diff --git a/libraries/exoplayer/proguard-rules.txt b/libraries/exoplayer/proguard-rules.txt
index 7733da1f39..9e04184575 100644
--- a/libraries/exoplayer/proguard-rules.txt
+++ b/libraries/exoplayer/proguard-rules.txt
@@ -61,3 +61,13 @@
 -keepclasseswithmembers class androidx.media3.exoplayer.rtsp.RtspMediaSource$Factory {
   <init>();
 }
+
+# Constructors and methods accessed via reflection in CompositingVideoSinkProvider
+-dontnote androidx.media3.effect.PreviewingSingleInputVideoGraph$Factory
+-keepclasseswithmembers class androidx.media3.effect.PreviewingSingleInputVideoGraph$Factory {
+  <init>(androidx.media3.common.VideoFrameProcessor$Factory);
+}
+-dontnote androidx.media3.effect.DefaultVideoFrameProcessor$Factory$Builder
+-keepclasseswithmembers class androidx.media3.effect.DefaultVideoFrameProcessor$Factory$Builder {
+  build();
+}
diff --git a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/video/CompositingVideoSinkProvider.java b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/video/CompositingVideoSinkProvider.java
index d774014ed8..b7b9c1b900 100644
--- a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/video/CompositingVideoSinkProvider.java
+++ b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/video/CompositingVideoSinkProvider.java
@@ -827,7 +827,6 @@ public final class CompositingVideoSinkProvider
             Suppliers.memoize(
                 () -> {
                   try {
-                    // TODO: b/284964524- Add LINT and proguard checks for media3.effect reflection.
                     Class<?> defaultVideoFrameProcessorFactoryBuilderClass =
                         Class.forName(
                             "androidx.media3.effect.DefaultVideoFrameProcessor$Factory$Builder");