diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 6747267be8..a5ea5c3d54 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -5,13 +5,16 @@
 * Add `Player.onPlaybackSuppressionReasonChanged` to allow listeners to
   detect playbacks suppressions (e.g. audio focus loss) directly
   ([#6203](https://github.com/google/ExoPlayer/issues/6203)).
-* DASH: Support `Label` elements
-  ([#6297](https://github.com/google/ExoPlayer/issues/6297)).
+* DASH:
+  * Support `Label` elements
+    ([#6297](https://github.com/google/ExoPlayer/issues/6297)).
+  * Support legacy audio channel configuration
+    ([#6523](https://github.com/google/ExoPlayer/issues/6523)).
 * HLS: Add support for ID3 in EMSG when using FMP4 streams
   ([spec](https://aomediacodec.github.io/av1-id3/)).
 * Metadata: Expose the raw ICY metadata through `IcyInfo`
   ([#6476](https://github.com/google/ExoPlayer/issues/6476)).
-* UI
+* UI:
   * Setting `app:played_color` on `PlayerView` and `PlayerControlView` no longer
     adjusts the colors of the scrubber handle , buffered and unplayed parts of
     the time bar. These can be set separately using `app:scrubber_color`,
diff --git a/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/manifest/DashManifestParser.java b/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/manifest/DashManifestParser.java
index 73e92a3d15..95e8c7f942 100644
--- a/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/manifest/DashManifestParser.java
+++ b/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/manifest/DashManifestParser.java
@@ -1113,10 +1113,13 @@ public class DashManifestParser extends DefaultHandler
   protected int parseAudioChannelConfiguration(XmlPullParser xpp)
       throws XmlPullParserException, IOException {
     String schemeIdUri = parseString(xpp, "schemeIdUri", null);
-    int audioChannels = "urn:mpeg:dash:23003:3:audio_channel_configuration:2011".equals(schemeIdUri)
-        ? parseInt(xpp, "value", Format.NO_VALUE)
-        : ("tag:dolby.com,2014:dash:audio_channel_configuration:2011".equals(schemeIdUri)
-        ? parseDolbyChannelConfiguration(xpp) : Format.NO_VALUE);
+    int audioChannels =
+        "urn:mpeg:dash:23003:3:audio_channel_configuration:2011".equals(schemeIdUri)
+            ? parseInt(xpp, "value", Format.NO_VALUE)
+            : ("tag:dolby.com,2014:dash:audio_channel_configuration:2011".equals(schemeIdUri)
+                    || "urn:dolby:dash:audio_channel_configuration:2011".equals(schemeIdUri)
+                ? parseDolbyChannelConfiguration(xpp)
+                : Format.NO_VALUE);
     do {
       xpp.next();
     } while (!XmlPullParserUtil.isEndTag(xpp, "AudioChannelConfiguration"));
@@ -1491,7 +1494,8 @@ public class DashManifestParser extends DefaultHandler
   /**
    * Parses the number of channels from the value attribute of an AudioElementConfiguration with
    * schemeIdUri "tag:dolby.com,2014:dash:audio_channel_configuration:2011", as defined by table E.5
-   * in ETSI TS 102 366.
+   * in ETSI TS 102 366, or the legacy schemeIdUri
+   * "urn:dolby:dash:audio_channel_configuration:2011".
    *
    * @param xpp The parser from which to read.
    * @return The parsed number of channels, or {@link Format#NO_VALUE} if the channel count could