diff --git a/media/libstagefright/MPEG4Writer.cpp b/media/libstagefright/MPEG4Writer.cpp
index e399cbe..a0a2891 100644
--- a/media/libstagefright/MPEG4Writer.cpp
+++ b/media/libstagefright/MPEG4Writer.cpp
@@ -567,6 +567,7 @@
     mDone = false;
     mThread = 0;
     mDriftTimeUs = 0;
+    mHasDolbyVision = false;
 
     // Following variables only need to be set for the first recording session.
     // And they will stay the same for all the recording sessions.
@@ -714,6 +715,7 @@
         // So we let the creation of the new track now and
         // assign FourCC codes later using getDoviFourCC()
         ALOGV("Add source mime '%s'", mime);
+        mHasDolbyVision = true;
     } else if (Track::getFourCCForMime(mime) == NULL) {
         ALOGE("Unsupported mime '%s'", mime);
         return ERROR_UNSUPPORTED;
@@ -1576,6 +1578,13 @@
                 break;
             }
         }
+        // The brand ‘dby1’ should be used in the compatible_brands field to indicate that the file
+        // is compliant with all Dolby Extensions. For details, refer to
+        // https://professional.dolby.com/siteassets/content-creation/dolby-vision-for-content-creators/dolby_vision_bitstreams_within_the_iso_base_media_file_format_dec2017.pdf
+        // Chapter 7, Dolby Vision Files.
+        if (fileType == OUTPUT_FORMAT_MPEG_4 && mHasDolbyVision) {
+            writeFourcc("dby1");
+        }
     }
 
     endBox();
diff --git a/media/libstagefright/include/media/stagefright/MPEG4Writer.h b/media/libstagefright/include/media/stagefright/MPEG4Writer.h
index cf76606..054a4b8 100644
--- a/media/libstagefright/include/media/stagefright/MPEG4Writer.h
+++ b/media/libstagefright/include/media/stagefright/MPEG4Writer.h
@@ -241,6 +241,8 @@
     std::map<uint32_t, ItemInfo> mItems;
     Vector<ItemProperty> mProperties;
 
+    bool mHasDolbyVision;
+
     // Writer thread handling
     status_t startWriterThread();
     status_t stopWriterThread();