diff --git a/gpuv/src/main/java/com/xypower/gpuv/camerarecorder/CameraThread.java b/gpuv/src/main/java/com/xypower/gpuv/camerarecorder/CameraThread.java
index 419e3c71..abedb680 100644
--- a/gpuv/src/main/java/com/xypower/gpuv/camerarecorder/CameraThread.java
+++ b/gpuv/src/main/java/com/xypower/gpuv/camerarecorder/CameraThread.java
@@ -6,6 +6,7 @@ import android.graphics.SurfaceTexture;
 import android.hardware.camera2.*;
 import android.hardware.camera2.params.MeteringRectangle;
 import android.hardware.camera2.params.StreamConfigurationMap;
+import android.os.Build;
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Looper;
diff --git a/gpuv/src/main/java/com/xypower/gpuv/camerarecorder/GPUCameraRecorderBuilder.java b/gpuv/src/main/java/com/xypower/gpuv/camerarecorder/GPUCameraRecorderBuilder.java
index 1f585e7e..a9dbf3f5 100644
--- a/gpuv/src/main/java/com/xypower/gpuv/camerarecorder/GPUCameraRecorderBuilder.java
+++ b/gpuv/src/main/java/com/xypower/gpuv/camerarecorder/GPUCameraRecorderBuilder.java
@@ -9,7 +9,6 @@ import android.hardware.camera2.CameraManager;
 import android.opengl.GLSurfaceView;
 import android.util.Log;
 import android.view.Surface;
-
 import com.xypower.gpuv.egl.filter.GlFilter;
 
 
diff --git a/gpuv/src/main/java/com/xypower/gpuv/egl/GlPreviewRenderer.java b/gpuv/src/main/java/com/xypower/gpuv/egl/GlPreviewRenderer.java
index 047ecf59..da6c4f00 100644
--- a/gpuv/src/main/java/com/xypower/gpuv/egl/GlPreviewRenderer.java
+++ b/gpuv/src/main/java/com/xypower/gpuv/egl/GlPreviewRenderer.java
@@ -7,7 +7,6 @@ import android.opengl.GLSurfaceView;
 import android.opengl.Matrix;
 import android.os.Handler;
 import android.util.Size;
-
 import com.xypower.gpuv.camerarecorder.capture.MediaVideoEncoder;
 import com.xypower.gpuv.egl.filter.GlFilter;
 
@@ -16,6 +15,7 @@ import javax.microedition.khronos.egl.EGLConfig;
 import static android.opengl.GLES20.*;
 
 
+
 public class GlPreviewRenderer extends GlFrameBufferObjectRenderer implements SurfaceTexture.OnFrameAvailableListener {
 
     private final Handler handler = new Handler();
@@ -282,7 +282,7 @@ public class GlPreviewRenderer extends GlFrameBufferObjectRenderer implements Su
 
     public void setAngle(int angle) {
         this.angle = angle;
-        if (angle == 90 || angle == 270) {
+        if (angle == 180 || angle == 0) {
             aspectRatio = (float) cameraResolution.getWidth() / cameraResolution.getHeight();
         } else {
             aspectRatio = (float) cameraResolution.getHeight() / cameraResolution.getWidth();