diff --git a/library/common/src/main/java/com/google/android/exoplayer2/audio/AudioProcessor.java b/library/common/src/main/java/com/google/android/exoplayer2/audio/AudioProcessor.java
index 3848b28674..23e2a4ce71 100644
--- a/library/common/src/main/java/com/google/android/exoplayer2/audio/AudioProcessor.java
+++ b/library/common/src/main/java/com/google/android/exoplayer2/audio/AudioProcessor.java
@@ -99,11 +99,15 @@ public interface AudioProcessor {
     }
   }
 
-  /** Exception thrown when a processor can't be configured for a given input audio format. */
+  /** Exception thrown when the given {@link AudioFormat} can not be handled. */
   final class UnhandledAudioFormatException extends Exception {
 
     public UnhandledAudioFormatException(AudioFormat inputAudioFormat) {
-      super("Unhandled format: " + inputAudioFormat);
+      this("Unhandled input format:", inputAudioFormat);
+    }
+
+    public UnhandledAudioFormatException(String message, AudioFormat audioFormat) {
+      super(message + " " + audioFormat);
     }
   }
 
diff --git a/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/AudioMixingAlgorithm.java b/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/AudioMixingAlgorithm.java
index 47741cafa5..138774038d 100644
--- a/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/AudioMixingAlgorithm.java
+++ b/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/AudioMixingAlgorithm.java
@@ -74,7 +74,8 @@ import java.nio.ByteBuffer;
       case C.ENCODING_PCM_FLOAT:
         return new FloatAudioMixingAlgorithm(mixingAudioFormat);
       default:
-        throw new UnhandledAudioFormatException(mixingAudioFormat);
+        throw new UnhandledAudioFormatException(
+            "No supported mixing algorithm available.", mixingAudioFormat);
     }
   }
 }