diff --git a/deploy/gpu_worker/gpu_worker.py b/deploy/gpu_worker/gpu_worker.py
index 72bb73aed..a3ace3b11 100644
--- a/deploy/gpu_worker/gpu_worker.py
+++ b/deploy/gpu_worker/gpu_worker.py
@@ -22,7 +22,6 @@
 
 from __future__ import annotations
 
-import json
 import logging
 import os
 import platform
@@ -200,9 +199,7 @@ def _download(url: str, path: Path) -> bool:
         return False
 
 
-def _call_musetalk(
-    video_path: Path, audio_path: Path, out_path: Path
-) -> tuple[bool, float, str, bool]:
+def _call_musetalk(video_path: Path, audio_path: Path, out_path: Path) -> tuple[bool, float, str, bool]:
     """调用本地 MuseTalk /inference.
 
     返回 (success, duration_seconds, error_msg, retryable)。
@@ -245,9 +242,13 @@ def _probe_duration(path: Path) -> float:
 
         out = subprocess.check_output(
             [
-                "ffprobe", "-v", "error",
-                "-show_entries", "format=duration",
-                "-of", "default=noprint_wrappers=1:nokey=1",
+                "ffprobe",
+                "-v",
+                "error",
+                "-show_entries",
+                "format=duration",
+                "-of",
+                "default=noprint_wrappers=1:nokey=1",
                 str(path),
             ],
             stderr=subprocess.DEVNULL,