diff --git a/libraries/muxer/src/androidTest/java/androidx/media3/muxer/Mp4MuxerEndToEndParameterizedAndroidTest.java b/libraries/muxer/src/androidTest/java/androidx/media3/muxer/Mp4MuxerEndToEndParameterizedAndroidTest.java
index cdea32d3ed..ecc171bcec 100644
--- a/libraries/muxer/src/androidTest/java/androidx/media3/muxer/Mp4MuxerEndToEndParameterizedAndroidTest.java
+++ b/libraries/muxer/src/androidTest/java/androidx/media3/muxer/Mp4MuxerEndToEndParameterizedAndroidTest.java
@@ -51,6 +51,7 @@ public class Mp4MuxerEndToEndParameterizedAndroidTest {
   private static final String H265_HDR10_MP4 = "hdr10-720p.mp4";
   private static final String H265_WITH_METADATA_TRACK_MP4 = "h265_with_metadata_track.mp4";
   private static final String AV1_MP4 = "sample_av1.mp4";
+  private static final String AMR_WB = "bbb_mono_16kHz_23.05kbps_amrwb.3gp";
 
   @Parameters(name = "{0}")
   public static ImmutableList<String> mediaSamples() {
@@ -60,7 +61,8 @@ public class Mp4MuxerEndToEndParameterizedAndroidTest {
         H264_WITH_PYRAMID_B_FRAMES_MP4,
         H265_HDR10_MP4,
         H265_WITH_METADATA_TRACK_MP4,
-        AV1_MP4);
+        AV1_MP4,
+        AMR_WB);
   }
 
   @Parameter public @MonotonicNonNull String inputFile;
diff --git a/libraries/muxer/src/main/java/androidx/media3/muxer/Boxes.java b/libraries/muxer/src/main/java/androidx/media3/muxer/Boxes.java
index 6c13832f10..ca4f1087d4 100644
--- a/libraries/muxer/src/main/java/androidx/media3/muxer/Boxes.java
+++ b/libraries/muxer/src/main/java/androidx/media3/muxer/Boxes.java
@@ -21,6 +21,7 @@ import static androidx.media3.common.util.Assertions.checkState;
 import static androidx.media3.muxer.ColorUtils.MEDIAFORMAT_STANDARD_TO_PRIMARIES_AND_MATRIX;
 import static androidx.media3.muxer.ColorUtils.MEDIAFORMAT_TRANSFER_TO_MP4_TRANSFER;
 import static androidx.media3.muxer.Mp4Utils.UNSIGNED_INT_MAX_VALUE;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import android.media.MediaCodec;
 import android.media.MediaCodec.BufferInfo;
@@ -541,6 +542,8 @@ import java.util.List;
     switch (mimeType) {
       case MimeTypes.AUDIO_AAC:
         return esdsBox(format);
+      case MimeTypes.AUDIO_AMR_WB:
+        return damrBox(/* mode= */ (short) 0x83FF); // mode set: all enabled
       case MimeTypes.VIDEO_H264:
         return avcCBox(format);
       case MimeTypes.VIDEO_H265:
@@ -1317,6 +1320,8 @@ import java.util.List;
     switch (mimeType) {
       case MimeTypes.AUDIO_AAC:
         return "mp4a";
+      case MimeTypes.AUDIO_AMR_WB:
+        return "sawb";
       case MimeTypes.VIDEO_H264:
         return "avc1";
       case MimeTypes.VIDEO_H265:
@@ -1380,6 +1385,21 @@ import java.util.List;
     return BoxUtils.wrapIntoBox("esds", contents);
   }
 
+  /** Returns the audio damr box. */
+  private static ByteBuffer damrBox(short mode) {
+
+    ByteBuffer contents = ByteBuffer.allocate(MAX_FIXED_LEAF_BOX_SIZE);
+
+    contents.put("    ".getBytes(UTF_8)); // vendor: 4 bytes
+    contents.put((byte) 0); // decoder version
+    contents.putShort(mode);
+    contents.put((byte) 0); // mode change period
+    contents.put((byte) 1); // frames per sample
+
+    contents.flip();
+    return BoxUtils.wrapIntoBox("damr", contents);
+  }
+
   /** Packs a three-letter language code into a short, packing 3x5 bits. */
   private static short languageCodeFromString(@Nullable String code) {
     if (code == null) {
diff --git a/libraries/muxer/src/test/java/androidx/media3/muxer/BoxesTest.java b/libraries/muxer/src/test/java/androidx/media3/muxer/BoxesTest.java
index 44e74aac17..1b74bc912a 100644
--- a/libraries/muxer/src/test/java/androidx/media3/muxer/BoxesTest.java
+++ b/libraries/muxer/src/test/java/androidx/media3/muxer/BoxesTest.java
@@ -253,6 +253,27 @@ public class BoxesTest {
         context, dumpableBox, getExpectedDumpFilePath("audio_sample_entry_box_mp4a"));
   }
 
+  @Test
+  public void createAudioSampleEntryBox_forSawb_matchesExpected() throws Exception {
+    Format format =
+        new Format.Builder()
+            .setPeakBitrate(128000)
+            .setSampleRate(48000)
+            .setId(3)
+            .setSampleMimeType("audio/amr-wb")
+            .setChannelCount(2)
+            .setAverageBitrate(128000)
+            .setLanguage("```")
+            .setMaxInputSize(502)
+            .build();
+
+    ByteBuffer audioSampleEntryBox = Boxes.audioSampleEntry(format);
+
+    DumpableMp4Box dumpableBox = new DumpableMp4Box(audioSampleEntryBox);
+    DumpFileAsserts.assertOutput(
+        context, dumpableBox, getExpectedDumpFilePath("audio_sample_entry_box_sawb"));
+  }
+
   @Test
   public void createAudioSampleEntryBox_withUnknownAudioFormat_throws() {
     // The audio format contains an unknown MIME type.
diff --git a/libraries/test_data/src/test/assets/media/mp4/bbb_mono_16kHz_23.05kbps_amrwb.3gp b/libraries/test_data/src/test/assets/media/mp4/bbb_mono_16kHz_23.05kbps_amrwb.3gp
new file mode 100644
index 0000000000..6722f13270
Binary files /dev/null and b/libraries/test_data/src/test/assets/media/mp4/bbb_mono_16kHz_23.05kbps_amrwb.3gp differ
diff --git a/libraries/test_data/src/test/assets/muxerdumps/audio_sample_entry_box_sawb.dump b/libraries/test_data/src/test/assets/muxerdumps/audio_sample_entry_box_sawb.dump
new file mode 100644
index 0000000000..c14524ad3d
--- /dev/null
+++ b/libraries/test_data/src/test/assets/muxerdumps/audio_sample_entry_box_sawb.dump
@@ -0,0 +1,2 @@
+sawb (53 bytes):
+  Data = length 45, hash 7F064471
diff --git a/libraries/test_data/src/test/assets/muxerdumps/bbb_mono_16kHz_23.05kbps_amrwb.3gp.dump b/libraries/test_data/src/test/assets/muxerdumps/bbb_mono_16kHz_23.05kbps_amrwb.3gp.dump
new file mode 100644
index 0000000000..5412e4734a
--- /dev/null
+++ b/libraries/test_data/src/test/assets/muxerdumps/bbb_mono_16kHz_23.05kbps_amrwb.3gp.dump
@@ -0,0 +1,620 @@
+seekMap:
+  isSeekable = true
+  duration = 2980000
+  getPosition(0) = [[timeUs=0, position=400052]]
+  getPosition(1) = [[timeUs=1, position=400052]]
+  getPosition(1490000) = [[timeUs=1490000, position=404418]]
+  getPosition(2980000) = [[timeUs=2980000, position=408843]]
+numberOfTracks = 1
+track 0:
+  total output bytes = 8850
+  sample count = 150
+  format 0:
+    id = 1
+    sampleMimeType = audio/amr-wb
+    maxInputSize = 89
+    channelCount = 1
+    sampleRate = 16000
+    language = und
+    metadata = entries=[Mp4Timestamp: creation time=100000000, modification time=500000000, timescale=10000]
+  sample 0:
+    time = 0
+    flags = 1
+    data = length 59, hash 7CD1831D
+  sample 1:
+    time = 20000
+    flags = 1
+    data = length 59, hash D3770C4A
+  sample 2:
+    time = 40000
+    flags = 1
+    data = length 59, hash 9FE1F1DC
+  sample 3:
+    time = 60000
+    flags = 1
+    data = length 59, hash E01D2E94
+  sample 4:
+    time = 80000
+    flags = 1
+    data = length 59, hash 9F0F1148
+  sample 5:
+    time = 100000
+    flags = 1
+    data = length 59, hash 84844FC5
+  sample 6:
+    time = 120000
+    flags = 1
+    data = length 59, hash E1BA9151
+  sample 7:
+    time = 140000
+    flags = 1
+    data = length 59, hash 809C53C7
+  sample 8:
+    time = 160000
+    flags = 1
+    data = length 59, hash CF7C326C
+  sample 9:
+    time = 180000
+    flags = 1
+    data = length 59, hash 9493FCC5
+  sample 10:
+    time = 200000
+    flags = 1
+    data = length 59, hash 7E1C0B55
+  sample 11:
+    time = 220000
+    flags = 1
+    data = length 59, hash 590CE70F
+  sample 12:
+    time = 240000
+    flags = 1
+    data = length 59, hash AE96EA
+  sample 13:
+    time = 260000
+    flags = 1
+    data = length 59, hash 101B6F1F
+  sample 14:
+    time = 280000
+    flags = 1
+    data = length 59, hash A7B53E8
+  sample 15:
+    time = 300000
+    flags = 1
+    data = length 59, hash ADFF0186
+  sample 16:
+    time = 320000
+    flags = 1
+    data = length 59, hash 62429AE2
+  sample 17:
+    time = 340000
+    flags = 1
+    data = length 59, hash C0DE98C4
+  sample 18:
+    time = 360000
+    flags = 1
+    data = length 59, hash 38248344
+  sample 19:
+    time = 380000
+    flags = 1
+    data = length 59, hash 6FA9C78D
+  sample 20:
+    time = 400000
+    flags = 1
+    data = length 59, hash 70E62506
+  sample 21:
+    time = 420000
+    flags = 1
+    data = length 59, hash C5852B4D
+  sample 22:
+    time = 440000
+    flags = 1
+    data = length 59, hash 3963835
+  sample 23:
+    time = 460000
+    flags = 1
+    data = length 59, hash 12332285
+  sample 24:
+    time = 480000
+    flags = 1
+    data = length 59, hash 6992A084
+  sample 25:
+    time = 500000
+    flags = 1
+    data = length 59, hash 5F571FDF
+  sample 26:
+    time = 520000
+    flags = 1
+    data = length 59, hash 3897B324
+  sample 27:
+    time = 540000
+    flags = 1
+    data = length 59, hash E55F2655
+  sample 28:
+    time = 560000
+    flags = 1
+    data = length 59, hash 2EEF8B7B
+  sample 29:
+    time = 580000
+    flags = 1
+    data = length 59, hash 5C36A7D6
+  sample 30:
+    time = 600000
+    flags = 1
+    data = length 59, hash EA18CD8F
+  sample 31:
+    time = 620000
+    flags = 1
+    data = length 59, hash 2C2702ED
+  sample 32:
+    time = 640000
+    flags = 1
+    data = length 59, hash 31438CAF
+  sample 33:
+    time = 660000
+    flags = 1
+    data = length 59, hash 5F8FD154
+  sample 34:
+    time = 680000
+    flags = 1
+    data = length 59, hash 9D352097
+  sample 35:
+    time = 700000
+    flags = 1
+    data = length 59, hash D7EA644
+  sample 36:
+    time = 720000
+    flags = 1
+    data = length 59, hash 8905564B
+  sample 37:
+    time = 740000
+    flags = 1
+    data = length 59, hash 8FCB240C
+  sample 38:
+    time = 760000
+    flags = 1
+    data = length 59, hash B74A9E26
+  sample 39:
+    time = 780000
+    flags = 1
+    data = length 59, hash EA79D25B
+  sample 40:
+    time = 800000
+    flags = 1
+    data = length 59, hash 798EC537
+  sample 41:
+    time = 820000
+    flags = 1
+    data = length 59, hash F4D614DE
+  sample 42:
+    time = 840000
+    flags = 1
+    data = length 59, hash 9F3F5B91
+  sample 43:
+    time = 860000
+    flags = 1
+    data = length 59, hash B04F058
+  sample 44:
+    time = 880000
+    flags = 1
+    data = length 59, hash 8758EDC0
+  sample 45:
+    time = 900000
+    flags = 1
+    data = length 59, hash DFBCAE27
+  sample 46:
+    time = 920000
+    flags = 1
+    data = length 59, hash BF6AF6FD
+  sample 47:
+    time = 940000
+    flags = 1
+    data = length 59, hash 319B3149
+  sample 48:
+    time = 960000
+    flags = 1
+    data = length 59, hash 8CA30C36
+  sample 49:
+    time = 980000
+    flags = 1
+    data = length 59, hash 74CD82DA
+  sample 50:
+    time = 1000000
+    flags = 1
+    data = length 59, hash 8123D422
+  sample 51:
+    time = 1020000
+    flags = 1
+    data = length 59, hash 697DFCCA
+  sample 52:
+    time = 1040000
+    flags = 1
+    data = length 59, hash 40EC178E
+  sample 53:
+    time = 1060000
+    flags = 1
+    data = length 59, hash C8418BE1
+  sample 54:
+    time = 1080000
+    flags = 1
+    data = length 59, hash 7AC2CF25
+  sample 55:
+    time = 1100000
+    flags = 1
+    data = length 59, hash BCCEFF19
+  sample 56:
+    time = 1120000
+    flags = 1
+    data = length 59, hash 975A96
+  sample 57:
+    time = 1140000
+    flags = 1
+    data = length 59, hash 8F187C30
+  sample 58:
+    time = 1160000
+    flags = 1
+    data = length 59, hash D7797178
+  sample 59:
+    time = 1180000
+    flags = 1
+    data = length 59, hash CE6E8CA6
+  sample 60:
+    time = 1200000
+    flags = 1
+    data = length 59, hash 5A50B1A8
+  sample 61:
+    time = 1220000
+    flags = 1
+    data = length 59, hash ADDECF9A
+  sample 62:
+    time = 1240000
+    flags = 1
+    data = length 59, hash C5F376FF
+  sample 63:
+    time = 1260000
+    flags = 1
+    data = length 59, hash 1A83DF9A
+  sample 64:
+    time = 1280000
+    flags = 1
+    data = length 59, hash AC44CC85
+  sample 65:
+    time = 1300000
+    flags = 1
+    data = length 59, hash FE8D7E6D
+  sample 66:
+    time = 1320000
+    flags = 1
+    data = length 59, hash 50269ED4
+  sample 67:
+    time = 1340000
+    flags = 1
+    data = length 59, hash 1CC6FC25
+  sample 68:
+    time = 1360000
+    flags = 1
+    data = length 59, hash 6A4092A7
+  sample 69:
+    time = 1380000
+    flags = 1
+    data = length 59, hash 68C46314
+  sample 70:
+    time = 1400000
+    flags = 1
+    data = length 59, hash 5964275A
+  sample 71:
+    time = 1420000
+    flags = 1
+    data = length 59, hash 3130A785
+  sample 72:
+    time = 1440000
+    flags = 1
+    data = length 59, hash 83F2D996
+  sample 73:
+    time = 1460000
+    flags = 1
+    data = length 59, hash 515A062A
+  sample 74:
+    time = 1480000
+    flags = 1
+    data = length 59, hash 1D64DD8B
+  sample 75:
+    time = 1500000
+    flags = 1
+    data = length 59, hash 63587E3
+  sample 76:
+    time = 1520000
+    flags = 1
+    data = length 59, hash 68DCB927
+  sample 77:
+    time = 1540000
+    flags = 1
+    data = length 59, hash CDBA3C67
+  sample 78:
+    time = 1560000
+    flags = 1
+    data = length 59, hash 12A67F90
+  sample 79:
+    time = 1580000
+    flags = 1
+    data = length 59, hash 61159E34
+  sample 80:
+    time = 1600000
+    flags = 1
+    data = length 59, hash 45A73FB9
+  sample 81:
+    time = 1620000
+    flags = 1
+    data = length 59, hash 5A841075
+  sample 82:
+    time = 1640000
+    flags = 1
+    data = length 59, hash EBCDC2CA
+  sample 83:
+    time = 1660000
+    flags = 1
+    data = length 59, hash F751E192
+  sample 84:
+    time = 1680000
+    flags = 1
+    data = length 59, hash 5F8907C6
+  sample 85:
+    time = 1700000
+    flags = 1
+    data = length 59, hash FC73C275
+  sample 86:
+    time = 1720000
+    flags = 1
+    data = length 59, hash 2D4154EB
+  sample 87:
+    time = 1740000
+    flags = 1
+    data = length 59, hash ECA668E1
+  sample 88:
+    time = 1760000
+    flags = 1
+    data = length 59, hash 8C27620A
+  sample 89:
+    time = 1780000
+    flags = 1
+    data = length 59, hash 8D8BC449
+  sample 90:
+    time = 1800000
+    flags = 1
+    data = length 59, hash 332FDB24
+  sample 91:
+    time = 1820000
+    flags = 1
+    data = length 59, hash 33C2F5AF
+  sample 92:
+    time = 1840000
+    flags = 1
+    data = length 59, hash E08089D5
+  sample 93:
+    time = 1860000
+    flags = 1
+    data = length 59, hash A0A51B67
+  sample 94:
+    time = 1880000
+    flags = 1
+    data = length 59, hash 14B84283
+  sample 95:
+    time = 1900000
+    flags = 1
+    data = length 59, hash BB7F61C6
+  sample 96:
+    time = 1920000
+    flags = 1
+    data = length 59, hash C870B629
+  sample 97:
+    time = 1940000
+    flags = 1
+    data = length 59, hash DA557DDA
+  sample 98:
+    time = 1960000
+    flags = 1
+    data = length 59, hash 4E7D8042
+  sample 99:
+    time = 1980000
+    flags = 1
+    data = length 59, hash 91060D4A
+  sample 100:
+    time = 2000000
+    flags = 1
+    data = length 59, hash 676F457A
+  sample 101:
+    time = 2020000
+    flags = 1
+    data = length 59, hash 8BE7A3E2
+  sample 102:
+    time = 2040000
+    flags = 1
+    data = length 59, hash 8B5F28E4
+  sample 103:
+    time = 2060000
+    flags = 1
+    data = length 59, hash 88288529
+  sample 104:
+    time = 2080000
+    flags = 1
+    data = length 59, hash 52EF420D
+  sample 105:
+    time = 2100000
+    flags = 1
+    data = length 59, hash DA4DA53B
+  sample 106:
+    time = 2120000
+    flags = 1
+    data = length 59, hash CC3284E
+  sample 107:
+    time = 2140000
+    flags = 1
+    data = length 59, hash 371BB544
+  sample 108:
+    time = 2160000
+    flags = 1
+    data = length 59, hash E40EE9CA
+  sample 109:
+    time = 2180000
+    flags = 1
+    data = length 59, hash C070679F
+  sample 110:
+    time = 2200000
+    flags = 1
+    data = length 59, hash F62B5F23
+  sample 111:
+    time = 2220000
+    flags = 1
+    data = length 59, hash 1C265EC6
+  sample 112:
+    time = 2240000
+    flags = 1
+    data = length 59, hash AF49562
+  sample 113:
+    time = 2260000
+    flags = 1
+    data = length 59, hash F3E1441B
+  sample 114:
+    time = 2280000
+    flags = 1
+    data = length 59, hash 808BA758
+  sample 115:
+    time = 2300000
+    flags = 1
+    data = length 59, hash 17931F4C
+  sample 116:
+    time = 2320000
+    flags = 1
+    data = length 59, hash 59EBFB2C
+  sample 117:
+    time = 2340000
+    flags = 1
+    data = length 59, hash 48CBD767
+  sample 118:
+    time = 2360000
+    flags = 1
+    data = length 59, hash 37F0E68C
+  sample 119:
+    time = 2380000
+    flags = 1
+    data = length 59, hash 78D9C594
+  sample 120:
+    time = 2400000
+    flags = 1
+    data = length 59, hash BC29DE1A
+  sample 121:
+    time = 2420000
+    flags = 1
+    data = length 59, hash 30D57FD8
+  sample 122:
+    time = 2440000
+    flags = 1
+    data = length 59, hash 11EBFCA7
+  sample 123:
+    time = 2460000
+    flags = 1
+    data = length 59, hash 4A073D0
+  sample 124:
+    time = 2480000
+    flags = 1
+    data = length 59, hash AAE23356
+  sample 125:
+    time = 2500000
+    flags = 1
+    data = length 59, hash 8CD60F62
+  sample 126:
+    time = 2520000
+    flags = 1
+    data = length 59, hash 413DF0E5
+  sample 127:
+    time = 2540000
+    flags = 1
+    data = length 59, hash E0A6E95
+  sample 128:
+    time = 2560000
+    flags = 1
+    data = length 59, hash 3E41A79F
+  sample 129:
+    time = 2580000
+    flags = 1
+    data = length 59, hash 74E52392
+  sample 130:
+    time = 2600000
+    flags = 1
+    data = length 59, hash 4730E2F8
+  sample 131:
+    time = 2620000
+    flags = 1
+    data = length 59, hash F76800F3
+  sample 132:
+    time = 2640000
+    flags = 1
+    data = length 59, hash 6EAFD6A7
+  sample 133:
+    time = 2660000
+    flags = 1
+    data = length 59, hash F22E2D70
+  sample 134:
+    time = 2680000
+    flags = 1
+    data = length 59, hash 70229933
+  sample 135:
+    time = 2700000
+    flags = 1
+    data = length 59, hash 6FF33D1C
+  sample 136:
+    time = 2720000
+    flags = 1
+    data = length 59, hash 83EC00FE
+  sample 137:
+    time = 2740000
+    flags = 1
+    data = length 59, hash 292A2AFD
+  sample 138:
+    time = 2760000
+    flags = 1
+    data = length 59, hash A4ECB34E
+  sample 139:
+    time = 2780000
+    flags = 1
+    data = length 59, hash 7B1A9983
+  sample 140:
+    time = 2800000
+    flags = 1
+    data = length 59, hash 486E9059
+  sample 141:
+    time = 2820000
+    flags = 1
+    data = length 59, hash 2255918
+  sample 142:
+    time = 2840000
+    flags = 1
+    data = length 59, hash 33DC9432
+  sample 143:
+    time = 2860000
+    flags = 1
+    data = length 59, hash 41D0A458
+  sample 144:
+    time = 2880000
+    flags = 1
+    data = length 59, hash DBA9CED6
+  sample 145:
+    time = 2900000
+    flags = 1
+    data = length 59, hash FA055524
+  sample 146:
+    time = 2920000
+    flags = 1
+    data = length 59, hash A4146B9E
+  sample 147:
+    time = 2940000
+    flags = 1
+    data = length 59, hash 2DC246A0
+  sample 148:
+    time = 2960000
+    flags = 1
+    data = length 59, hash 4A8B5F2A
+  sample 149:
+    time = 2980000
+    flags = 536870913
+    data = length 59, hash D3223AAC
+tracksEnded = true