diff --git a/externs/shaka/player.js b/externs/shaka/player.js
index 6345523850..a2f9eff1fb 100644
--- a/externs/shaka/player.js
+++ b/externs/shaka/player.js
@@ -208,6 +208,8 @@ shaka.extern.BufferedInfo;
  *   pixelAspectRatio: ?string,
  *   hdr: ?string,
  *   mimeType: ?string,
+ *   audioMimeType: ?string,
+ *   videoMimeType: ?string,
  *   codecs: ?string,
  *   audioCodec: ?string,
  *   videoCodec: ?string,
@@ -267,6 +269,10 @@ shaka.extern.BufferedInfo;
  *   The video HDR provided in the manifest, if present.
  * @property {?string} mimeType
  *   The MIME type of the content provided in the manifest.
+ * @property {?string} audioMimeType
+ *   The audio MIME type of the content provided in the manifest.
+ * @property {?string} videoMimeType
+ *   The video MIME type of the content provided in the manifest.
  * @property {?string} codecs
  *   The audio/video codecs string provided in the manifest, if present.
  * @property {?string} audioCodec
diff --git a/lib/util/stream_utils.js b/lib/util/stream_utils.js
index f5a753f923..92866c18bf 100644
--- a/lib/util/stream_utils.js
+++ b/lib/util/stream_utils.js
@@ -846,6 +846,11 @@ shaka.util.StreamUtils = class {
     /** @type {?shaka.extern.Stream} */
     const video = variant.video;
 
+    /** @type {?string} */
+    const audioMimeType = audio ? audio.mimeType : null;
+    /** @type {?string} */
+    const videoMimeType = video ? video.mimeType : null;
+
     /** @type {?string} */
     const audioCodec = audio ? audio.codecs : null;
     /** @type {?string} */
@@ -910,6 +915,8 @@ shaka.util.StreamUtils = class {
       pixelAspectRatio: null,
       hdr: null,
       mimeType: mimeType,
+      audioMimeType: audioMimeType,
+      videoMimeType: videoMimeType,
       codecs: codecs.join(', '),
       audioCodec: audioCodec,
       videoCodec: videoCodec,
@@ -977,6 +984,8 @@ shaka.util.StreamUtils = class {
       pixelAspectRatio: null,
       hdr: null,
       mimeType: stream.mimeType,
+      audioMimeType: null,
+      videoMimeType: null,
       codecs: stream.codecs || null,
       audioCodec: null,
       videoCodec: null,
@@ -1049,6 +1058,8 @@ shaka.util.StreamUtils = class {
       pixelAspectRatio: null,
       hdr: null,
       mimeType: stream.mimeType,
+      audioMimeType: null,
+      videoMimeType: null,
       codecs: null,
       audioCodec: null,
       videoCodec: null,
@@ -1167,6 +1178,8 @@ shaka.util.StreamUtils = class {
       pixelAspectRatio: null,
       hdr: null,
       mimeType: null,
+      audioMimeType: null,
+      videoMimeType: null,
       codecs: null,
       audioCodec: null,
       videoCodec: null,
diff --git a/test/offline/storage_integration.js b/test/offline/storage_integration.js
index e926aa76f1..1c94e6a9e4 100644
--- a/test/offline/storage_integration.js
+++ b/test/offline/storage_integration.js
@@ -1381,6 +1381,8 @@ filterDescribe('Storage', storageSupport, () => {
       pixelAspectRatio: '59:54',
       hdr: null,
       mimeType: 'video/mp4,audio/mp4',
+      audioMimeType: 'audio/mp4',
+      videoMimeType: 'video/mp4',
       codecs: 'mp4,mp4',
       audioCodec: 'mp4',
       videoCodec: 'mp4',
@@ -1423,6 +1425,8 @@ filterDescribe('Storage', storageSupport, () => {
       pixelAspectRatio: null,
       hdr: null,
       mimeType: 'text/vtt',
+      audioMimeType: null,
+      videoMimeType: null,
       codecs: 'vtt',
       audioCodec: null,
       videoCodec: null,
diff --git a/test/player_unit.js b/test/player_unit.js
index 69b5e62220..3b4eb3c6df 100644
--- a/test/player_unit.js
+++ b/test/player_unit.js
@@ -1115,6 +1115,8 @@ describe('Player', () => {
           pixelAspectRatio: '59:54',
           hdr: null,
           mimeType: 'video/mp4',
+          audioMimeType: 'audio/mp4',
+          videoMimeType: 'video/mp4',
           codecs: 'avc1.4d401f, mp4a.40.2',
           audioCodec: 'mp4a.40.2',
           videoCodec: 'avc1.4d401f',
@@ -1149,6 +1151,8 @@ describe('Player', () => {
           pixelAspectRatio: '59:54',
           hdr: null,
           mimeType: 'video/mp4',
+          audioMimeType: 'audio/mp4',
+          videoMimeType: 'video/mp4',
           codecs: 'avc1.4d401f, mp4a.40.2',
           audioCodec: 'mp4a.40.2',
           videoCodec: 'avc1.4d401f',
@@ -1183,6 +1187,8 @@ describe('Player', () => {
           pixelAspectRatio: '59:54',
           hdr: null,
           mimeType: 'video/mp4',
+          audioMimeType: 'audio/mp4',
+          videoMimeType: 'video/mp4',
           codecs: 'avc1.4d401f, mp4a.40.2',
           audioCodec: 'mp4a.40.2',
           videoCodec: 'avc1.4d401f',
@@ -1217,6 +1223,8 @@ describe('Player', () => {
           pixelAspectRatio: '59:54',
           hdr: null,
           mimeType: 'video/mp4',
+          audioMimeType: 'audio/mp4',
+          videoMimeType: 'video/mp4',
           codecs: 'avc1.4d401f, mp4a.40.2',
           audioCodec: 'mp4a.40.2',
           videoCodec: 'avc1.4d401f',
@@ -1251,6 +1259,8 @@ describe('Player', () => {
           pixelAspectRatio: '59:54',
           hdr: null,
           mimeType: 'video/mp4',
+          audioMimeType: 'audio/mp4',
+          videoMimeType: 'video/mp4',
           codecs: 'avc1.4d401f, mp4a.40.2',
           audioCodec: 'mp4a.40.2',
           videoCodec: 'avc1.4d401f',
@@ -1285,6 +1295,8 @@ describe('Player', () => {
           pixelAspectRatio: '59:54',
           hdr: null,
           mimeType: 'video/mp4',
+          audioMimeType: 'audio/mp4',
+          videoMimeType: 'video/mp4',
           codecs: 'avc1.4d401f, mp4a.40.2',
           audioCodec: 'mp4a.40.2',
           videoCodec: 'avc1.4d401f',
@@ -1319,6 +1331,8 @@ describe('Player', () => {
           pixelAspectRatio: '59:54',
           hdr: null,
           mimeType: 'video/mp4',
+          audioMimeType: 'audio/mp4',
+          videoMimeType: 'video/mp4',
           codecs: 'avc1.4d401f, mp4a.40.2',
           audioCodec: 'mp4a.40.2',
           videoCodec: 'avc1.4d401f',
@@ -1353,6 +1367,8 @@ describe('Player', () => {
           pixelAspectRatio: '59:54',
           hdr: null,
           mimeType: 'video/mp4',
+          audioMimeType: 'audio/mp4',
+          videoMimeType: 'video/mp4',
           codecs: 'avc1.4d401f, mp4a.40.2',
           audioCodec: 'mp4a.40.2',
           videoCodec: 'avc1.4d401f',
@@ -1384,6 +1400,8 @@ describe('Player', () => {
           label: 'Spanish',
           kind: 'caption',
           mimeType: 'text/vtt',
+          audioMimeType: null,
+          videoMimeType: null,
           codecs: null,
           audioCodec: null,
           videoCodec: null,
@@ -1418,6 +1436,8 @@ describe('Player', () => {
           label: 'English',
           kind: 'caption',
           mimeType: 'application/ttml+xml',
+          audioMimeType: null,
+          videoMimeType: null,
           codecs: null,
           audioCodec: null,
           videoCodec: null,
@@ -1452,6 +1472,8 @@ describe('Player', () => {
           label: 'English',
           kind: 'caption',
           mimeType: 'application/ttml+xml',
+          audioMimeType: null,
+          videoMimeType: null,
           codecs: null,
           audioCodec: null,
           videoCodec: null,
@@ -1489,6 +1511,8 @@ describe('Player', () => {
           label: null,
           kind: null,
           mimeType: 'image/jpeg',
+          audioMimeType: null,
+          videoMimeType: null,
           codecs: null,
           audioCodec: null,
           videoCodec: null,