diff --git a/libraries/transformer/src/main/java/androidx/media3/transformer/Composition.java b/libraries/transformer/src/main/java/androidx/media3/transformer/Composition.java
index 4fc5a5d77c..0b0d784e65 100644
--- a/libraries/transformer/src/main/java/androidx/media3/transformer/Composition.java
+++ b/libraries/transformer/src/main/java/androidx/media3/transformer/Composition.java
@@ -20,6 +20,7 @@ import static androidx.media3.common.util.Assertions.checkArgument;
 import androidx.media3.common.MediaItem;
 import androidx.media3.common.util.UnstableApi;
 import com.google.common.collect.ImmutableList;
+import java.util.List;
 
 /**
  * A composition of {@link MediaItem} instances, with transformations to apply to them.
@@ -46,9 +47,9 @@ public final class Composition {
    * @param sequences The {@link #sequences}.
    * @param effects The {@link #effects}.
    */
-  public Composition(ImmutableList<EditedMediaItemSequence> sequences, Effects effects) {
+  public Composition(List<EditedMediaItemSequence> sequences, Effects effects) {
     checkArgument(!sequences.isEmpty());
-    this.sequences = sequences;
+    this.sequences = ImmutableList.copyOf(sequences);
     this.effects = effects;
   }
 }
diff --git a/libraries/transformer/src/main/java/androidx/media3/transformer/EditedMediaItemSequence.java b/libraries/transformer/src/main/java/androidx/media3/transformer/EditedMediaItemSequence.java
index 28a1ce3313..63e415279c 100644
--- a/libraries/transformer/src/main/java/androidx/media3/transformer/EditedMediaItemSequence.java
+++ b/libraries/transformer/src/main/java/androidx/media3/transformer/EditedMediaItemSequence.java
@@ -19,6 +19,7 @@ import static androidx.media3.common.util.Assertions.checkArgument;
 
 import androidx.media3.common.util.UnstableApi;
 import com.google.common.collect.ImmutableList;
+import java.util.List;
 
 /**
  * A sequence of {@link EditedMediaItem} instances.
@@ -40,8 +41,8 @@ public final class EditedMediaItemSequence {
    *
    * @param editedMediaItems The {@link #editedMediaItems}.
    */
-  public EditedMediaItemSequence(ImmutableList<EditedMediaItem> editedMediaItems) {
+  public EditedMediaItemSequence(List<EditedMediaItem> editedMediaItems) {
     checkArgument(!editedMediaItems.isEmpty());
-    this.editedMediaItems = editedMediaItems;
+    this.editedMediaItems = ImmutableList.copyOf(editedMediaItems);
   }
 }
diff --git a/libraries/transformer/src/main/java/androidx/media3/transformer/Effects.java b/libraries/transformer/src/main/java/androidx/media3/transformer/Effects.java
index dd7afe8f02..e984703223 100644
--- a/libraries/transformer/src/main/java/androidx/media3/transformer/Effects.java
+++ b/libraries/transformer/src/main/java/androidx/media3/transformer/Effects.java
@@ -22,6 +22,7 @@ import androidx.media3.common.audio.AudioProcessor;
 import androidx.media3.common.util.UnstableApi;
 import androidx.media3.effect.GlEffectsFrameProcessor;
 import com.google.common.collect.ImmutableList;
+import java.util.List;
 
 /** Effects to apply to a {@link MediaItem}. */
 @UnstableApi
@@ -52,11 +53,10 @@ public final class Effects {
   /**
    * Creates an instance using a {@link GlEffectsFrameProcessor.Factory}.
    *
-   * <p>This is equivalent to calling {@link Effects#Effects(ImmutableList, ImmutableList,
-   * FrameProcessor.Factory)} with a {@link GlEffectsFrameProcessor.Factory}.
+   * <p>This is equivalent to calling {@link Effects#Effects(List, List, FrameProcessor.Factory)}
+   * with a {@link GlEffectsFrameProcessor.Factory}.
    */
-  public Effects(
-      ImmutableList<AudioProcessor> audioProcessors, ImmutableList<Effect> videoEffects) {
+  public Effects(List<AudioProcessor> audioProcessors, List<Effect> videoEffects) {
     this(audioProcessors, videoEffects, new GlEffectsFrameProcessor.Factory());
   }
 
@@ -68,11 +68,11 @@ public final class Effects {
    * @param frameProcessorFactory The {@link #frameProcessorFactory}.
    */
   public Effects(
-      ImmutableList<AudioProcessor> audioProcessors,
-      ImmutableList<Effect> videoEffects,
+      List<AudioProcessor> audioProcessors,
+      List<Effect> videoEffects,
       FrameProcessor.Factory frameProcessorFactory) {
-    this.audioProcessors = audioProcessors;
-    this.videoEffects = videoEffects;
+    this.audioProcessors = ImmutableList.copyOf(audioProcessors);
+    this.videoEffects = ImmutableList.copyOf(videoEffects);
     this.frameProcessorFactory = frameProcessorFactory;
   }
 }