diff --git a/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/FileUtil.java b/libraries/test_utils/src/main/java/androidx/media3/test/utils/FileUtil.java
similarity index 95%
rename from libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/FileUtil.java
rename to libraries/test_utils/src/main/java/androidx/media3/test/utils/FileUtil.java
index 63a6f460c4..01e8101604 100644
--- a/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/FileUtil.java
+++ b/libraries/test_utils/src/main/java/androidx/media3/test/utils/FileUtil.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package androidx.media3.transformer.mh;
+package androidx.media3.test.utils;
 
 import static com.google.common.truth.Truth.assertThat;
 
@@ -25,12 +25,14 @@ import androidx.media3.common.ColorInfo;
 import androidx.media3.common.Format;
 import androidx.media3.common.MediaItem;
 import androidx.media3.common.TrackGroup;
+import androidx.media3.common.util.UnstableApi;
 import androidx.media3.exoplayer.MetadataRetriever;
 import androidx.media3.exoplayer.source.TrackGroupArray;
 import java.util.concurrent.ExecutionException;
 
 /** Utilities for accessing details of media files. */
-/* package */ class FileUtil {
+@UnstableApi
+public final class FileUtil {
 
   /**
    * Asserts that the file has a certain color transfer.
diff --git a/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/ForceInterpretHdrVideoAsSdrTest.java b/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/ForceInterpretHdrVideoAsSdrTest.java
index fcb5ed47fc..06bb651a67 100644
--- a/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/ForceInterpretHdrVideoAsSdrTest.java
+++ b/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/ForceInterpretHdrVideoAsSdrTest.java
@@ -16,13 +16,13 @@
 package androidx.media3.transformer.mh;
 
 import static androidx.media3.common.util.Util.SDK_INT;
+import static androidx.media3.test.utils.FileUtil.assertFileHasColorTransfer;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_1080P_5_SECOND_HLG10;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_1080P_5_SECOND_HLG10_FORMAT;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_720P_4_SECOND_HDR10;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_720P_4_SECOND_HDR10_FORMAT;
 import static androidx.media3.transformer.AndroidTestUtil.recordTestSkipped;
 import static androidx.media3.transformer.AndroidTestUtil.skipAndLogIfFormatsUnsupported;
-import static androidx.media3.transformer.mh.FileUtil.assertFileHasColorTransfer;
 
 import android.content.Context;
 import android.net.Uri;
diff --git a/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/HdrEditingTest.java b/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/HdrEditingTest.java
index bc598c8a83..df054fe3c1 100644
--- a/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/HdrEditingTest.java
+++ b/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/HdrEditingTest.java
@@ -16,6 +16,7 @@
 package androidx.media3.transformer.mh;
 
 import static androidx.media3.common.MimeTypes.VIDEO_H265;
+import static androidx.media3.test.utils.FileUtil.assertFileHasColorTransfer;
 import static androidx.media3.transformer.AndroidTestUtil.FORCE_TRANSCODE_VIDEO_EFFECTS;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_1080P_5_SECOND_HLG10;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_1080P_5_SECOND_HLG10_FORMAT;
@@ -26,7 +27,6 @@ import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_DOLBY_VISION
 import static androidx.media3.transformer.AndroidTestUtil.recordTestSkipped;
 import static androidx.media3.transformer.Composition.HDR_MODE_KEEP_HDR;
 import static androidx.media3.transformer.Composition.HDR_MODE_TONE_MAP_HDR_TO_SDR_USING_OPEN_GL;
-import static androidx.media3.transformer.mh.FileUtil.assertFileHasColorTransfer;
 import static com.google.common.truth.Truth.assertThat;
 
 import android.content.Context;
diff --git a/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/ToneMapHdrToSdrUsingMediaCodecTest.java b/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/ToneMapHdrToSdrUsingMediaCodecTest.java
index 2c3c3f13fa..e8ddde4b7e 100644
--- a/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/ToneMapHdrToSdrUsingMediaCodecTest.java
+++ b/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/ToneMapHdrToSdrUsingMediaCodecTest.java
@@ -15,12 +15,12 @@
  */
 package androidx.media3.transformer.mh;
 
+import static androidx.media3.test.utils.FileUtil.assertFileHasColorTransfer;
 import static androidx.media3.transformer.AndroidTestUtil.FORCE_TRANSCODE_VIDEO_EFFECTS;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_1080P_5_SECOND_HLG10;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_1080P_5_SECOND_HLG10_FORMAT;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_720P_4_SECOND_HDR10;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_720P_4_SECOND_HDR10_FORMAT;
-import static androidx.media3.transformer.mh.FileUtil.assertFileHasColorTransfer;
 import static com.google.common.truth.Truth.assertThat;
 
 import android.content.Context;
diff --git a/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/ToneMapHdrToSdrUsingOpenGlTest.java b/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/ToneMapHdrToSdrUsingOpenGlTest.java
index 94d7e4ca1f..57adf2f589 100644
--- a/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/ToneMapHdrToSdrUsingOpenGlTest.java
+++ b/libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/ToneMapHdrToSdrUsingOpenGlTest.java
@@ -15,13 +15,13 @@
  */
 package androidx.media3.transformer.mh;
 
+import static androidx.media3.test.utils.FileUtil.assertFileHasColorTransfer;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_1080P_5_SECOND_HLG10;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_1080P_5_SECOND_HLG10_FORMAT;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_720P_4_SECOND_HDR10;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_720P_4_SECOND_HDR10_FORMAT;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_DOLBY_VISION_HDR;
 import static androidx.media3.transformer.AndroidTestUtil.MP4_ASSET_DOLBY_VISION_HDR_FORMAT;
-import static androidx.media3.transformer.mh.FileUtil.assertFileHasColorTransfer;
 import static androidx.media3.transformer.mh.HdrCapabilitiesUtil.skipAndLogIfOpenGlToneMappingUnsupported;
 
 import android.content.Context;