diff --git a/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/AndroidTestUtil.java b/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/AndroidTestUtil.java
index 206687d246..b853519c79 100644
--- a/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/AndroidTestUtil.java
+++ b/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/AndroidTestUtil.java
@@ -22,6 +22,7 @@ import android.os.Build;
 import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.util.Log;
 import java.io.File;
+import java.io.FileWriter;
 import java.io.IOException;
 import java.util.List;
 import org.json.JSONException;
@@ -42,12 +43,22 @@ public final class AndroidTestUtil {
 
   public static final String MP4_REMOTE_4K60_PORTRAIT_URI_STRING =
       "https://storage.googleapis.com/exoplayer-test-media-1/mp4/portrait_4k60.mp4";
-  /* package */ static File createExternalCacheFile(Context context, String fileName)
-      throws IOException {
-    File file = new File(context.getExternalCacheDir(), fileName);
-    checkState(!file.exists() || file.delete(), "Could not delete file: " + file.getAbsolutePath());
-    checkState(file.createNewFile(), "Could not create file: " + file.getAbsolutePath());
-    return file;
+
+  /**
+   * Log in logcat and in an analysis file that this test was skipped.
+   *
+   * <p>Analysis file is a JSON summarising the test, saved to the application cache.
+   *
+   * <p>The analysis json will contain a {@code skipReason} key, with the reason for skipping the
+   * test case.
+   */
+  public static void recordTestSkipped(Context context, String testId, String reason)
+      throws JSONException, IOException {
+    Log.i(testId, reason);
+    JSONObject testJson = new JSONObject();
+    testJson.put("skipReason", reason);
+
+    writeTestSummaryToFile(context, testId, testJson);
   }
 
   /**
@@ -106,5 +117,42 @@ public final class AndroidTestUtil {
     return exceptionJson;
   }
 
+  /**
+   * Writes the summary of a test run to the application cache file.
+   *
+   * <p>The cache filename follows the pattern {@code <testId>-result.txt}.
+   *
+   * @param context The {@link Context}.
+   * @param testId A unique identifier for the transformer test run.
+   * @param testJson A {@link JSONObject} containing a summary of the test run.
+   */
+  /* package */ static void writeTestSummaryToFile(
+      Context context, String testId, JSONObject testJson) throws IOException, JSONException {
+    testJson.put("testId", testId).put("device", getDeviceDetailsAsJsonObject());
+
+    String analysisContents = testJson.toString(/* indentSpaces= */ 2);
+
+    // Log contents as well as writing to file, for easier visibility on individual device testing.
+    Log.i(testId, analysisContents);
+
+    File analysisFile = createExternalCacheFile(context, /* fileName= */ testId + "-result.txt");
+    try (FileWriter fileWriter = new FileWriter(analysisFile)) {
+      fileWriter.write(analysisContents);
+    }
+  }
+
+  /**
+   * Creates a {@link File} of the {@code fileName} in the application cache directory.
+   *
+   * <p>If a file of that name already exists, it is overwritten.
+   */
+  /* package */ static File createExternalCacheFile(Context context, String fileName)
+      throws IOException {
+    File file = new File(context.getExternalCacheDir(), fileName);
+    checkState(!file.exists() || file.delete(), "Could not delete file: " + file.getAbsolutePath());
+    checkState(file.createNewFile(), "Could not create file: " + file.getAbsolutePath());
+    return file;
+  }
+
   private AndroidTestUtil() {}
 }
diff --git a/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformerAndroidTestRunner.java b/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformerAndroidTestRunner.java
index f9bf033b2a..77977da7a0 100644
--- a/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformerAndroidTestRunner.java
+++ b/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformerAndroidTestRunner.java
@@ -26,14 +26,12 @@ import com.google.android.exoplayer2.MediaItem;
 import com.google.android.exoplayer2.util.Log;
 import com.google.android.exoplayer2.util.SystemClock;
 import java.io.File;
-import java.io.FileWriter;
 import java.io.IOException;
 import java.util.Map;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.AtomicReference;
 import org.checkerframework.checker.nullness.compatqual.NullableType;
-import org.json.JSONException;
 import org.json.JSONObject;
 
 /** An android instrumentation test runner for {@link Transformer}. */
@@ -174,7 +172,9 @@ public class TransformerAndroidTestRunner {
    */
   public TransformationTestResult run(String testId, String uriString) throws Exception {
     JSONObject resultJson = new JSONObject();
-    resultJson.put("inputValues", JSONObject.wrap(inputValues));
+    if (inputValues != null) {
+      resultJson.put("inputValues", JSONObject.wrap(inputValues));
+    }
     try {
       TransformationTestResult transformationTestResult = runInternal(testId, uriString);
       resultJson.put("transformationResult", transformationTestResult.asJsonObject());
@@ -186,7 +186,7 @@ public class TransformerAndroidTestRunner {
       resultJson.put("exception", AndroidTestUtil.exceptionAsJsonObject(e));
       throw e;
     } finally {
-      writeTestSummaryToFile(context, testId, resultJson);
+      AndroidTestUtil.writeTestSummaryToFile(context, testId, resultJson);
     }
   }
 
@@ -303,20 +303,4 @@ public class TransformerAndroidTestRunner {
 
     return resultBuilder.build();
   }
-
-  private static void writeTestSummaryToFile(Context context, String testId, JSONObject resultJson)
-      throws IOException, JSONException {
-    resultJson.put("testId", testId).put("device", AndroidTestUtil.getDeviceDetailsAsJsonObject());
-
-    String analysisContents = resultJson.toString(/* indentSpaces= */ 2);
-
-    // Log contents as well as writing to file, for easier visibility on individual device testing.
-    Log.i(TAG_PREFIX + testId, analysisContents);
-
-    File analysisFile =
-        AndroidTestUtil.createExternalCacheFile(context, /* fileName= */ testId + "-result.txt");
-    try (FileWriter fileWriter = new FileWriter(analysisFile)) {
-      fileWriter.write(analysisContents);
-    }
-  }
 }
diff --git a/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/mh/TransformationTest.java b/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/mh/TransformationTest.java
index 51ea018124..f09fab7b7e 100644
--- a/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/mh/TransformationTest.java
+++ b/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/mh/TransformationTest.java
@@ -19,6 +19,7 @@ import static com.google.android.exoplayer2.transformer.AndroidTestUtil.MP4_ASSE
 import static com.google.android.exoplayer2.transformer.AndroidTestUtil.MP4_ASSET_URI_STRING;
 import static com.google.android.exoplayer2.transformer.AndroidTestUtil.MP4_ASSET_WITH_INCREASING_TIMESTAMPS_URI_STRING;
 import static com.google.android.exoplayer2.transformer.AndroidTestUtil.MP4_REMOTE_4K60_PORTRAIT_URI_STRING;
+import static com.google.android.exoplayer2.transformer.AndroidTestUtil.recordTestSkipped;
 
 import android.content.Context;
 import androidx.test.core.app.ApplicationProvider;
@@ -30,7 +31,6 @@ import com.google.android.exoplayer2.transformer.TransformationRequest;
 import com.google.android.exoplayer2.transformer.Transformer;
 import com.google.android.exoplayer2.transformer.TransformerAndroidTestRunner;
 import com.google.android.exoplayer2.transformer.VideoEncoderSettings;
-import com.google.android.exoplayer2.util.Log;
 import com.google.android.exoplayer2.util.Util;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -120,14 +120,17 @@ public class TransformationTest {
   @Test
   public void transformSef() throws Exception {
     String testId = TAG + "_transformSef";
+    Context context = ApplicationProvider.getApplicationContext();
 
     if (Util.SDK_INT < 25) {
       // TODO(b/210593256): Remove test skipping after removing the MediaMuxer dependency.
-      Log.i(testId, "Skipping on this API version due to lack of muxing support");
+      recordTestSkipped(
+          context,
+          testId,
+          /* reason= */ "Skipping on this API version due to lack of muxing support");
       return;
     }
 
-    Context context = ApplicationProvider.getApplicationContext();
     Transformer transformer =
         new Transformer.Builder(context)
             .setTransformationRequest(