc25 100644
--- a/libraries/transformer/src/main/java/androidx/media3/transformer/RawAssetLoader.java
+++ b/libraries/transformer/src/main/java/androidx/media3/transformer/RawAssetLoader.java
@@ -23,6 +23,7 @@ import static androidx.media3.transformer.SampleConsumer.INPUT_RESULT_END_OF_STR
 import static androidx.media3.transformer.SampleConsumer.INPUT_RESULT_TRY_AGAIN_LATER;
 import static androidx.media3.transformer.Transformer.PROGRESS_STATE_AVAILABLE;
 import static androidx.media3.transformer.Transformer.PROGRESS_STATE_NOT_STARTED;
+import static androidx.media3.transformer.Transformer.PROGRESS_STATE_UNAVAILABLE;
 import static androidx.media3.transformer.TransformerUtil.getValidColor;
 import static java.lang.Math.min;
 import static java.lang.Math.round;
@@ -96,7 +97,6 @@ public final class RawAssetLoader implements AssetLoader {
       @Nullable Format videoFormat,
       @Nullable OnInputFrameProcessedListener frameProcessedListener) {
     checkArgument(audioFormat != null || videoFormat != null);
-    checkArgument(editedMediaItem.durationUs != C.TIME_UNSET);
     checkArgument(
         videoFormat == null
             || (videoFormat.height != Format.NO_VALUE && videoFormat.width != Format.NO_VALUE));
@@ -119,7 +119,10 @@ public final class RawAssetLoader implements AssetLoader {
 
   @Override
   public void start() {
-    progressState = PROGRESS_STATE_AVAILABLE;
+    progressState =
+        editedMediaItem.durationUs == C.TIME_UNSET
+            ? PROGRESS_STATE_UNAVAILABLE
+            : PROGRESS_STATE_AVAILABLE;
     assetLoaderListener.onDurationUs(editedMediaItem.durationUs);
     // The constructor guarantees at least one track is present.
     int trackCount = 1;
diff --git a/libraries/transformer/src/test/java/androidx/media3/transformer/RawAssetLoaderTest.java b/libraries/transformer/src/test/java/androidx/media3/transformer/RawAssetLoaderTest.java
index 62600d6f4f..e9af7f3a73 100644
--- a/libraries/transformer/src/test/java/androidx/media3/transformer/RawAssetLoaderTest.java
+++ b/libraries/transformer/src/test/java/androidx/media3/transformer/RawAssetLoaderTest.java
@@ -16,6 +16,7 @@
 package androidx.media3.transformer;
 
 import static androidx.media3.transformer.Transformer.PROGRESS_STATE_AVAILABLE;
+import static androidx.media3.transformer.Transformer.PROGRESS_STATE_UNAVAILABLE;
 import static com.google.common.truth.Truth.assertThat;
 import static java.lang.Math.min;
 import static java.lang.Math.round;
@@ -121,6 +122,30 @@ public class RawAssetLoaderTest {
         .isEqualTo(round(audioSamplePresentationTimeUs * 100 / (float) audioDurationUs));
   }
 
+  @Test
+  public void getProgress_withOnlyAudioDataAndUnsetDuration_returnsUnavailableProgress() {
+    long audioSamplePresentationTimeUs = 100;
+    AssetLoader.Listener fakeAssetLoaderListener =
+        new FakeAssetLoaderListener(new FakeAudioSampleConsumer(), /* videoSampleConsumer= */ null);
+    ProgressHolder progressHolder = new ProgressHolder();
+
+    RawAssetLoader rawAssetLoader =
+        new RawAssetLoader(
+            new EditedMediaItem.Builder(new MediaItem.Builder().build()).build(),
+            fakeAssetLoaderListener,
+            FAKE_AUDIO_FORMAT,
+            /* videoFormat= */ null,
+            /* frameProcessedListener= */ null);
+    rawAssetLoader.start();
+    boolean queuedAudioData =
+        rawAssetLoader.queueAudioData(
+            ByteBuffer.wrap(FAKE_AUDIO_DATA), audioSamplePresentationTimeUs, /* isLast= */ false);
+    @Transformer.ProgressState int progressState = rawAssetLoader.getProgress(progressHolder);
+
+    assertThat(queuedAudioData).isTrue();
+    assertThat(progressState).isEqualTo(PROGRESS_STATE_UNAVAILABLE);
+  }
+
   @Test
   public void getProgress_withOnlyVideoData_returnsExpectedProgress() throws ExportException {
     long videoDurationUs = 1_000;