diff --git a/Player/avc-worker.js b/Player/avc-worker.js
index 6213b58..d412532 100644
--- a/Player/avc-worker.js
+++ b/Player/avc-worker.js
@@ -17,6 +17,11 @@ avc.onPictureDecoded = function (buffer, width, height) {
   if (config && config.sendBufferOnPictureDecoded !== undefined) {
     buffer = config.sendBufferOnPictureDecoded ? buffer : null;
   }
+  // 'buffer' is a view of a large ArrayBuffer. Only clone the portion in the
+  // view.
+  if (buffer) {
+    buffer = Uint8Array(buffer);
+  }
   socket.sendMessage("on-picture-decoded", {picture: buffer, width: width, height: height});
 }
 
diff --git a/Player/mp4.js b/Player/mp4.js
index 79a5ef0..df4770c 100644
--- a/Player/mp4.js
+++ b/Player/mp4.js
@@ -866,7 +866,9 @@ var MP4Player = (function reader() {
         if (this.useWorkers) {
           var avcWorker = this.avcWorker;
           video.getSampleNALUnits(pic).forEach(function (nal) {
-            avcWorker.sendMessage("decode-sample", nal);
+            // Copy the sample so that we only do a structured clone of the
+            // region of interest
+            avcWorker.sendMessage("decode-sample", Uint8Array(nal));
           });
         } else {
           var avc = this.avc;