diff --git a/build.gradle b/build.gradle
index cfce2ca..8998434 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:2.3.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/library/src/main/java/net/ossrs/yasea/SrsEncoder.java b/library/src/main/java/net/ossrs/yasea/SrsEncoder.java
index 6915fe8..cbc235c 100644
--- a/library/src/main/java/net/ossrs/yasea/SrsEncoder.java
+++ b/library/src/main/java/net/ossrs/yasea/SrsEncoder.java
@@ -328,15 +328,13 @@ public class SrsEncoder {
 
     // when got encoded h264 es stream.
     private void onEncodedAnnexbFrame(ByteBuffer es, MediaCodec.BufferInfo bi) {
-        ByteBuffer record = es.duplicate();
-        mp4Muxer.writeSampleData(videoMp4Track, record, bi);
+        mp4Muxer.writeSampleData(videoMp4Track, es.duplicate(), bi);
         flvMuxer.writeSampleData(videoFlvTrack, es, bi);
     }
 
     // when got encoded aac raw stream.
     private void onEncodedAacFrame(ByteBuffer es, MediaCodec.BufferInfo bi) {
-        ByteBuffer record = es.duplicate();
-        mp4Muxer.writeSampleData(audioMp4Track, record, bi);
+        mp4Muxer.writeSampleData(audioMp4Track, es.duplicate(), bi);
         flvMuxer.writeSampleData(audioFlvTrack, es, bi);
     }