diff --git a/app/src/main/java/net/ossrs/sea/SrsEncoder.java b/app/src/main/java/net/ossrs/sea/SrsEncoder.java
index 48fe806..1f51fd4 100644
--- a/app/src/main/java/net/ossrs/sea/SrsEncoder.java
+++ b/app/src/main/java/net/ossrs/sea/SrsEncoder.java
@@ -464,7 +464,7 @@ public class SrsEncoder {
             String[] types = mci.getSupportedTypes();
             for (int j = 0; j < types.length; j++) {
                 if (types[j].equalsIgnoreCase(VCODEC)) {
-                    //Log.i(TAG, String.format("vencoder %s types: %s", mci.getName(), types[j]));
+                    Log.i(TAG, String.format("vencoder %s types: %s", mci.getName(), types[j]));
                     if (name == null) {
                         return mci;
                     }
@@ -482,9 +482,9 @@ public class SrsEncoder {
     // choose the right supported color format. @see below:
     private int chooseVideoEncoder() {
         // choose the encoder "video/avc":
-        //      1. select one when type matched.
-        //      2. perfer google avc.
-        //      3. perfer qcom avc.
+        //      1. select default one when type matched.
+        //      2. google avc is unusable.
+        //      3. choose qcom avc.
         vmci = chooseVideoEncoder(null);
         //vmci = chooseVideoEncoder("google");
         //vmci = chooseVideoEncoder("qcom");
diff --git a/app/src/main/java/net/ossrs/sea/rtmp/io/RtmpDecoder.java b/app/src/main/java/net/ossrs/sea/rtmp/io/RtmpDecoder.java
index 671204e..95c6357 100644
--- a/app/src/main/java/net/ossrs/sea/rtmp/io/RtmpDecoder.java
+++ b/app/src/main/java/net/ossrs/sea/rtmp/io/RtmpDecoder.java
@@ -39,10 +39,10 @@ public class RtmpDecoder {
 
         chunkStreamInfo.setPrevHeaderRx(header);
 
-        if (header.getPacketLength() > rtmpSessionInfo.getChunkSize()) {
+        if (header.getPacketLength() > rtmpSessionInfo.getRxChunkSize()) {
             //Log.d(TAG, "readPacket(): packet size (" + header.getPacketLength() + ") is bigger than chunk size (" + rtmpSessionInfo.getChunkSize() + "); storing chunk data");
             // This packet consists of more than one chunk; store the chunks in the chunk stream until everything is read
-            if (!chunkStreamInfo.storePacketChunk(in, rtmpSessionInfo.getChunkSize())) {
+            if (!chunkStreamInfo.storePacketChunk(in, rtmpSessionInfo.getRxChunkSize())) {
                 Log.d(TAG, " readPacket(): returning null because of incomplete packet");
                 return null; // packet is not yet complete
             } else {
@@ -59,7 +59,7 @@ public class RtmpDecoder {
                 SetChunkSize setChunkSize = new SetChunkSize(header);
                 setChunkSize.readBody(in);
                 Log.d(TAG, "readPacket(): Setting chunk size to: " + setChunkSize.getChunkSize());
-                rtmpSessionInfo.setChunkSize(setChunkSize.getChunkSize());                
+                rtmpSessionInfo.setRxChunkSize(setChunkSize.getChunkSize());
                 return null;
             }
             case ABORT:
diff --git a/app/src/main/java/net/ossrs/sea/rtmp/io/RtmpSessionInfo.java b/app/src/main/java/net/ossrs/sea/rtmp/io/RtmpSessionInfo.java
index 24813b8..927d02a 100644
--- a/app/src/main/java/net/ossrs/sea/rtmp/io/RtmpSessionInfo.java
+++ b/app/src/main/java/net/ossrs/sea/rtmp/io/RtmpSessionInfo.java
@@ -19,7 +19,8 @@ public class RtmpSessionInfo {
     private int totalBytesRead = 0;
     
     /** Default chunk size is 128 bytes */
-    private int chunkSize = 128;
+    private int rxChunkSize = 128;
+    private int txChunkSize = 128;
     private Map<Integer, ChunkStreamInfo> chunkChannels = new HashMap<Integer, ChunkStreamInfo>();
     private Map<Integer, String> invokedMethods = new ConcurrentHashMap<Integer, String>();
 
@@ -40,12 +41,20 @@ public class RtmpSessionInfo {
         return invokedMethods.put(transactionId, commandName);
     }
 
-    public int getChunkSize() {
-        return chunkSize;
+    public int getRxChunkSize() {
+        return rxChunkSize;
     }
 
-    public void setChunkSize(int chunkSize) {
-        this.chunkSize = chunkSize;
+    public void setRxChunkSize(int chunkSize) {
+        this.rxChunkSize = chunkSize;
+    }
+
+    public int getTxChunkSize() {
+        return txChunkSize;
+    }
+
+    public void setTxChunkSize(int chunkSize) {
+        this.txChunkSize = chunkSize;
     }
 
     public int getAcknowledgementWindowSize() {
diff --git a/app/src/main/java/net/ossrs/sea/rtmp/io/WriteThread.java b/app/src/main/java/net/ossrs/sea/rtmp/io/WriteThread.java
index de5db3e..b3857fd 100644
--- a/app/src/main/java/net/ossrs/sea/rtmp/io/WriteThread.java
+++ b/app/src/main/java/net/ossrs/sea/rtmp/io/WriteThread.java
@@ -41,7 +41,7 @@ public class WriteThread extends Thread {
                     RtmpPacket rtmpPacket = writeQueue.poll();
                     final ChunkStreamInfo chunkStreamInfo = rtmpSessionInfo.getChunkStreamInfo(rtmpPacket.getHeader().getChunkStreamId());
                     chunkStreamInfo.setPrevHeaderTx(rtmpPacket.getHeader());
-                    rtmpPacket.writeTo(out, rtmpSessionInfo.getChunkSize(), chunkStreamInfo);
+                    rtmpPacket.writeTo(out, rtmpSessionInfo.getTxChunkSize(), chunkStreamInfo);
                     Log.d(TAG, "WriteThread: wrote packet: " + rtmpPacket + ", size: " + rtmpPacket.getHeader().getPacketLength());
                     if (rtmpPacket instanceof Command) {
                         rtmpSessionInfo.addInvokedCommand(((Command) rtmpPacket).getTransactionId(), ((Command) rtmpPacket).getCommandName());