diff --git a/SpineViewer/ExportHelper/ExportHelper.cs b/SpineViewer/ExportHelper/ExportHelper.cs
new file mode 100644
index 0000000..10beedc
--- /dev/null
+++ b/SpineViewer/ExportHelper/ExportHelper.cs
@@ -0,0 +1,42 @@
+using FFMpegCore.Pipes;
+using System;
+using System.Collections.Generic;
+using System.Drawing.Imaging;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SpineViewer.ExportHelper
+{
+    /// <summary>
+    /// 为帧导出创建的辅助类
+    /// </summary>
+    public static class ExportHelper
+    {
+        /// <summary>
+        /// 从纹理对象获取 Winforms Bitmap 对象
+        /// </summary>
+        public static Bitmap CopyToBitmap(this SFML.Graphics.Texture tex)
+        {
+            using var img = tex.CopyToImage();
+            img.SaveToMemory(out var imgBuffer, "bmp");
+            using var stream = new MemoryStream(imgBuffer);
+            return new Bitmap(stream);
+        }
+
+        /// <summary>
+        /// 从纹理获取适合 FFMpegCore 的帧对象
+        /// </summary>
+        public static SFMLImageVideoFrame CopyToFrame(this SFML.Graphics.Texture tex) => new(tex.CopyToImage());
+
+        /// <summary>
+        /// 根据文件格式获取合适的文件后缀
+        /// </summary>
+        public static string GetSuffix(this ImageFormat imageFormat)
+        {
+            if (imageFormat == ImageFormat.Icon) return ".ico";
+            else if (imageFormat == ImageFormat.Exif) return ".jpg";
+            else return $".{imageFormat.ToString().ToLower()}";
+        }
+    }
+}
diff --git a/SpineViewer/ExportHelper.cs b/SpineViewer/ExportHelper/SFMLImageVideoFrame.cs
similarity index 61%
rename from SpineViewer/ExportHelper.cs
rename to SpineViewer/ExportHelper/SFMLImageVideoFrame.cs
index ea517b9..d71c3c8 100644
--- a/SpineViewer/ExportHelper.cs
+++ b/SpineViewer/ExportHelper/SFMLImageVideoFrame.cs
@@ -1,13 +1,11 @@
-using FFMpegCore.Pipes;
-using System;
+using System;
 using System.Collections.Generic;
-using System.Drawing.Imaging;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
-using static System.Windows.Forms.VisualStyles.VisualStyleElement.StartPanel;
+using FFMpegCore.Pipes;
 
-namespace SpineViewer
+namespace SpineViewer.ExportHelper
 {
     /// <summary>
     /// SFML.Graphics.Image 帧对象包装类
@@ -38,27 +36,4 @@ namespace SpineViewer
         /// <returns>True if saving was successful</returns>
         public bool SaveToMemory(out byte[] output, string format) => image.SaveToMemory(out output, format);
     }
-
-    /// <summary>
-    /// 为帧导出创建的辅助类
-    /// </summary>
-    public static class ExportHelper
-    {
-        public static Bitmap CopyToBitmap(this SFML.Graphics.Texture tex)
-        {
-            using var img = tex.CopyToImage();
-            img.SaveToMemory(out var imgBuffer, "bmp");
-            using var stream = new MemoryStream(imgBuffer);
-            return new Bitmap(stream);
-        }
-
-        public static SFMLImageVideoFrame CopyToFrame(this SFML.Graphics.Texture tex) => new(tex.CopyToImage());
-
-        public static string GetSuffix(this ImageFormat imageFormat)
-        {
-            if (imageFormat == ImageFormat.Icon) return ".ico";
-            else if (imageFormat == ImageFormat.Exif) return ".jpg";
-            else return $".{imageFormat.ToString().ToLower()}";
-        }
-    }
 }