diff --git a/libraries/muxer/src/main/java/androidx/media3/muxer/Mp4Writer.java b/libraries/muxer/src/main/java/androidx/media3/muxer/Mp4Writer.java
index dcfb85eeff..ce42aee2bb 100644
--- a/libraries/muxer/src/main/java/androidx/media3/muxer/Mp4Writer.java
+++ b/libraries/muxer/src/main/java/androidx/media3/muxer/Mp4Writer.java
@@ -270,7 +270,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
     // Calculate the additional space required.
     long bytesNeededInMdat = 0L;
     for (Pair<BufferInfo, ByteBuffer> sample : track.pendingSamples) {
-      bytesNeededInMdat += sample.second.remaining();
+      bytesNeededInMdat += sample.second.limit();
     }
 
     // If the required number of bytes doesn't fit in the gap between the actual data and the moov