diff --git a/app/src/main/java/net/ossrs/yasea/demo/MainActivity.java b/app/src/main/java/net/ossrs/yasea/demo/MainActivity.java
index 3a2cbb4..490c1b8 100644
--- a/app/src/main/java/net/ossrs/yasea/demo/MainActivity.java
+++ b/app/src/main/java/net/ossrs/yasea/demo/MainActivity.java
@@ -238,11 +238,6 @@ public class MainActivity extends AppCompatActivity implements RtmpHandler.RtmpL
     @Override
     public void onConfigurationChanged(Configuration newConfig) {
         super.onConfigurationChanged(newConfig);
-        if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
-            mPublisher.setPreviewRotation(90);
-        } else if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
-            mPublisher.setPreviewRotation(0);
-        }
         mPublisher.stopEncode();
         mPublisher.stopRecord();
         btnRecord.setText("record");
diff --git a/library/src/main/java/net/ossrs/yasea/SrsCameraView.java b/library/src/main/java/net/ossrs/yasea/SrsCameraView.java
index c550173..57cd3d8 100644
--- a/library/src/main/java/net/ossrs/yasea/SrsCameraView.java
+++ b/library/src/main/java/net/ossrs/yasea/SrsCameraView.java
@@ -1,12 +1,14 @@
 package net.ossrs.yasea;
 
 import android.content.Context;
+import android.content.res.Configuration;
 import android.graphics.ImageFormat;
 import android.graphics.SurfaceTexture;
 import android.hardware.Camera;
 import android.opengl.GLES20;
 import android.opengl.GLSurfaceView;
 import android.opengl.Matrix;
+import android.os.Build;
 import android.util.AttributeSet;
 
 import com.seu.magicfilter.base.gpuimage.GPUImageFilter;
@@ -45,6 +47,7 @@ public class SrsCameraView extends GLSurfaceView implements GLSurfaceView.Render
     private ByteBuffer mGLPreviewBuffer;
     private int mCamId = -1;
     private int mPreviewRotation = 90;
+    private int mPreviewOrientation = Configuration.ORIENTATION_PORTRAIT;
 
     private Thread worker;
     private final Object writeLock = new Object();
@@ -172,7 +175,7 @@ public class SrsCameraView extends GLSurfaceView implements GLSurfaceView.Render
     }
 
     private void deleteTextures() {
-        if(mOESTextureId != OpenGLUtils.NO_TEXTURE){
+        if (mOESTextureId != OpenGLUtils.NO_TEXTURE) {
             queueEvent(new Runnable() {
                 @Override
                 public void run() {
@@ -183,12 +186,28 @@ public class SrsCameraView extends GLSurfaceView implements GLSurfaceView.Render
         }
     }
 
-    public void setPreviewRotation(int rotation) {
-        mPreviewRotation = rotation;
-    }
-
     public void setCameraId(int id) {
         mCamId = id;
+        setPreviewOrientation(mPreviewOrientation);
+    }
+
+    public void setPreviewOrientation(int orientation) {
+        mPreviewOrientation = orientation;
+        Camera.CameraInfo info = new Camera.CameraInfo();
+        Camera.getCameraInfo(mCamId, info);
+        if (info.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
+            if (orientation == Configuration.ORIENTATION_PORTRAIT) {
+                mPreviewRotation = Build.VERSION.SDK_INT >= Build.VERSION_CODES.M ? 270 : 90;
+            } else if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
+                mPreviewRotation = Build.VERSION.SDK_INT >= Build.VERSION_CODES.M ? 180 : 0;
+            }
+        } else if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
+            if (orientation == Configuration.ORIENTATION_PORTRAIT) {
+                mPreviewRotation = 90;
+            } else if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
+                mPreviewRotation = 0;
+            }
+        }
     }
 
     public int getCameraId() {
@@ -293,8 +312,7 @@ public class SrsCameraView extends GLSurfaceView implements GLSurfaceView.Render
                 Camera.getCameraInfo(i, info);
                 if (info.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
                     backCamId = i;
-                }
-                if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
+                } else if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
                     frontCamId = i;
                     break;
                 }
diff --git a/library/src/main/java/net/ossrs/yasea/SrsEncoder.java b/library/src/main/java/net/ossrs/yasea/SrsEncoder.java
index 49268e4..6864887 100644
--- a/library/src/main/java/net/ossrs/yasea/SrsEncoder.java
+++ b/library/src/main/java/net/ossrs/yasea/SrsEncoder.java
@@ -31,7 +31,7 @@ public class SrsEncoder {
     public static int vLandscapeHeight = 720;
     public static int vOutWidth = 720;   // Note: the stride of resolution must be set as 16x for hard encoding with some chip like MTK
     public static int vOutHeight = 1280;  // Since Y component is quadruple size as U and V component, the stride must be set as 32x
-    public static int vBitrate = 500 * 1000;  // 500kbps
+    public static int vBitrate = 1200 * 1000;  // 1200kbps
     public static final int VFPS = 24;
     public static final int VGOP = 48;
     public static final int ASAMPLERATE = 44100;
@@ -98,7 +98,7 @@ public class SrsEncoder {
         // Since Y component is quadruple size as U and V component, the stride must be set as 32x
         if (!useSoftEncoder && vOutWidth % 32 != 0 || vOutHeight % 32 != 0) {
             if (vmci.getName().contains("MTK")) {
-                throw new AssertionError("MTK encoding revolution stride must be 32x");
+                //throw new AssertionError("MTK encoding revolution stride must be 32x");
             }
         }
 
diff --git a/library/src/main/java/net/ossrs/yasea/SrsPublisher.java b/library/src/main/java/net/ossrs/yasea/SrsPublisher.java
index 09db35e..2bf6cf2 100644
--- a/library/src/main/java/net/ossrs/yasea/SrsPublisher.java
+++ b/library/src/main/java/net/ossrs/yasea/SrsPublisher.java
@@ -187,13 +187,10 @@ public class SrsPublisher {
     }
 
     public void setScreenOrientation(int orientation) {
+        mCameraView.setPreviewOrientation(orientation);
         mEncoder.setScreenOrientation(orientation);
     }
 
-    public void setPreviewRotation(int rotation) {
-        mCameraView.setPreviewRotation(rotation);
-    }
-
     public void setVideoHDMode() {
         mEncoder.setVideoHDMode();
     }