diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/ProgressiveMediaPeriod.java b/library/core/src/main/java/com/google/android/exoplayer2/source/ProgressiveMediaPeriod.java
index 121eeb940d..a5c8ff631d 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/ProgressiveMediaPeriod.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/ProgressiveMediaPeriod.java
@@ -435,6 +435,10 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
     pendingResetPositionUs = positionUs;
     loadingFinished = false;
     if (loader.isLoading()) {
+      // Discard as much as we can synchronously.
+      for (SampleQueue sampleQueue : sampleQueues) {
+        sampleQueue.discardToEnd();
+      }
       loader.cancelLoading();
     } else {
       loader.clearFatalError();
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/chunk/ChunkSampleStream.java b/library/core/src/main/java/com/google/android/exoplayer2/source/chunk/ChunkSampleStream.java
index 1a451cb0c3..1a5371c83f 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/chunk/ChunkSampleStream.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/chunk/ChunkSampleStream.java
@@ -315,6 +315,11 @@ public class ChunkSampleStream<T extends ChunkSource> implements SampleStream, S
       mediaChunks.clear();
       nextNotifyPrimaryFormatMediaChunkIndex = 0;
       if (loader.isLoading()) {
+        // Discard as much as we can synchronously.
+        primarySampleQueue.discardToEnd();
+        for (SampleQueue embeddedSampleQueue : embeddedSampleQueues) {
+          embeddedSampleQueue.discardToEnd();
+        }
         loader.cancelLoading();
       } else {
         loader.clearFatalError();
diff --git a/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsSampleStreamWrapper.java b/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsSampleStreamWrapper.java
index 7f1af4496f..fb1a6c53d9 100644
--- a/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsSampleStreamWrapper.java
+++ b/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsSampleStreamWrapper.java
@@ -490,6 +490,12 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
     loadingFinished = false;
     mediaChunks.clear();
     if (loader.isLoading()) {
+      if (sampleQueuesBuilt) {
+        // Discard as much as we can synchronously.
+        for (SampleQueue sampleQueue : sampleQueues) {
+          sampleQueue.discardToEnd();
+        }
+      }
       loader.cancelLoading();
     } else {
       loader.clearFatalError();