diff --git a/library/common/src/main/java/com/google/android/exoplayer2/Timeline.java b/library/common/src/main/java/com/google/android/exoplayer2/Timeline.java
index 93d57119a1..79d21ab048 100644
--- a/library/common/src/main/java/com/google/android/exoplayer2/Timeline.java
+++ b/library/common/src/main/java/com/google/android/exoplayer2/Timeline.java
@@ -613,7 +613,14 @@ public abstract class Timeline implements Bundleable {
         int windowIndex,
         long durationUs,
         long positionInWindowUs) {
-      return set(id, uid, windowIndex, durationUs, positionInWindowUs, AdPlaybackState.NONE);
+      return set(
+          id,
+          uid,
+          windowIndex,
+          durationUs,
+          positionInWindowUs,
+          AdPlaybackState.NONE,
+          /* isPlaceholder= */ false);
     }
 
     /**
@@ -631,6 +638,8 @@ public abstract class Timeline implements Bundleable {
      *     period is not within the window.
      * @param adPlaybackState The state of the period's ads, or {@link AdPlaybackState#NONE} if
      *     there are no ads.
+     * @param isPlaceholder Whether this period contains placeholder information because the real
+     *     information has yet to be loaded.
      * @return This period, for convenience.
      */
     public Period set(
@@ -639,14 +648,15 @@ public abstract class Timeline implements Bundleable {
         int windowIndex,
         long durationUs,
         long positionInWindowUs,
-        AdPlaybackState adPlaybackState) {
+        AdPlaybackState adPlaybackState,
+        boolean isPlaceholder) {
       this.id = id;
       this.uid = uid;
       this.windowIndex = windowIndex;
       this.durationUs = durationUs;
       this.positionInWindowUs = positionInWindowUs;
       this.adPlaybackState = adPlaybackState;
-      this.isPlaceholder = false;
+      this.isPlaceholder = isPlaceholder;
       return this;
     }
 
@@ -890,8 +900,8 @@ public abstract class Timeline implements Bundleable {
           windowIndex,
           durationUs,
           positionInWindowUs,
-          adPlaybackState);
-      period.isPlaceholder = isPlaceholder;
+          adPlaybackState,
+          isPlaceholder);
       return period;
     }
 
@@ -1469,8 +1479,14 @@ public abstract class Timeline implements Bundleable {
     @Override
     public Period getPeriod(int periodIndex, Period period, boolean ignoredSetIds) {
       Period p = periods.get(periodIndex);
-      period.set(p.id, p.uid, p.windowIndex, p.durationUs, p.positionInWindowUs, p.adPlaybackState);
-      period.isPlaceholder = p.isPlaceholder;
+      period.set(
+          p.id,
+          p.uid,
+          p.windowIndex,
+          p.durationUs,
+          p.positionInWindowUs,
+          p.adPlaybackState,
+          p.isPlaceholder);
       return period;
     }
 
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/MaskingMediaSource.java b/library/core/src/main/java/com/google/android/exoplayer2/source/MaskingMediaSource.java
index 0f55b39cb6..e7c27ba95e 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/MaskingMediaSource.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/MaskingMediaSource.java
@@ -24,6 +24,7 @@ import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.MediaItem;
 import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.Timeline.Window;
+import com.google.android.exoplayer2.source.ads.AdPlaybackState;
 import com.google.android.exoplayer2.upstream.Allocator;
 import com.google.android.exoplayer2.upstream.TransferListener;
 import com.google.android.exoplayer2.util.Assertions;
@@ -400,8 +401,9 @@ public final class MaskingMediaSource extends CompositeMediaSource<Void> {
           /* uid= */ setIds ? MaskingTimeline.MASKING_EXTERNAL_PERIOD_UID : null,
           /* windowIndex= */ 0,
           /* durationUs = */ C.TIME_UNSET,
-          /* positionInWindowUs= */ 0);
-      period.isPlaceholder = true;
+          /* positionInWindowUs= */ 0,
+          /* adPlaybackState= */ AdPlaybackState.NONE,
+          /* isPlaceholder= */ true);
       return period;
     }
 
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/ads/SinglePeriodAdTimeline.java b/library/core/src/main/java/com/google/android/exoplayer2/source/ads/SinglePeriodAdTimeline.java
index 9c3dd042b4..a114bd92d9 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/ads/SinglePeriodAdTimeline.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/ads/SinglePeriodAdTimeline.java
@@ -52,7 +52,8 @@ public final class SinglePeriodAdTimeline extends ForwardingTimeline {
         period.windowIndex,
         durationUs,
         period.getPositionInWindowUs(),
-        adPlaybackState);
+        adPlaybackState,
+        period.isPlaceholder);
     return period;
   }
 }
diff --git a/testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeTimeline.java b/testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeTimeline.java
index dc192e9f41..6bd498e199 100644
--- a/testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeTimeline.java
+++ b/testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeTimeline.java
@@ -414,8 +414,8 @@ public final class FakeTimeline extends Timeline {
         windowIndex,
         periodDurationUs,
         positionInWindowUs,
-        windowDefinition.adPlaybackState);
-    period.isPlaceholder = windowDefinition.isPlaceholder;
+        windowDefinition.adPlaybackState,
+        windowDefinition.isPlaceholder);
     return period;
   }