diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index d50686f298..e701a89d6c 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -14,7 +14,8 @@
 * Add `HttpDataSource.getResponseCode` to provide the status code associated
   with the most recent HTTP response.
 * Fix initialization data handling for FLAC in MP4
-  ([#6396](https://github.com/google/ExoPlayer/issues/6396)).
+  ([#6396](https://github.com/google/ExoPlayer/issues/6396),
+  [#6397](https://github.com/google/ExoPlayer/issues/6397)).
 * Fix audio selection issue where languages are compared by bit rate
   ([#6335](https://github.com/google/ExoPlayer/issues/6335)).
 * Fix decoder selection for E-AC3 JOC streams
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java b/library/core/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java
index 0ffbdf0f80..c4e6ef17c4 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java
@@ -1148,7 +1148,16 @@ import java.util.List;
         System.arraycopy(opusMagic, 0, initializationData, 0, opusMagic.length);
         parent.setPosition(childPosition + Atom.HEADER_SIZE);
         parent.readBytes(initializationData, opusMagic.length, childAtomBodySize);
-      } else if (childAtomType == Atom.TYPE_dfLa || childAtomType == Atom.TYPE_alac) {
+      } else if (childAtomType == Atom.TYPE_dfLa) {
+        int childAtomBodySize = childAtomSize - Atom.FULL_HEADER_SIZE;
+        initializationData = new byte[4 + childAtomBodySize];
+        initializationData[0] = 0x66; // f
+        initializationData[1] = 0x4C; // L
+        initializationData[2] = 0x61; // a
+        initializationData[3] = 0x43; // C
+        parent.setPosition(childPosition + Atom.FULL_HEADER_SIZE);
+        parent.readBytes(initializationData, /* offset= */ 4, childAtomBodySize);
+      } else if (childAtomType == Atom.TYPE_alac) {
         int childAtomBodySize = childAtomSize - Atom.FULL_HEADER_SIZE;
         initializationData = new byte[childAtomBodySize];
         parent.setPosition(childPosition + Atom.FULL_HEADER_SIZE);