diff --git a/app/build.gradle b/app/build.gradle
index c25a65a1..df3cd9b6 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -5,7 +5,7 @@ plugins {
 // 10,00,000 major-minor-build
 def AppMajorVersion = 1
 def AppMinorVersion = 0
-def AppBuildNumber = 138
+def AppBuildNumber = 139
 
 def AppVersionName = AppMajorVersion + "." + AppMinorVersion + "." + AppBuildNumber
 def AppVersionCode = AppMajorVersion * 100000 + AppMinorVersion * 1000 + AppBuildNumber
diff --git a/app/src/main/java/com/xypower/mpapp/v2/Camera2VideoActivity.java b/app/src/main/java/com/xypower/mpapp/v2/Camera2VideoActivity.java
index 1e6c52c6..e45ab8fa 100644
--- a/app/src/main/java/com/xypower/mpapp/v2/Camera2VideoActivity.java
+++ b/app/src/main/java/com/xypower/mpapp/v2/Camera2VideoActivity.java
@@ -52,6 +52,7 @@ import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
+import java.util.concurrent.Semaphore;
 
 public class Camera2VideoActivity extends AppCompatActivity {
 
@@ -94,6 +95,9 @@ public class Camera2VideoActivity extends AppCompatActivity {
 
     private int mTimeMask = 0;
     private int mStatusBarHeight = -1;
+    private long mOsdTs = 0;
+    private Semaphore mOSDSemaphore = new Semaphore(0);
+    private Thread mOsdThread = null;
 
     private static class OSD_ITEM
     {
@@ -134,12 +138,17 @@ public class Camera2VideoActivity extends AppCompatActivity {
             }
 
             // updateOSD(ts);
-            initOSD(ts);
+            Bitmap bitmap = mBitmap;
+            mBitmap = null;
+            mOSDFilter.updateBitmap(bitmap);
+
+            mBitmap = Bitmap.createBitmap(mVideoWidth, mVideoHeight, Bitmap.Config.ARGB_8888);
+            mOsdTs = ts;
+            mOSDSemaphore.release();
             mHandler.postDelayed(this, 1000 - ms);
         }
     };
 
-
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -261,6 +270,7 @@ public class Camera2VideoActivity extends AppCompatActivity {
                 mTimeMask |= TIME_MASK_RB_ML;
             }
         }
+
         if (!TextUtils.isEmpty(mOSDLeftBottom)) {
             mOSDLeftBottom = mOSDLeftBottom.replace("\r\n", "\n");
             mOSDLeftBottom = mOSDLeftBottom.replace("\n\r", "\n");
@@ -278,20 +288,72 @@ public class Camera2VideoActivity extends AppCompatActivity {
 
         mHandler = new Handler();
 
+        mOsdThread = new Thread(new Runnable() {
+            @Override
+            public void run() {
+                while (true) {
+                    try {
+                        mOSDSemaphore.acquire();
+                    } catch (Exception ex) {
+
+                    }
+
+                    if (mOsdTs == -1) {
+                        break;
+                    }
+
+                    updateOSD(mOsdTs);
+                }
+            }
+        });
+
+        mOsdThread.start();
+
+        if (!TextUtils.isEmpty(mOSDLeftTop) || !TextUtils.isEmpty(mOSDLeftTop) || !TextUtils.isEmpty(mOSDLeftTop) || !TextUtils.isEmpty(mOSDLeftTop)) {
+            mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
+            mPaint.setStyle(Paint.Style.FILL);
+            mPaint.setColor(Color.WHITE);
+            int fontSize = DEFAULT_FONT_SIZE;
+            mPaint.setTextSize(fontSize);
+
+            mPaintStroker = new Paint(Paint.ANTI_ALIAS_FLAG);
+            mPaintStroker.setStyle(Paint.Style.STROKE);
+            mPaintStroker.setColor(Color.BLACK);
+            mPaintStroker.setTextSize(fontSize);
+            mPaintStroker.setStrokeWidth(1);
+
+            mBitmap = Bitmap.createBitmap(mVideoWidth, mVideoHeight, Bitmap.Config.ARGB_8888);
+
+            Canvas canvas = new Canvas(mBitmap);
+            canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
+
+            mOSDFilter = new GlWatermarkFilter(mBitmap);
+
+            long ts = System.currentTimeMillis();
+
+            initOSD(ts);
+
+            mOsdTs = ts + 1000;
+            long ms = ts % 1000;
+            mOSDSemaphore.release();
+            mHandler.postDelayed(mTimerRunnable, 1000 - ms);
+        }
+
         mHandler.postDelayed(new Runnable() {
             @Override
             public void run() {
                 mNextVideoAbsolutePath = getVideoFilePath();
+
                 mGPUCameraRecorder.start(mNextVideoAbsolutePath);
             }
-        }, 200);
+        }, 32);
 
         mHandler.postDelayed(new Runnable() {
             @Override
             public void run() {
                 mGPUCameraRecorder.stop();
             }
-        }, 200 + mDuration * 1000);
+        }, 48 + mDuration * 1000);
 
         // getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
     }
@@ -600,27 +662,6 @@ public class Camera2VideoActivity extends AppCompatActivity {
 
         runOnUiThread(() -> {
 
-            if (!TextUtils.isEmpty(mOSDLeftTop) || !TextUtils.isEmpty(mOSDLeftTop) || !TextUtils.isEmpty(mOSDLeftTop) || !TextUtils.isEmpty(mOSDLeftTop)) {
-                mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
-                mPaint.setStyle(Paint.Style.FILL);
-                mPaint.setColor(Color.WHITE);
-                int fontSize = DEFAULT_FONT_SIZE;
-                mPaint.setTextSize(fontSize);
-
-                mPaintStroker = new Paint(Paint.ANTI_ALIAS_FLAG);
-                mPaintStroker.setStyle(Paint.Style.STROKE);
-                mPaintStroker.setColor(Color.BLACK);
-                mPaintStroker.setTextSize(fontSize);
-                mPaintStroker.setStrokeWidth(1);
-
-                mBitmap = Bitmap.createBitmap(mVideoWidth, mVideoHeight, Bitmap.Config.ARGB_8888);
-
-                Canvas canvas = new Canvas(mBitmap);
-                canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
-
-                mOSDFilter = new GlWatermarkFilter(mBitmap);
-            }
-
             FrameLayout frameLayout = findViewById(R.id.wrap_view);
             frameLayout.removeAllViews();
             mPreviewView = null;
@@ -644,6 +685,8 @@ public class Camera2VideoActivity extends AppCompatActivity {
             mNextVideoAbsolutePath = getVideoFilePath(this);
         }
 
+
+
         mGPUCameraRecorder = new GPUCameraRecorderBuilder(this, mPreviewView)
                 //.recordNoFilter(true)
                 .cameraRecordListener(new CameraRecordListener() {
@@ -655,6 +698,8 @@ public class Camera2VideoActivity extends AppCompatActivity {
                     @Override
                     public void onRecordComplete() {
                         mHandler.removeCallbacks(mTimerRunnable);
+                        mOsdTs = -1;
+                        mOSDSemaphore.release();
                         exportMp4ToGallery(getApplicationContext(), mNextVideoAbsolutePath);
                         broadcastVideoFile(true, mNextVideoAbsolutePath);
                         mHandler.postDelayed(new Runnable() {
@@ -668,12 +713,7 @@ public class Camera2VideoActivity extends AppCompatActivity {
                     @Override
                     public void onRecordStart() {
 
-                        if (mTimeMask != 0) {
-                            long ts = System.currentTimeMillis();
-                            long ms = ts % 1000;
-                            initOSD(ts - ms);
-                            mHandler.postDelayed(mTimerRunnable, 1000 - ms);
-                        }
+
 
                     }
 
diff --git a/gpuv/src/main/java/com/xypower/gpuv/egl/filter/GlWatermarkFilter.java b/gpuv/src/main/java/com/xypower/gpuv/egl/filter/GlWatermarkFilter.java
index 6a265971..07f0da9a 100644
--- a/gpuv/src/main/java/com/xypower/gpuv/egl/filter/GlWatermarkFilter.java
+++ b/gpuv/src/main/java/com/xypower/gpuv/egl/filter/GlWatermarkFilter.java
@@ -9,7 +9,9 @@ import android.util.Log;
 
 public class GlWatermarkFilter extends GlOverlayFilter {
 
+    private Object mLocker = new Object();
     private Bitmap bitmap;
+    private boolean invalidated = true;
     private Position position = Position.LEFT_TOP;
 
     public GlWatermarkFilter(Bitmap bitmap) {
@@ -22,12 +24,28 @@ public class GlWatermarkFilter extends GlOverlayFilter {
         this.position = position;
     }
 
+    public void updateBitmap(Bitmap bm) {
+        Bitmap oldBitmap = null;
+        synchronized (mLocker) {
+            invalidated = true;
+            oldBitmap = bitmap;
+            bitmap = bm;
+        }
+
+        if (oldBitmap != null) {
+            // oldBitmap.recycle();
+        }
+    }
+
     @Override
     protected void drawCanvas(Canvas canvas) {
-        synchronized (bitmap) {
+        synchronized (mLocker) {
             Log.d("OSD", "drawCanvas");
-            canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
-            canvas.drawBitmap(bitmap, null, canvas.getClipBounds(), null);
+            if (invalidated) {
+                canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
+                canvas.drawBitmap(bitmap, null, canvas.getClipBounds(), null);
+                invalidated = false;
+            }
         }
 
         /*