接口做兼容处理，避免直接报错。

src/service/add_captions.py

@@ -1,3 +1,16 @@
+# Copyright 2024 Hommy <taohongmin@sina.cn>.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 import json
 from typing import List, Dict, Any, Tuple, Optional, Literal
 import asyncio
@@ -818,6 +831,16 @@ def parse_captions_data(json_str: str) -> List[Dict[str, Any]]:
         if not isinstance(processed_item["end"], (int, float)) or processed_item["end"] <= processed_item["start"]:
             logger.error(f"the {i}th item has invalid end time: {processed_item['end']}")
             raise CustomException(CustomError.INVALID_CAPTION_INFO, f"the {i}th item has invalid end time")
+
+        # 将时间转换为整数（微秒），兼容 start/end 为小数的情况
+        processed_item["start"] = int(processed_item["start"])
+        processed_item["end"] = int(processed_item["end"])
+        if processed_item["end"] <= processed_item["start"]:
+            logger.error(
+                f"the {i}th item has invalid end time after int conversion: "
+                f"start={processed_item['start']}, end={processed_item['end']}"
+            )
+            raise CustomException(CustomError.INVALID_CAPTION_INFO, f"the {i}th item has invalid end time")
         
         if not isinstance(processed_item["text"], str) or len(processed_item["text"].strip()) == 0:
             logger.error(f"the {i}th item has invalid text: {processed_item['text']}")