diff --git a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java
index 573451ef6a..5c86876abd 100644
--- a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java
+++ b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java
@@ -386,7 +386,9 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
     // Fixed sample size raw audio may need to be rechunked.
     boolean isFixedSampleSizeRawAudio =
         sampleSizeBox.isFixedSampleSize()
-            && MimeTypes.AUDIO_RAW.equals(track.format.sampleMimeType)
+            && (MimeTypes.AUDIO_RAW.equals(track.format.sampleMimeType)
+            || MimeTypes.AUDIO_MLAW.equals(track.format.sampleMimeType)
+            || MimeTypes.AUDIO_ALAW.equals(track.format.sampleMimeType))
             && remainingTimestampDeltaChanges == 0
             && remainingTimestampOffsetChanges == 0
             && remainingSynchronizationSamples == 0;
@@ -406,8 +408,14 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
         chunkOffsetsBytes[chunkIterator.index] = chunkIterator.offset;
         chunkSampleCounts[chunkIterator.index] = chunkIterator.numSamples;
       }
-      int fixedSampleSize =
-          Util.getPcmFrameSize(track.format.pcmEncoding, track.format.channelCount);
+      int fixedSampleSize;
+      if (MimeTypes.AUDIO_MLAW.equals(track.format.sampleMimeType)
+          || MimeTypes.AUDIO_ALAW.equals(track.format.sampleMimeType)) {
+        fixedSampleSize = sampleSizeBox.isFixedSampleSize() ? sampleSizeBox.readNextSampleSize() : 1;
+      } else {
+        fixedSampleSize =
+            Util.getPcmFrameSize(track.format.pcmEncoding, track.format.channelCount);
+      }
       FixedSampleSizeRechunker.Results rechunkedResults =
           FixedSampleSizeRechunker.rechunk(
               fixedSampleSize, chunkOffsetsBytes, chunkSampleCounts, timestampDeltaInTimeUnits);