diff --git a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/DecoderCounters.java b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/DecoderCounters.java
index b5a54d1e45..954884027b 100644
--- a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/DecoderCounters.java
+++ b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/DecoderCounters.java
@@ -18,6 +18,7 @@ package androidx.media3.exoplayer;
 import static java.lang.Math.max;
 
 import androidx.media3.common.util.UnstableApi;
+import androidx.media3.common.util.Util;
 
 /**
  * Maintains decoder event counts, for debugging purposes only.
@@ -157,4 +158,34 @@ public final class DecoderCounters {
     totalVideoFrameProcessingOffsetUs += totalProcessingOffsetUs;
     videoFrameProcessingOffsetCount += count;
   }
+
+  @Override
+  public String toString() {
+    return Util.formatInvariant(
+        "DecoderCounters {\n "
+            + "decoderInits=%s,\n "
+            + "decoderReleases=%s\n "
+            + "queuedInputBuffers=%s\n "
+            + "skippedInputBuffers=%s\n "
+            + "renderedOutputBuffers=%s\n "
+            + "skippedOutputBuffers=%s\n "
+            + "droppedBuffers=%s\n "
+            + "droppedInputBuffers=%s\n "
+            + "maxConsecutiveDroppedBuffers=%s\n "
+            + "droppedToKeyframeEvents=%s\n "
+            + "totalVideoFrameProcessingOffsetUs=%s\n "
+            + "videoFrameProcessingOffsetCount=%s\n}",
+        decoderInitCount,
+        decoderReleaseCount,
+        queuedInputBufferCount,
+        skippedInputBufferCount,
+        renderedOutputBufferCount,
+        skippedOutputBufferCount,
+        droppedBufferCount,
+        droppedInputBufferCount,
+        maxConsecutiveDroppedBufferCount,
+        droppedToKeyframeCount,
+        totalVideoFrameProcessingOffsetUs,
+        videoFrameProcessingOffsetCount);
+  }
 }
diff --git a/libraries/test_utils/src/main/java/androidx/media3/test/utils/DecoderCountersUtil.java b/libraries/test_utils/src/main/java/androidx/media3/test/utils/DecoderCountersUtil.java
index 26a4362187..a7bd04fda3 100644
--- a/libraries/test_utils/src/main/java/androidx/media3/test/utils/DecoderCountersUtil.java
+++ b/libraries/test_utils/src/main/java/androidx/media3/test/utils/DecoderCountersUtil.java
@@ -45,7 +45,7 @@ public final class DecoderCountersUtil {
     counters.ensureUpdated();
     int actual = counters.skippedOutputBufferCount;
     assertWithMessage(
-            "Codec(" + name + ") skipped " + actual + " buffers. Expected " + expected + ".")
+            "Codec(%s) skipped an unexpected number of buffers. Counters:\n%s", name, counters)
         .that(actual)
         .isEqualTo(expected);
   }
@@ -68,32 +68,19 @@ public final class DecoderCountersUtil {
   public static void assertTotalBufferCount(
       String name, DecoderCounters counters, int minCount, int maxCount) {
     int actual = getTotalBufferCount(counters);
-    assertWithMessage(
-            "Codec("
-                + name
-                + ") output "
-                + actual
-                + " buffers. Expected in range ["
-                + minCount
-                + ", "
-                + maxCount
-                + "].")
-        .that(minCount <= actual && actual <= maxCount)
-        .isTrue();
+    assertWithMessage("Codec(%s) output too few buffers. Counters:\n%s", name, counters)
+        .that(actual)
+        .isAtLeast(minCount);
+    assertWithMessage("Codec(%s) output too many buffers. Counters:\n%s", name, counters)
+        .that(actual)
+        .isAtMost(maxCount);
   }
 
   public static void assertDroppedBufferLimit(String name, DecoderCounters counters, int limit) {
     counters.ensureUpdated();
     int actual = counters.droppedBufferCount;
     assertWithMessage(
-            "Codec("
-                + name
-                + ") was late decoding: "
-                + actual
-                + " buffers. "
-                + "Limit: "
-                + limit
-                + ".")
+            "Codec(%s) was late decoding too many buffers. Counters:\n%s: ", name, counters)
         .that(actual)
         .isAtMost(limit);
   }
@@ -103,14 +90,8 @@ public final class DecoderCountersUtil {
     counters.ensureUpdated();
     int actual = counters.maxConsecutiveDroppedBufferCount;
     assertWithMessage(
-            "Codec("
-                + name
-                + ") was late decoding: "
-                + actual
-                + " buffers consecutively. "
-                + "Limit: "
-                + limit
-                + ".")
+            "Codec(%s) was late decoding too many buffers consecutively. Counters:\n%s",
+            name, counters)
         .that(actual)
         .isAtMost(limit);
   }
@@ -119,16 +100,14 @@ public final class DecoderCountersUtil {
       String name, DecoderCounters counters, int minCount, int maxCount) {
     int actual = counters.videoFrameProcessingOffsetCount;
     assertWithMessage(
-            "Codec("
-                + name
-                + ") videoFrameProcessingOffsetSampleCount "
-                + actual
-                + ". Expected in range ["
-                + minCount
-                + ", "
-                + maxCount
-                + "].")
-        .that(minCount <= actual && actual <= maxCount)
-        .isTrue();
+            "Codec(%s) videoFrameProcessingOffsetSampleCount too low. Counters:\n%s",
+            name, counters)
+        .that(actual)
+        .isAtLeast(minCount);
+    assertWithMessage(
+            "Codec(%s) videoFrameProcessingOffsetSampleCount too high. Counters:\n%s",
+            name, counters)
+        .that(actual)
+        .isAtMost(maxCount);
   }
 }