diff --git a/demos/transformer/src/main/java/com/google/android/exoplayer2/transformerdemo/ConfigurationActivity.java b/demos/transformer/src/main/java/com/google/android/exoplayer2/transformerdemo/ConfigurationActivity.java
index 06d72f9200..0837c98f47 100644
--- a/demos/transformer/src/main/java/com/google/android/exoplayer2/transformerdemo/ConfigurationActivity.java
+++ b/demos/transformer/src/main/java/com/google/android/exoplayer2/transformerdemo/ConfigurationActivity.java
@@ -69,6 +69,7 @@ public final class ConfigurationActivity extends AppCompatActivity {
   public static final String TRIM_END_MS = "trim_end_ms";
   public static final String ENABLE_FALLBACK = "enable_fallback";
   public static final String ENABLE_DEBUG_PREVIEW = "enable_debug_preview";
+  public static final String ABORT_SLOW_TRANSFORMATION = "abort_slow_transformation";
   public static final String HDR_MODE = "hdr_mode";
   public static final String DEMO_EFFECTS_SELECTIONS = "demo_effects_selections";
   public static final String PERIODIC_VIGNETTE_CENTER_X = "periodic_vignette_center_x";
@@ -164,6 +165,7 @@ public final class ConfigurationActivity extends AppCompatActivity {
   private @MonotonicNonNull CheckBox trimCheckBox;
   private @MonotonicNonNull CheckBox enableFallbackCheckBox;
   private @MonotonicNonNull CheckBox enableDebugPreviewCheckBox;
+  private @MonotonicNonNull CheckBox abortSlowTransformationCheckBox;
   private @MonotonicNonNull Spinner hdrModeSpinner;
   private @MonotonicNonNull Button selectDemoEffectsButton;
   private boolean @MonotonicNonNull [] demoEffectsSelections;
@@ -257,6 +259,8 @@ public final class ConfigurationActivity extends AppCompatActivity {
     enableFallbackCheckBox = findViewById(R.id.enable_fallback_checkbox);
     enableDebugPreviewCheckBox = findViewById(R.id.enable_debug_preview_checkbox);
 
+    abortSlowTransformationCheckBox = findViewById(R.id.abort_slow_transformation_checkbox);
+
     ArrayAdapter<String> hdrModeAdapter =
         new ArrayAdapter<>(/* context= */ this, R.layout.spinner_item);
     hdrModeAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
@@ -319,6 +323,7 @@ public final class ConfigurationActivity extends AppCompatActivity {
     "trimCheckBox",
     "enableFallbackCheckBox",
     "enableDebugPreviewCheckBox",
+    "abortSlowTransformationCheckBox",
     "hdrModeSpinner",
     "demoEffectsSelections"
   })
@@ -357,6 +362,7 @@ public final class ConfigurationActivity extends AppCompatActivity {
     }
     bundle.putBoolean(ENABLE_FALLBACK, enableFallbackCheckBox.isChecked());
     bundle.putBoolean(ENABLE_DEBUG_PREVIEW, enableDebugPreviewCheckBox.isChecked());
+    bundle.putBoolean(ABORT_SLOW_TRANSFORMATION, abortSlowTransformationCheckBox.isChecked());
     String selectedhdrMode = String.valueOf(hdrModeSpinner.getSelectedItem());
     bundle.putInt(HDR_MODE, checkNotNull(HDR_MODE_DESCRIPTIONS.get(selectedhdrMode)));
     bundle.putBooleanArray(DEMO_EFFECTS_SELECTIONS, demoEffectsSelections);
diff --git a/demos/transformer/src/main/java/com/google/android/exoplayer2/transformerdemo/TransformerActivity.java b/demos/transformer/src/main/java/com/google/android/exoplayer2/transformerdemo/TransformerActivity.java
index 8e854517a0..c780e6e3ac 100644
--- a/demos/transformer/src/main/java/com/google/android/exoplayer2/transformerdemo/TransformerActivity.java
+++ b/demos/transformer/src/main/java/com/google/android/exoplayer2/transformerdemo/TransformerActivity.java
@@ -49,6 +49,7 @@ import com.google.android.exoplayer2.effect.RgbFilter;
 import com.google.android.exoplayer2.effect.RgbMatrix;
 import com.google.android.exoplayer2.effect.SingleColorLut;
 import com.google.android.exoplayer2.transformer.DefaultEncoderFactory;
+import com.google.android.exoplayer2.transformer.DefaultMuxer;
 import com.google.android.exoplayer2.transformer.ProgressHolder;
 import com.google.android.exoplayer2.transformer.TransformationException;
 import com.google.android.exoplayer2.transformer.TransformationRequest;
@@ -285,7 +286,13 @@ public final class TransformerActivity extends AppCompatActivity {
       if (bundle.getBoolean(ConfigurationActivity.ENABLE_DEBUG_PREVIEW)) {
         transformerBuilder.setDebugViewProvider(new DemoDebugViewProvider());
       }
+
+      if (!bundle.getBoolean(ConfigurationActivity.ABORT_SLOW_TRANSFORMATION)) {
+        transformerBuilder.setMuxerFactory(
+            new DefaultMuxer.Factory(/* maxDelayBetweenSamplesMs= */ C.TIME_UNSET));
+      }
     }
+
     return transformerBuilder
         .addListener(
             new Transformer.Listener() {
diff --git a/demos/transformer/src/main/res/layout/configuration_activity.xml b/demos/transformer/src/main/res/layout/configuration_activity.xml
index f652bb8a5c..f78f57fee9 100644
--- a/demos/transformer/src/main/res/layout/configuration_activity.xml
+++ b/demos/transformer/src/main/res/layout/configuration_activity.xml
@@ -197,6 +197,15 @@
           android:layout_gravity="end"
           android:checked="true"/>
       </TableRow>
+      <TableRow
+        android:layout_weight="1">
+        <TextView
+          android:layout_gravity="center_vertical"
+          android:text="@string/abort_slow_transformation" />
+        <CheckBox
+          android:id="@+id/abort_slow_transformation_checkbox"
+          android:layout_gravity="end"/>
+      </TableRow>
       <TableRow
         android:layout_weight="1"
         android:gravity="center_vertical" >
diff --git a/demos/transformer/src/main/res/values/strings.xml b/demos/transformer/src/main/res/values/strings.xml
index 4ea1fe46a7..0e4fb6e739 100644
--- a/demos/transformer/src/main/res/values/strings.xml
+++ b/demos/transformer/src/main/res/values/strings.xml
@@ -29,6 +29,7 @@
   <string name="rotate" translatable="false">Rotate video (degrees)</string>
   <string name="enable_fallback" translatable="false">Enable fallback</string>
   <string name="enable_debug_preview" translatable="false">Enable debug preview</string>
+  <string name="abort_slow_transformation" translatable="false">Abort slow transformation</string>
   <string name="trim" translatable="false">Trim</string>
   <string name="hdr_mode" translatable="false">HDR mode</string>
   <string name="select_demo_effects" translatable="false">Add demo effects</string>