diff --git a/backend/app/services/lipsync_service.py b/backend/app/services/lipsync_service.py
index b826609..6d531ef 100644
--- a/backend/app/services/lipsync_service.py
+++ b/backend/app/services/lipsync_service.py
@@ -205,12 +205,14 @@ class LipSyncService:
             temp_output = tmpdir / "output.mp4"
             
             # 视频预处理：压缩高分辨率视频以加速处理
-            preprocessed_video = tmpdir / "preprocessed_input.mp4"
-            actual_video_path = self._preprocess_video(
-                video_path, 
-                str(preprocessed_video), 
-                target_height=720
-            )
+            # preprocessed_video = tmpdir / "preprocessed_input.mp4"
+            # actual_video_path = self._preprocess_video(
+            #     video_path, 
+            #     str(preprocessed_video), 
+            #     target_height=720
+            # )
+            # 暂时禁用预处理以保持原始分辨率
+            actual_video_path = video_path
             
             # 构建命令
             cmd = [