diff --git a/apps/api/app/schemas/ai_avatar_render.py b/apps/api/app/schemas/ai_avatar_render.py
index 338e65264..84761c2f4 100644
--- a/apps/api/app/schemas/ai_avatar_render.py
+++ b/apps/api/app/schemas/ai_avatar_render.py
@@ -114,7 +114,9 @@ class SmartCoverRequest(BaseModel):
 
     video_url: str = Field(..., description="数字人视频 URL（对口型/渲染成片）")
     max_frames: int = Field(5, ge=1, le=10, description="抽帧数量（默认 5）")
-    title_config: Optional[dict[str, Any]] = Field(None, description="标题配置；传入时在封面上用 drawtext 叠加标题（竖屏 720x1280）")
+    title_config: Optional[dict[str, Any]] = Field(
+        None, description="标题配置；传入时在封面上用 drawtext 叠加标题（竖屏 720x1280）"
+    )
 
 
 class SmartCoverResponse(BaseModel):
diff --git a/apps/api/app/services/ai_avatar_cover_service.py b/apps/api/app/services/ai_avatar_cover_service.py
index a21545544..b109cd079 100644
--- a/apps/api/app/services/ai_avatar_cover_service.py
+++ b/apps/api/app/services/ai_avatar_cover_service.py
@@ -187,9 +187,12 @@ def apply_title_to_cover(local_frame: str, *, title_config: dict | None) -> str:
         titled_path = f"{base}_titled{ext or '.jpg'}"
         cmd = [
             "ffmpeg",
-            "-i", local_frame,
-            "-vf", drawtext_filter,
-            "-y", titled_path,
+            "-i",
+            local_frame,
+            "-vf",
+            drawtext_filter,
+            "-y",
+            titled_path,
         ]
         logger.info("[数字人封面] 叠加标题: text=%s", text[:30])
         result = subprocess.run(
diff --git a/apps/api/app/services/ai_avatar_render_service.py b/apps/api/app/services/ai_avatar_render_service.py
index 0a5738e9d..92952663c 100644
--- a/apps/api/app/services/ai_avatar_render_service.py
+++ b/apps/api/app/services/ai_avatar_render_service.py
@@ -449,13 +449,18 @@ class AiAvatarRenderService:
         elif filter_complex:
             cmd.extend(["-filter_complex", filter_complex])
 
-        cmd.extend([
-            "-c:v", "libx264",
-            "-preset", "veryfast",
-            "-crf", "23",
-            "-y",
-            output_path,
-        ])
+        cmd.extend(
+            [
+                "-c:v",
+                "libx264",
+                "-preset",
+                "veryfast",
+                "-crf",
+                "23",
+                "-y",
+                output_path,
+            ]
+        )
         return cmd
 
     def _build_cover_extract_cmd(
@@ -477,9 +482,12 @@ class AiAvatarRenderService:
 
         cmd: list[str] = [
             "ffmpeg",
-            "-ss", str(timestamp),
-            "-i", input_video,
-            "-frames:v", "1",
+            "-ss",
+            str(timestamp),
+            "-i",
+            input_video,
+            "-frames:v",
+            "1",
         ]
         if width > 0 and height > 0:
             vf = (