diff --git a/api/current.txt b/api/current.txt
index 723ffec5916b9..37173e49cdb78 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -26238,6 +26238,7 @@ package android.media {
     field public static final String KEY_ROTATION = "rotation-degrees";
     field public static final String KEY_SAMPLE_RATE = "sample-rate";
     field public static final String KEY_SLICE_HEIGHT = "slice-height";
+    field public static final String KEY_SLOW_MOTION_MARKERS = "slow-motion-markers";
     field public static final String KEY_STRIDE = "stride";
     field public static final String KEY_TEMPORAL_LAYERING = "ts-schema";
     field public static final String KEY_TILE_HEIGHT = "tile-height";
diff --git a/media/java/android/media/MediaFormat.java b/media/java/android/media/MediaFormat.java
index 755bbfb943628..1a49b85403e44 100644
--- a/media/java/android/media/MediaFormat.java
+++ b/media/java/android/media/MediaFormat.java
@@ -20,10 +20,12 @@ import android.annotation.IntDef;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.compat.annotation.UnsupportedAppUsage;
+import android.util.Log;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
 import java.util.AbstractSet;
 import java.util.HashMap;
 import java.util.Iterator;
@@ -435,6 +437,52 @@ public final class MediaFormat {
      */
     public static final String KEY_CAPTURE_RATE = "capture-rate";
 
+    /**
+     * A key for retrieving the slow-motion marker information associated with a video track.
+     * <p>
+     * The associated value is a ByteBuffer in {@link ByteOrder#BIG_ENDIAN}
+     * (networking order) of the following format:
+     * </p>
+     * <pre class="prettyprint">
+     *     float(32) playbackRate;
+     *     unsigned int(32) numMarkers;
+     *     for (i = 0;i < numMarkers; i++) {
+     *         int(64) timestampUs;
+     *         float(32) speedRatio;
+     *     }</pre>
+     * The meaning of each field is as follows:
+     * <table border="1" width="90%" align="center" cellpadding="5">
+     *     <tbody>
+     *     <tr>
+     *         <td>playbackRate</td>
+     *         <td>The frame rate at which the playback should happen (or the flattened
+     *             clip should be).</td>
+     *     </tr>
+     *     <tr>
+     *         <td>numMarkers</td>
+     *         <td>The number of slow-motion markers that follows.</td>
+     *     </tr>
+     *     <tr>
+     *         <td>timestampUs</td>
+     *         <td>The starting point of a new segment.</td>
+     *     </tr>
+     *     <tr>
+     *         <td>speedRatio</td>
+     *         <td>The playback speed for that segment. The playback speed is a floating
+     *             point number, indicating how fast the time progresses relative to that
+     *             written in the container. (Eg. 4.0 means time goes 4x as fast, which
+     *             makes 30fps become 120fps.)</td>
+     *     </tr>
+     * </table>
+     * <p>
+     * The following constraints apply to the timestampUs of the markers:
+     * </p>
+     * <li>The timestampUs shall be monotonically increasing.</li>
+     * <li>The timestampUs shall fall within the time span of the video track.</li>
+     * <li>The first timestampUs should match that of the first video sample.</li>
+     */
+    public static final String KEY_SLOW_MOTION_MARKERS = "slow-motion-markers";
+
     /**
      * A key describing the frequency of key frames expressed in seconds between key frames.
      * <p>
diff --git a/non-updatable-api/current.txt b/non-updatable-api/current.txt
index 26a0ad917c99a..b13aa096b5df4 100644
--- a/non-updatable-api/current.txt
+++ b/non-updatable-api/current.txt
@@ -26196,6 +26196,7 @@ package android.media {
     field public static final String KEY_ROTATION = "rotation-degrees";
     field public static final String KEY_SAMPLE_RATE = "sample-rate";
     field public static final String KEY_SLICE_HEIGHT = "slice-height";
+    field public static final String KEY_SLOW_MOTION_MARKERS = "slow-motion-markers";
     field public static final String KEY_STRIDE = "stride";
     field public static final String KEY_TEMPORAL_LAYERING = "ts-schema";
     field public static final String KEY_TILE_HEIGHT = "tile-height";