diff --git a/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/DefaultCodecFactory.java b/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/DefaultCodecFactory.java
index c7ce23cf9e..503b7af725 100644
--- a/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/DefaultCodecFactory.java
+++ b/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/DefaultCodecFactory.java
@@ -294,7 +294,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
           mediaCodecName,
           isDecoder
               ? TransformationException.ERROR_CODE_DECODING_FORMAT_UNSUPPORTED
-              : TransformationException.ERROR_CODE_ENCODING_FORMAT_UNSUPPORTED);
+              : TransformationException.ERROR_CODE_OUTPUT_FORMAT_UNSUPPORTED);
     }
     return TransformationException.createForUnexpected(cause);
   }
diff --git a/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformationException.java b/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformationException.java
index c74901730a..0c4fcef310 100644
--- a/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformationException.java
+++ b/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformationException.java
@@ -69,10 +69,9 @@ public final class TransformationException extends Exception {
         ERROR_CODE_DECODING_FORMAT_UNSUPPORTED,
         ERROR_CODE_ENCODER_INIT_FAILED,
         ERROR_CODE_ENCODING_FAILED,
-        ERROR_CODE_ENCODING_FORMAT_UNSUPPORTED,
+        ERROR_CODE_OUTPUT_FORMAT_UNSUPPORTED,
         ERROR_CODE_GL_INIT_FAILED,
         ERROR_CODE_GL_PROCESSING_FAILED,
-        ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED,
         ERROR_CODE_MUXING_FAILED,
       })
   public @interface ErrorCode {}
@@ -146,8 +145,13 @@ public final class TransformationException extends Exception {
   public static final int ERROR_CODE_ENCODER_INIT_FAILED = 4001;
   /** Caused by a failure while trying to encode media samples. */
   public static final int ERROR_CODE_ENCODING_FAILED = 4002;
-  /** Caused by requesting to encode content in a format that is not supported by the device. */
-  public static final int ERROR_CODE_ENCODING_FORMAT_UNSUPPORTED = 4003;
+  /**
+   * Caused by the output format for a track not being supported.
+   *
+   * <p>Supported output formats are limited by the muxer's capabilities and the {@link
+   * Codec.DecoderFactory encoders} available.
+   */
+  public static final int ERROR_CODE_OUTPUT_FORMAT_UNSUPPORTED = 4003;
 
   // Video editing errors (5xxx).
 
@@ -157,16 +161,8 @@ public final class TransformationException extends Exception {
   public static final int ERROR_CODE_GL_PROCESSING_FAILED = 5002;
 
   // Muxing errors (6xxx).
-
-  /**
-   * Caused by an output sample MIME type inferred from the input not being supported by the muxer.
-   *
-   * <p>Use {@link TransformationRequest.Builder#setAudioMimeType(String)} or {@link
-   * TransformationRequest.Builder#setVideoMimeType(String)} to transcode to a supported MIME type.
-   */
-  public static final int ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED = 6001;
   /** Caused by a failure while muxing media samples. */
-  public static final int ERROR_CODE_MUXING_FAILED = 6002;
+  public static final int ERROR_CODE_MUXING_FAILED = 6001;
 
   private static final ImmutableBiMap<String, @ErrorCode Integer> NAME_TO_ERROR_CODE =
       new ImmutableBiMap.Builder<String, @ErrorCode Integer>()
@@ -185,12 +181,9 @@ public final class TransformationException extends Exception {
           .put("ERROR_CODE_DECODING_FORMAT_UNSUPPORTED", ERROR_CODE_DECODING_FORMAT_UNSUPPORTED)
           .put("ERROR_CODE_ENCODER_INIT_FAILED", ERROR_CODE_ENCODER_INIT_FAILED)
           .put("ERROR_CODE_ENCODING_FAILED", ERROR_CODE_ENCODING_FAILED)
-          .put("ERROR_CODE_ENCODING_FORMAT_UNSUPPORTED", ERROR_CODE_ENCODING_FORMAT_UNSUPPORTED)
+          .put("ERROR_CODE_OUTPUT_FORMAT_UNSUPPORTED", ERROR_CODE_OUTPUT_FORMAT_UNSUPPORTED)
           .put("ERROR_CODE_GL_INIT_FAILED", ERROR_CODE_GL_INIT_FAILED)
           .put("ERROR_CODE_GL_PROCESSING_FAILED", ERROR_CODE_GL_PROCESSING_FAILED)
-          .put(
-              "ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED",
-              ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED)
           .put("ERROR_CODE_MUXING_FAILED", ERROR_CODE_MUXING_FAILED)
           .buildOrThrow();
 
diff --git a/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerAudioRenderer.java b/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerAudioRenderer.java
index 5eac1382ee..7925a0ec45 100644
--- a/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerAudioRenderer.java
+++ b/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerAudioRenderer.java
@@ -75,7 +75,7 @@ import com.google.android.exoplayer2.source.SampleStream.ReadDataResult;
               "The output sample MIME inferred from the input format is not supported by the muxer."
                   + " Sample MIME type: "
                   + sampleMimeType),
-          TransformationException.ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED);
+          TransformationException.ERROR_CODE_OUTPUT_FORMAT_UNSUPPORTED);
     }
     if (shouldPassthrough(inputFormat)) {
       samplePipeline = new PassthroughSamplePipeline(inputFormat);
diff --git a/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerVideoRenderer.java b/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerVideoRenderer.java
index 82968f888f..18d3cb996f 100644
--- a/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerVideoRenderer.java
+++ b/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerVideoRenderer.java
@@ -84,7 +84,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
               "The output sample MIME inferred from the input format is not supported by the muxer."
                   + " Sample MIME type: "
                   + sampleMimeType),
-          TransformationException.ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED);
+          TransformationException.ERROR_CODE_OUTPUT_FORMAT_UNSUPPORTED);
     }
     if (shouldPassthrough(inputFormat)) {
       samplePipeline = new PassthroughSamplePipeline(inputFormat);
diff --git a/library/transformer/src/test/java/com/google/android/exoplayer2/transformer/TransformerTest.java b/library/transformer/src/test/java/com/google/android/exoplayer2/transformer/TransformerTest.java
index 376a0e08b4..3dc75ca189 100644
--- a/library/transformer/src/test/java/com/google/android/exoplayer2/transformer/TransformerTest.java
+++ b/library/transformer/src/test/java/com/google/android/exoplayer2/transformer/TransformerTest.java
@@ -359,7 +359,7 @@ public final class TransformerTest {
 
     assertThat(exception).hasCauseThat().isInstanceOf(IllegalArgumentException.class);
     assertThat(exception.errorCode)
-        .isEqualTo(TransformationException.ERROR_CODE_ENCODING_FORMAT_UNSUPPORTED);
+        .isEqualTo(TransformationException.ERROR_CODE_OUTPUT_FORMAT_UNSUPPORTED);
   }
 
   @Test
@@ -403,7 +403,7 @@ public final class TransformerTest {
 
     assertThat(exception).hasCauseThat().isInstanceOf(IllegalArgumentException.class);
     assertThat(exception.errorCode)
-        .isEqualTo(TransformationException.ERROR_CODE_ENCODING_FORMAT_UNSUPPORTED);
+        .isEqualTo(TransformationException.ERROR_CODE_OUTPUT_FORMAT_UNSUPPORTED);
   }
 
   @Test
@@ -434,7 +434,7 @@ public final class TransformerTest {
     assertThat(exception).hasCauseThat().isInstanceOf(IllegalArgumentException.class);
     assertThat(exception).hasCauseThat().hasMessageThat().contains("audio");
     assertThat(exception.errorCode)
-        .isEqualTo(TransformationException.ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED);
+        .isEqualTo(TransformationException.ERROR_CODE_OUTPUT_FORMAT_UNSUPPORTED);
   }
 
   @Test
@@ -453,7 +453,7 @@ public final class TransformerTest {
     assertThat(exception).hasCauseThat().isInstanceOf(IllegalArgumentException.class);
     assertThat(exception).hasCauseThat().hasMessageThat().contains("video");
     assertThat(exception.errorCode)
-        .isEqualTo(TransformationException.ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED);
+        .isEqualTo(TransformationException.ERROR_CODE_OUTPUT_FORMAT_UNSUPPORTED);
   }
 
   @Test