diff --git a/apps/worker/video_processing/render_adapter.py b/apps/worker/video_processing/render_adapter.py
index ef72ae72d..a18ffddf1 100755
--- a/apps/worker/video_processing/render_adapter.py
+++ b/apps/worker/video_processing/render_adapter.py
@@ -567,13 +567,15 @@ class RenderAdapter:
         try:
             from video_processing.thumbnail_generator import extract_first_frame
 
-            cover_frame_path = extract_first_frame(str(result.output_path))
+            cover_frame_path = extract_first_frame(str(result.output_path), width=640)
             cover_storage_key = f"rendered/{plan_id}/cover.jpg"
-            cover_url = upload_to_oss(cover_frame_path, cover_storage_key) or ""
             try:
-                Path(cover_frame_path).unlink(missing_ok=True)
-            except Exception:
-                pass
+                cover_url = upload_to_oss(cover_frame_path, cover_storage_key) or ""
+            finally:
+                try:
+                    Path(cover_frame_path).unlink(missing_ok=True)
+                except Exception:
+                    pass
             if cover_url:
                 logger.info(
                     "[render-adapter] 封面帧提取成功: plan_id=%s url=%s",