diff --git a/extensions/av1/src/main/java/com/google/android/exoplayer2/ext/av1/Libgav1VideoRenderer.java b/extensions/av1/src/main/java/com/google/android/exoplayer2/ext/av1/Libgav1VideoRenderer.java
index df1e6177e8..22b542843d 100644
--- a/extensions/av1/src/main/java/com/google/android/exoplayer2/ext/av1/Libgav1VideoRenderer.java
+++ b/extensions/av1/src/main/java/com/google/android/exoplayer2/ext/av1/Libgav1VideoRenderer.java
@@ -138,8 +138,13 @@ public class Libgav1VideoRenderer extends DecoderVideoRenderer {
         C.FORMAT_HANDLED, ADAPTIVE_SEAMLESS, TUNNELING_NOT_SUPPORTED);
   }
 
+  /**
+   * {@inheritDoc}
+   *
+   * @hide
+   */
   @Override
-  protected Gav1Decoder createDecoder(Format format, @Nullable CryptoConfig cryptoConfig)
+  protected final Gav1Decoder createDecoder(Format format, @Nullable CryptoConfig cryptoConfig)
       throws Gav1DecoderException {
     TraceUtil.beginSection("createGav1Decoder");
     int initialInputBufferSize =
diff --git a/extensions/ffmpeg/src/main/java/com/google/android/exoplayer2/ext/ffmpeg/FfmpegAudioRenderer.java b/extensions/ffmpeg/src/main/java/com/google/android/exoplayer2/ext/ffmpeg/FfmpegAudioRenderer.java
index 4ff8ded2a7..186c1f10ce 100644
--- a/extensions/ffmpeg/src/main/java/com/google/android/exoplayer2/ext/ffmpeg/FfmpegAudioRenderer.java
+++ b/extensions/ffmpeg/src/main/java/com/google/android/exoplayer2/ext/ffmpeg/FfmpegAudioRenderer.java
@@ -104,10 +104,15 @@ public final class FfmpegAudioRenderer extends DecoderAudioRenderer<FfmpegAudioD
   }
 
   @Override
-  public final @AdaptiveSupport int supportsMixedMimeTypeAdaptation() {
+  public @AdaptiveSupport int supportsMixedMimeTypeAdaptation() {
     return ADAPTIVE_NOT_SEAMLESS;
   }
 
+  /**
+   * {@inheritDoc}
+   *
+   * @hide
+   */
   @Override
   protected FfmpegAudioDecoder createDecoder(Format format, @Nullable CryptoConfig cryptoConfig)
       throws FfmpegDecoderException {
@@ -121,8 +126,13 @@ public final class FfmpegAudioRenderer extends DecoderAudioRenderer<FfmpegAudioD
     return decoder;
   }
 
+  /**
+   * {@inheritDoc}
+   *
+   * @hide
+   */
   @Override
-  public Format getOutputFormat(FfmpegAudioDecoder decoder) {
+  protected Format getOutputFormat(FfmpegAudioDecoder decoder) {
     Assertions.checkNotNull(decoder);
     return new Format.Builder()
         .setSampleMimeType(MimeTypes.AUDIO_RAW)
diff --git a/extensions/flac/src/main/java/com/google/android/exoplayer2/ext/flac/LibflacAudioRenderer.java b/extensions/flac/src/main/java/com/google/android/exoplayer2/ext/flac/LibflacAudioRenderer.java
index a03c9a271b..272413483e 100644
--- a/extensions/flac/src/main/java/com/google/android/exoplayer2/ext/flac/LibflacAudioRenderer.java
+++ b/extensions/flac/src/main/java/com/google/android/exoplayer2/ext/flac/LibflacAudioRenderer.java
@@ -106,6 +106,11 @@ public final class LibflacAudioRenderer extends DecoderAudioRenderer<FlacDecoder
     }
   }
 
+  /**
+   * {@inheritDoc}
+   *
+   * @hide
+   */
   @Override
   protected FlacDecoder createDecoder(Format format, @Nullable CryptoConfig cryptoConfig)
       throws FlacDecoderException {
@@ -116,6 +121,11 @@ public final class LibflacAudioRenderer extends DecoderAudioRenderer<FlacDecoder
     return decoder;
   }
 
+  /**
+   * {@inheritDoc}
+   *
+   * @hide
+   */
   @Override
   protected Format getOutputFormat(FlacDecoder decoder) {
     return getOutputFormat(decoder.getStreamMetadata());
diff --git a/extensions/opus/src/main/java/com/google/android/exoplayer2/ext/opus/LibopusAudioRenderer.java b/extensions/opus/src/main/java/com/google/android/exoplayer2/ext/opus/LibopusAudioRenderer.java
index 4debad0b66..794cbccf94 100644
--- a/extensions/opus/src/main/java/com/google/android/exoplayer2/ext/opus/LibopusAudioRenderer.java
+++ b/extensions/opus/src/main/java/com/google/android/exoplayer2/ext/opus/LibopusAudioRenderer.java
@@ -93,8 +93,13 @@ public class LibopusAudioRenderer extends DecoderAudioRenderer<OpusDecoder> {
     }
   }
 
+  /**
+   * {@inheritDoc}
+   *
+   * @hide
+   */
   @Override
-  protected OpusDecoder createDecoder(Format format, @Nullable CryptoConfig cryptoConfig)
+  protected final OpusDecoder createDecoder(Format format, @Nullable CryptoConfig cryptoConfig)
       throws OpusDecoderException {
     TraceUtil.beginSection("createOpusDecoder");
     @SinkFormatSupport
@@ -119,8 +124,13 @@ public class LibopusAudioRenderer extends DecoderAudioRenderer<OpusDecoder> {
     return decoder;
   }
 
+  /**
+   * {@inheritDoc} g
+   *
+   * @hide
+   */
   @Override
-  protected Format getOutputFormat(OpusDecoder decoder) {
+  protected final Format getOutputFormat(OpusDecoder decoder) {
     @C.PcmEncoding
     int pcmEncoding = decoder.outputFloat ? C.ENCODING_PCM_FLOAT : C.ENCODING_PCM_16BIT;
     return Util.getPcmFormat(pcmEncoding, decoder.channelCount, OpusDecoder.SAMPLE_RATE);