🐛 fix(av1-transfer): catch FileNotFoundError in get_duration when ffprobe is missing

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

av1-transfer/main.py

@@ -75,6 +75,7 @@ def _set_proc_title(title: str) -> None:
 
 def get_duration(input_path):
     """用 ffprobe 获取视频时长（秒），失败返回 None"""
+    try:
         result = subprocess.run(
             [
                 "ffprobe", "-v", "error",
@@ -85,9 +86,8 @@ def get_duration(input_path):
             capture_output=True,
             text=True,
         )
-    try:
         return float(result.stdout.strip())
-    except (ValueError, AttributeError):
+    except Exception:
         return None