diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index a319fa6ca49..0d86c4fbd35 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -95,6 +95,8 @@
         is malformed and should be re-encoded.
     *   Improve support for truncated Ogg streams
         ([#7608](https://github.com/google/ExoPlayer/issues/7608)).
+    *   Add support for MP4 H263 atom type
+        ([#9158](https://github.com/google/ExoPlayer/issues/9158)).
 *   HLS:
     *   Fix issue where playback of a live event could become stuck rather than
         transitioning to `STATE_ENDED` when the event ends
diff --git a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/Atom.java b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/Atom.java
index 1cb554151f1..83aeadd01da 100644
--- a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/Atom.java
+++ b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/Atom.java
@@ -99,6 +99,8 @@
   @SuppressWarnings("ConstantCaseForConstants")
   public static final int TYPE_s263 = 0x73323633;
 
+  public static final int TYPE_H263 = 0x48323633;
+
   @SuppressWarnings("ConstantCaseForConstants")
   public static final int TYPE_d263 = 0x64323633;
 
diff --git a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java
index 5da35527a5e..957bc4b4abc 100644
--- a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java
+++ b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java
@@ -938,6 +938,7 @@ private static StsdData parseStsd(
           || childAtomType == Atom.TYPE_hvc1
           || childAtomType == Atom.TYPE_hev1
           || childAtomType == Atom.TYPE_s263
+          || childAtomType == Atom.TYPE_H263
           || childAtomType == Atom.TYPE_vp08
           || childAtomType == Atom.TYPE_vp09
           || childAtomType == Atom.TYPE_av01
@@ -1100,6 +1101,8 @@ private static void parseVideoSampleEntry(
     @Nullable String mimeType = null;
     if (atomType == Atom.TYPE_m1v_) {
       mimeType = MimeTypes.VIDEO_MPEG;
+    } else if (atomType == Atom.TYPE_H263) {
+      mimeType = MimeTypes.VIDEO_H263;
     }
 
     @Nullable List<byte[]> initializationData = null;