diff --git a/av1-transfer/main.py b/av1-transfer/main.py
index c7ba88b..6c021e2 100644
--- a/av1-transfer/main.py
+++ b/av1-transfer/main.py
@@ -21,6 +21,7 @@ import ctypes
 import ctypes.util
 import queue
 import shlex
+import shutil
 import subprocess
 import sys
 from concurrent.futures import ThreadPoolExecutor, as_completed
@@ -133,9 +134,11 @@ def transcode_one_file(file_info, overall_bar, slot_bars, slot_queue, process_na
             # 用 bash 的 exec -a 重命名 ffmpeg 进程的 argv[0]
             # ffmpeg 通过 PATH 查找，避免 execve 直接调用 symlink 的兼容问题
             shell_args = " ".join(shlex.quote(str(a)) for a in ffmpeg_args)
+            sh = shutil.which("sh") or shutil.which("bash") or "/usr/bin/sh"
             proc = subprocess.Popen(
                 f"exec -a {shlex.quote(process_name)} ffmpeg {shell_args}",
                 shell=True,
+                executable=sh,
                 stdout=subprocess.PIPE,
                 stderr=subprocess.PIPE,
             )