diff --git a/extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java b/extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java
index a08d466492..2f48ffe98a 100644
--- a/extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java
+++ b/extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java
@@ -97,6 +97,7 @@ public final class CastPlayer extends BasePlayer {
               COMMAND_GET_CURRENT_MEDIA_ITEM,
               COMMAND_GET_MEDIA_ITEMS,
               COMMAND_GET_MEDIA_ITEMS_METADATA,
+              COMMAND_SET_MEDIA_ITEMS_METADATA,
               COMMAND_CHANGE_MEDIA_ITEMS)
           .build();
 
diff --git a/extensions/cast/src/test/java/com/google/android/exoplayer2/ext/cast/CastPlayerTest.java b/extensions/cast/src/test/java/com/google/android/exoplayer2/ext/cast/CastPlayerTest.java
index 0a687f50b4..0e1fda177b 100644
--- a/extensions/cast/src/test/java/com/google/android/exoplayer2/ext/cast/CastPlayerTest.java
+++ b/extensions/cast/src/test/java/com/google/android/exoplayer2/ext/cast/CastPlayerTest.java
@@ -32,6 +32,7 @@ import static com.google.android.exoplayer2.Player.COMMAND_SEEK_TO_MEDIA_ITEM;
 import static com.google.android.exoplayer2.Player.COMMAND_SEEK_TO_NEXT_MEDIA_ITEM;
 import static com.google.android.exoplayer2.Player.COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM;
 import static com.google.android.exoplayer2.Player.COMMAND_SET_DEVICE_VOLUME;
+import static com.google.android.exoplayer2.Player.COMMAND_SET_MEDIA_ITEMS_METADATA;
 import static com.google.android.exoplayer2.Player.COMMAND_SET_REPEAT_MODE;
 import static com.google.android.exoplayer2.Player.COMMAND_SET_SHUFFLE_MODE;
 import static com.google.android.exoplayer2.Player.COMMAND_SET_SPEED_AND_PITCH;
@@ -1120,6 +1121,7 @@ public class CastPlayerTest {
     assertThat(castPlayer.isCommandAvailable(COMMAND_GET_CURRENT_MEDIA_ITEM)).isTrue();
     assertThat(castPlayer.isCommandAvailable(COMMAND_GET_MEDIA_ITEMS)).isTrue();
     assertThat(castPlayer.isCommandAvailable(COMMAND_GET_MEDIA_ITEMS_METADATA)).isTrue();
+    assertThat(castPlayer.isCommandAvailable(COMMAND_SET_MEDIA_ITEMS_METADATA)).isTrue();
     assertThat(castPlayer.isCommandAvailable(COMMAND_CHANGE_MEDIA_ITEMS)).isTrue();
     assertThat(castPlayer.isCommandAvailable(COMMAND_GET_AUDIO_ATTRIBUTES)).isFalse();
     assertThat(castPlayer.isCommandAvailable(COMMAND_GET_VOLUME)).isFalse();
diff --git a/library/common/src/main/java/com/google/android/exoplayer2/Player.java b/library/common/src/main/java/com/google/android/exoplayer2/Player.java
index 24796a871c..89b5dbff1c 100644
--- a/library/common/src/main/java/com/google/android/exoplayer2/Player.java
+++ b/library/common/src/main/java/com/google/android/exoplayer2/Player.java
@@ -954,10 +954,11 @@ public interface Player {
    * #COMMAND_SET_SPEED_AND_PITCH}, {@link #COMMAND_SET_SHUFFLE_MODE}, {@link
    * #COMMAND_SET_REPEAT_MODE}, {@link #COMMAND_GET_CURRENT_MEDIA_ITEM}, {@link
    * #COMMAND_GET_MEDIA_ITEMS}, {@link #COMMAND_GET_MEDIA_ITEMS_METADATA}, {@link
-   * #COMMAND_CHANGE_MEDIA_ITEMS}, {@link #COMMAND_GET_AUDIO_ATTRIBUTES}, {@link
-   * #COMMAND_GET_VOLUME}, {@link #COMMAND_GET_DEVICE_VOLUME}, {@link #COMMAND_SET_VOLUME}, {@link
-   * #COMMAND_SET_DEVICE_VOLUME}, {@link #COMMAND_ADJUST_DEVICE_VOLUME}, {@link
-   * #COMMAND_SET_VIDEO_SURFACE} or {@link #COMMAND_GET_TEXT}.
+   * #COMMAND_SET_MEDIA_ITEMS_METADATA}, {@link #COMMAND_CHANGE_MEDIA_ITEMS}, {@link
+   * #COMMAND_GET_AUDIO_ATTRIBUTES}, {@link #COMMAND_GET_VOLUME}, {@link
+   * #COMMAND_GET_DEVICE_VOLUME}, {@link #COMMAND_SET_VOLUME}, {@link #COMMAND_SET_DEVICE_VOLUME},
+   * {@link #COMMAND_ADJUST_DEVICE_VOLUME}, {@link #COMMAND_SET_VIDEO_SURFACE} or {@link
+   * #COMMAND_GET_TEXT}.
    */
   @Documented
   @Retention(RetentionPolicy.SOURCE)
@@ -975,6 +976,7 @@ public interface Player {
     COMMAND_GET_CURRENT_MEDIA_ITEM,
     COMMAND_GET_MEDIA_ITEMS,
     COMMAND_GET_MEDIA_ITEMS_METADATA,
+    COMMAND_SET_MEDIA_ITEMS_METADATA,
     COMMAND_CHANGE_MEDIA_ITEMS,
     COMMAND_GET_AUDIO_ATTRIBUTES,
     COMMAND_GET_VOLUME,
@@ -1012,24 +1014,26 @@ public interface Player {
   int COMMAND_GET_MEDIA_ITEMS = 12;
   /** Command to get the {@link MediaItem MediaItems} metadata. */
   int COMMAND_GET_MEDIA_ITEMS_METADATA = 13;
+  /** Command to set the {@link MediaItem MediaItems} metadata. */
+  int COMMAND_SET_MEDIA_ITEMS_METADATA = 14;
   /** Command to change the {@link MediaItem MediaItems} in the playlist. */
-  int COMMAND_CHANGE_MEDIA_ITEMS = 14;
+  int COMMAND_CHANGE_MEDIA_ITEMS = 15;
   /** Command to get the player current {@link AudioAttributes}. */
-  int COMMAND_GET_AUDIO_ATTRIBUTES = 15;
+  int COMMAND_GET_AUDIO_ATTRIBUTES = 16;
   /** Command to get the player volume. */
-  int COMMAND_GET_VOLUME = 16;
+  int COMMAND_GET_VOLUME = 17;
   /** Command to get the device volume and whether it is muted. */
-  int COMMAND_GET_DEVICE_VOLUME = 17;
+  int COMMAND_GET_DEVICE_VOLUME = 18;
   /** Command to set the player volume. */
-  int COMMAND_SET_VOLUME = 18;
+  int COMMAND_SET_VOLUME = 19;
   /** Command to set the device volume and mute it. */
-  int COMMAND_SET_DEVICE_VOLUME = 19;
+  int COMMAND_SET_DEVICE_VOLUME = 20;
   /** Command to increase and decrease the device volume and mute it. */
-  int COMMAND_ADJUST_DEVICE_VOLUME = 20;
+  int COMMAND_ADJUST_DEVICE_VOLUME = 21;
   /** Command to set and clear the surface on which to render the video. */
-  int COMMAND_SET_VIDEO_SURFACE = 21;
+  int COMMAND_SET_VIDEO_SURFACE = 22;
   /** Command to get the text that should currently be displayed by the player. */
-  int COMMAND_GET_TEXT = 22;
+  int COMMAND_GET_TEXT = 23;
 
   /**
    * Returns the {@link Looper} associated with the application thread that's used to access the
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java b/library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java
index 8ba1ff5fba..734578dada 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java
@@ -201,6 +201,7 @@ import java.util.concurrent.CopyOnWriteArraySet;
                 COMMAND_GET_CURRENT_MEDIA_ITEM,
                 COMMAND_GET_MEDIA_ITEMS,
                 COMMAND_GET_MEDIA_ITEMS_METADATA,
+                COMMAND_SET_MEDIA_ITEMS_METADATA,
                 COMMAND_CHANGE_MEDIA_ITEMS)
             .addAll(additionalPermanentAvailableCommands)
             .build();
diff --git a/library/core/src/test/java/com/google/android/exoplayer2/ExoPlayerTest.java b/library/core/src/test/java/com/google/android/exoplayer2/ExoPlayerTest.java
index 5356a2b3d7..70c8d12a22 100644
--- a/library/core/src/test/java/com/google/android/exoplayer2/ExoPlayerTest.java
+++ b/library/core/src/test/java/com/google/android/exoplayer2/ExoPlayerTest.java
@@ -32,6 +32,7 @@ import static com.google.android.exoplayer2.Player.COMMAND_SEEK_TO_MEDIA_ITEM;
 import static com.google.android.exoplayer2.Player.COMMAND_SEEK_TO_NEXT_MEDIA_ITEM;
 import static com.google.android.exoplayer2.Player.COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM;
 import static com.google.android.exoplayer2.Player.COMMAND_SET_DEVICE_VOLUME;
+import static com.google.android.exoplayer2.Player.COMMAND_SET_MEDIA_ITEMS_METADATA;
 import static com.google.android.exoplayer2.Player.COMMAND_SET_REPEAT_MODE;
 import static com.google.android.exoplayer2.Player.COMMAND_SET_SHUFFLE_MODE;
 import static com.google.android.exoplayer2.Player.COMMAND_SET_SPEED_AND_PITCH;
@@ -8084,6 +8085,7 @@ public final class ExoPlayerTest {
     assertThat(player.isCommandAvailable(COMMAND_GET_CURRENT_MEDIA_ITEM)).isTrue();
     assertThat(player.isCommandAvailable(COMMAND_GET_MEDIA_ITEMS)).isTrue();
     assertThat(player.isCommandAvailable(COMMAND_GET_MEDIA_ITEMS_METADATA)).isTrue();
+    assertThat(player.isCommandAvailable(COMMAND_SET_MEDIA_ITEMS_METADATA)).isTrue();
     assertThat(player.isCommandAvailable(COMMAND_CHANGE_MEDIA_ITEMS)).isTrue();
     assertThat(player.isCommandAvailable(COMMAND_GET_AUDIO_ATTRIBUTES)).isTrue();
     assertThat(player.isCommandAvailable(COMMAND_GET_VOLUME)).isTrue();
@@ -10274,6 +10276,7 @@ public final class ExoPlayerTest {
         COMMAND_GET_CURRENT_MEDIA_ITEM,
         COMMAND_GET_MEDIA_ITEMS,
         COMMAND_GET_MEDIA_ITEMS_METADATA,
+        COMMAND_SET_MEDIA_ITEMS_METADATA,
         COMMAND_CHANGE_MEDIA_ITEMS,
         COMMAND_GET_AUDIO_ATTRIBUTES,
         COMMAND_GET_VOLUME,