Update api.py

api.py

@@ -111,7 +111,7 @@ async def execute_all_task(background_tasks: BackgroundTasks,file_list: list = [
     if allow_submit:
         #如果请求中设置允许上传output.mp4
         cover_img = cover_image.file.read()
-        cover_img_data = Image.open(io.BytesIO(img)).convert("L").convert("RGB")
+        cover_img_data = Image.open(io.BytesIO(cover_image)).convert("L").convert("RGB")
         cover_path_to_image = os.path.join(cover_path, f"cover.jpg")
         cover_img_data.save(cover_path_to_image)
         #video数据从meta用户请求获取,至于