diff --git a/JianGongYun/JianGongYun.csproj b/JianGongYun/JianGongYun.csproj
index aa6d4da..354b709 100644
--- a/JianGongYun/JianGongYun.csproj
+++ b/JianGongYun/JianGongYun.csproj
@@ -16,12 +16,12 @@
     <PackageReference Include="CommonServiceLocator" Version="2.0.5" />
     <PackageReference Include="MvvmLightLibs" Version="5.4.1.1" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
-    <PackageReference Include="OpenCvSharp4.runtime.win" Version="4.5.1.20201226" />
-    <PackageReference Include="OpenCvSharp4.WpfExtensions" Version="4.5.1.20201226" />
+    <PackageReference Include="OpenCvSharp4.runtime.win" Version="4.5.1.20201229" />
+    <PackageReference Include="OpenCvSharp4.WpfExtensions" Version="4.5.1.20201229" />
     <PackageReference Include="zlib.net" Version="1.0.4" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' != 'net45'">
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="4.7.0" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="5.0.0" />
   </ItemGroup>
   <ItemGroup>
     <Compile Update="Views\Window2.xaml.cs">
@@ -52,7 +52,7 @@
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
     <PackageReference Include="OpenCvSharp4">
-      <Version>4.5.1.20201226</Version>
+      <Version>4.5.1.20201229</Version>
     </PackageReference>
   </ItemGroup>
   <Target Name="PostBuild" AfterTargets="PostBuildEvent">
diff --git a/JianGongYun/TRTC/LiveClassroom.cs b/JianGongYun/TRTC/LiveClassroom.cs
index c441623..ed30a0c 100644
--- a/JianGongYun/TRTC/LiveClassroom.cs
+++ b/JianGongYun/TRTC/LiveClassroom.cs
@@ -272,10 +272,10 @@ namespace JianGongYun.TRTC
         public static void VedioRecordTask(TXLiteAVVideoView view, TRTCVideoStreamType streamType)
         {
             var end = false;
-            ConcurrentQueue<Bitmap> bitmaps = new ConcurrentQueue<Bitmap>();
+            ConcurrentQueue<Mat> bitmaps = new ConcurrentQueue<Mat>();
             view.OnRenderVideoFrameHandler += (b) =>
             {
-                bitmaps.Enqueue(b.ToBitmap());
+                bitmaps.Enqueue(b.ToMat());
             };
             view.OnViewRemove += () =>
             {
@@ -288,7 +288,6 @@ namespace JianGongYun.TRTC
                 var imgTemp = Path.Combine(_recoderDir, $"{streamType}.png");
                 var videoFile = Path.Combine(_recoderDir, $"{Util.TimeStr()}_{streamType}.avi");
                 VideoWriter vw = new VideoWriter();
-                Mat mat = default;
                 bool videoWriterInit = false;
                 while (!end || bitmaps.Count > 0)
                 {
@@ -297,26 +296,26 @@ namespace JianGongYun.TRTC
                         Thread.Sleep(100);
                         continue;
                     }
-                    if (bitmaps.TryDequeue(out var bitmap))
+                    if (bitmaps.TryDequeue(out var mat))
                     {
-                        bitmap.Save(imgTemp, System.Drawing.Imaging.ImageFormat.Png);
-                        bitmap.Dispose();
-                        mat = Cv2.ImRead(imgTemp, ImreadModes.AnyColor);
-                        Cv2.ImShow(streamType.ToString(), mat);
-                        Cv2.WaitKey(1);
+                        //mat.SaveImage(imgTemp);
+                        //mat.Dispose();
+                        //mat = Cv2.ImRead(imgTemp, ImreadModes.AnyColor);
+                        //Cv2.ImShow(streamType.ToString(), mat);
+                        //Cv2.WaitKey(1);
                         if (!videoWriterInit)
                         {
                             vw.Open(videoFile, FourCC.H264, settingWindowViewModel.EncParams.videoFps, mat.Size());
                             videoWriterInit = true;
                         }
                         vw.Write(mat);
+                        mat.Dispose();
                     }
                     else
                     {
                         Thread.Sleep(100);
                     }
                 }
-                mat?.Dispose();
                 vw?.Release();
                 vw?.Dispose();
                 if (File.Exists(imgTemp))
diff --git a/JianGongYun/TRTC/Utils/WriteableBitmapToMat.cs b/JianGongYun/TRTC/Utils/WriteableBitmapToMat.cs
index 579e8ce..81b838b 100644
--- a/JianGongYun/TRTC/Utils/WriteableBitmapToMat.cs
+++ b/JianGongYun/TRTC/Utils/WriteableBitmapToMat.cs
@@ -17,16 +17,10 @@ namespace JianGongYun.TRTC.Utils
         /// <returns></returns>
         public static Mat ToMat(this WriteableBitmap writeableBitmap)
         {
-            using (MemoryStream outStream = new MemoryStream())
+            using (var bmp = writeableBitmap.ToBitmap())
             {
-                BitmapEncoder enc = new PngBitmapEncoder();
-                enc.Frames.Add(BitmapFrame.Create(writeableBitmap));
-                enc.Save(outStream);
-                using (System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(outStream))
-                {
-                    var mat = OpenCvSharp.Extensions.BitmapConverter.ToMat(bmp);
-                    return mat;
-                }
+                var mat = OpenCvSharp.Extensions.BitmapConverter.ToMat(bmp);
+                return mat;
             }
         }
         /// <summary>
@@ -38,11 +32,23 @@ namespace JianGongYun.TRTC.Utils
         {
             using (MemoryStream outStream = new MemoryStream())
             {
-                BitmapEncoder enc = new PngBitmapEncoder();
+                //System.Windows.Media.Imaging.WmpBitmapEncoder
+                BitmapEncoder enc = new BmpBitmapEncoder();
                 enc.Frames.Add(BitmapFrame.Create(writeableBitmap));
                 enc.Save(outStream);
                 return new System.Drawing.Bitmap(outStream);
             }
         }
+
+        public static string ToFile(this WriteableBitmap writeableBitmap, string fileName)
+        {
+            using (var file = File.Create(fileName))
+            {
+                BitmapEncoder enc = new BmpBitmapEncoder();
+                enc.Frames.Add(BitmapFrame.Create(writeableBitmap));
+                enc.Save(file);
+                return fileName;
+            }
+        }
     }
 }