diff --git a/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java b/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java
index 145c92e94d..119f586a4d 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java
@@ -115,6 +115,10 @@ public final class DefaultAudioSink implements AudioSink {
      * Returns the media duration corresponding to the specified playout duration, taking speed
      * adjustment due to audio processing into account.
      *
+     * <p>The scaling performed by this method will use the actual playback speed achieved by the
+     * audio processor chain, on average, since it was last flushed. This may differ very slightly
+     * from the target playback speed.
+     *
      * @param playoutDuration The playout duration to scale.
      * @return The corresponding media duration, in the same units as {@code duration}.
      */
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/audio/Sonic.java b/library/core/src/main/java/com/google/android/exoplayer2/audio/Sonic.java
index ae65eacd13..5ddedd7bd7 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/Sonic.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/Sonic.java
@@ -83,6 +83,14 @@ import java.util.Arrays;
     pitchBuffer = new short[maxRequiredFrameCount * channelCount];
   }
 
+  /**
+   * Returns the number of bytes that have been input, but will not be processed until more input
+   * data is provided.
+   */
+  public int getPendingInputBytes() {
+    return inputFrameCount * channelCount * BYTES_PER_SAMPLE;
+  }
+
   /**
    * Queues remaining data from {@code buffer}, and advances its position by the number of bytes
    * consumed.
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/audio/SonicAudioProcessor.java b/library/core/src/main/java/com/google/android/exoplayer2/audio/SonicAudioProcessor.java
index 3d11a4c7e3..7acc006bbe 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/SonicAudioProcessor.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/SonicAudioProcessor.java
@@ -15,10 +15,11 @@
  */
 package com.google.android.exoplayer2.audio;
 
+import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
+
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.Format;
-import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.Util;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
@@ -117,16 +118,21 @@ public final class SonicAudioProcessor implements AudioProcessor {
    * Returns the media duration corresponding to the specified playout duration, taking speed
    * adjustment into account.
    *
+   * <p>The scaling performed by this method will use the actual playback speed achieved by the
+   * audio processor, on average, since it was last flushed. This may differ very slightly from the
+   * target playback speed.
+   *
    * @param playoutDuration The playout duration to scale.
    * @return The corresponding media duration, in the same units as {@code duration}.
    */
   public long getMediaDuration(long playoutDuration) {
     if (outputBytes >= MIN_BYTES_FOR_DURATION_SCALING_CALCULATION) {
+      long processedInputBytes = inputBytes - checkNotNull(sonic).getPendingInputBytes();
       return outputAudioFormat.sampleRate == inputAudioFormat.sampleRate
-          ? Util.scaleLargeTimestamp(playoutDuration, inputBytes, outputBytes)
+          ? Util.scaleLargeTimestamp(playoutDuration, processedInputBytes, outputBytes)
           : Util.scaleLargeTimestamp(
               playoutDuration,
-              inputBytes * outputAudioFormat.sampleRate,
+              processedInputBytes * outputAudioFormat.sampleRate,
               outputBytes * inputAudioFormat.sampleRate);
     } else {
       return (long) ((double) speed * playoutDuration);
@@ -159,7 +165,7 @@ public final class SonicAudioProcessor implements AudioProcessor {
 
   @Override
   public void queueInput(ByteBuffer inputBuffer) {
-    Sonic sonic = Assertions.checkNotNull(this.sonic);
+    Sonic sonic = checkNotNull(this.sonic);
     if (inputBuffer.hasRemaining()) {
       ShortBuffer shortBuffer = inputBuffer.asShortBuffer();
       int inputSize = inputBuffer.remaining();