diff --git a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/chunk/SingleSampleMediaChunk.java b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/chunk/SingleSampleMediaChunk.java
index 2880a4215a..b4022f931d 100644
--- a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/chunk/SingleSampleMediaChunk.java
+++ b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/chunk/SingleSampleMediaChunk.java
@@ -22,13 +22,22 @@ import androidx.media3.common.util.UnstableApi;
 import androidx.media3.datasource.DataSource;
 import androidx.media3.datasource.DataSourceUtil;
 import androidx.media3.datasource.DataSpec;
+import androidx.media3.exoplayer.ExoPlayer;
+import androidx.media3.exoplayer.text.TextRenderer;
 import androidx.media3.extractor.DefaultExtractorInput;
 import androidx.media3.extractor.ExtractorInput;
 import androidx.media3.extractor.TrackOutput;
 import java.io.IOException;
 
-/** A {@link BaseMediaChunk} for chunks consisting of a single raw sample. */
+/**
+ * @deprecated The only use for this class is subtitle playback, but it is only compatible with
+ *     legacy subtitle decoding, which is not supported by default. Users of this class almost
+ *     certainly need to {@linkplain TextRenderer#experimentalSetLegacyDecodingEnabled(boolean)
+ *     enable legacy subtitle decoding} on their {@link ExoPlayer} instance in order to avoid
+ *     playback errors when trying to play subtitles.
+ */
 @UnstableApi
+@Deprecated
 public final class SingleSampleMediaChunk extends BaseMediaChunk {
 
   private final @C.TrackType int trackType;
diff --git a/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/DefaultDashChunkSource.java b/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/DefaultDashChunkSource.java
index 2adcbf2046..e94de25ea3 100644
--- a/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/DefaultDashChunkSource.java
+++ b/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/DefaultDashChunkSource.java
@@ -762,6 +762,9 @@ public class DefaultDashChunkSource implements DashChunkSource {
         representationHolder.chunkExtractor);
   }
 
+  // TODO: b/289983417 - Stop using deprecated SingleSampleMediaChunk when legacy subtitle decoding
+  // is no longer supported.
+  @SuppressWarnings("deprecation")
   protected Chunk newMediaChunk(
       RepresentationHolder representationHolder,
       DataSource dataSource,