diff --git a/libraries/container/src/main/java/androidx/media3/container/Mp4Box.java b/libraries/container/src/main/java/androidx/media3/container/Mp4Box.java
index fed3f4902c..c7cf349fb4 100644
--- a/libraries/container/src/main/java/androidx/media3/container/Mp4Box.java
+++ b/libraries/container/src/main/java/androidx/media3/container/Mp4Box.java
@@ -470,6 +470,9 @@ public abstract class Mp4Box {
   @SuppressWarnings("ConstantCaseForConstants")
   public static final int TYPE_apco = 0x6170636f;
 
+  @SuppressWarnings("ConstantCaseForConstants")
+  public static final int TYPE_av3a = 0x61763361;
+
 
   public final int type;
 
diff --git a/libraries/extractor/src/main/java/androidx/media3/extractor/mp4/BoxParser.java b/libraries/extractor/src/main/java/androidx/media3/extractor/mp4/BoxParser.java
index 10e075af7c..40cc4aa56a 100644
--- a/libraries/extractor/src/main/java/androidx/media3/extractor/mp4/BoxParser.java
+++ b/libraries/extractor/src/main/java/androidx/media3/extractor/mp4/BoxParser.java
@@ -1043,7 +1043,8 @@ private static StsdData parseStsd(
           || childAtomType == Mp4Box.TYPE_ulaw
           || childAtomType == Mp4Box.TYPE_Opus
           || childAtomType == Mp4Box.TYPE_fLaC
-          || childAtomType == Mp4Box.TYPE_iamf) {
+          || childAtomType == Mp4Box.TYPE_iamf
+          || childAtomType == Mp4Box.TYPE_av3a) {
         parseAudioSampleEntry(
             stsd,
             childAtomType,
@@ -1840,6 +1841,8 @@ private static void parseAudioSampleEntry(
       mimeType = MimeTypes.AUDIO_TRUEHD;
     } else if (atomType == Mp4Box.TYPE_iamf) {
       mimeType = MimeTypes.AUDIO_IAMF;
+    } else if (atomType == Mp4Box.TYPE_av3a) {
+      mimeType = MimeTypes.AUDIO_AV3A;
     }
 
     @Nullable List<byte[]> initializationData = null;