diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 5dc4b0f6f7..5ef08f3043 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -59,6 +59,8 @@
     *   Matroska: Add support for 32-bit floating point PCM, and 8-bit and
         16-bit big endian integer PCM
         ([#8142](https://github.com/google/ExoPlayer/issues/8142)).
+    *   MP4: Add support for mpeg1 video box
+        ([#8257](https://github.com/google/ExoPlayer/issues/8257)).
 *   DRM:
     *   Fix playback failure when switching from PlayReady protected content to
         Widevine or Clearkey protected content in a playlist.
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 71e6c69887..1a19358b57 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
@@ -280,6 +280,9 @@ import java.util.List;
   @SuppressWarnings("ConstantCaseForConstants")
   public static final int TYPE_TTML = 0x54544d4c;
 
+  @SuppressWarnings("ConstantCaseForConstants")
+  public static final int TYPE_m1v_ = 0x6d317620;
+
   @SuppressWarnings("ConstantCaseForConstants")
   public static final int TYPE_mp4v = 0x6d703476;
 
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 58cb57f261..551ebc3ea3 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
@@ -853,6 +853,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
       if (childAtomType == Atom.TYPE_avc1
           || childAtomType == Atom.TYPE_avc3
           || childAtomType == Atom.TYPE_encv
+          || childAtomType == Atom.TYPE_m1v_
           || childAtomType == Atom.TYPE_mp4v
           || childAtomType == Atom.TYPE_hvc1
           || childAtomType == Atom.TYPE_hev1
@@ -993,8 +994,12 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
     //   drmInitData = null;
     // }
 
-    @Nullable List<byte[]> initializationData = null;
     @Nullable String mimeType = null;
+    if (atomType == Atom.TYPE_m1v_) {
+      mimeType = MimeTypes.VIDEO_MPEG;
+    }
+
+    @Nullable List<byte[]> initializationData = null;
     @Nullable String codecs = null;
     @Nullable byte[] projectionData = null;
     @C.StereoMode