diff --git a/demucs_pipeline.py b/demucs_pipeline.py
index ce72e2b..fc0f0c6 100644
--- a/demucs_pipeline.py
+++ b/demucs_pipeline.py
@@ -192,7 +192,7 @@ def run_demucs_pipeline(
     conn = [None]  # 用 list 以便在闭包中修改
 
     def accept_conn():
-        server.settimeout(120)
+        server.settimeout(30)
         try:
             c, _ = server.accept()
             conn[0] = c
@@ -206,6 +206,7 @@ def run_demucs_pipeline(
 
     accept_thread = threading.Thread(target=accept_conn, daemon=True)
     accept_thread.start()
+    time.sleep(0.2)  # 确保 server 已 listen
 
     # FFmpeg 拉流（视频）
     ffmpeg_v_cmd = [
@@ -232,14 +233,15 @@ def run_demucs_pipeline(
         "-ar", str(DEMUCS_SAMPLE_RATE), "pipe:1",
     ]
 
-    # FFmpeg 推流（视频 stdin + 音频 tcp）
+    # FFmpeg 推流：音频 tcp 放第一（FFmpeg 按顺序打开输入，pipe:0 会阻塞直到有数据，
+    # 若 pipe 在前则永远连不上 tcp，导致 accept 超时）
     vf = "fps=30,scale=720:1280:force_original_aspect_ratio=decrease:flags=lanczos,pad=720:1280:(ow-iw)/2:(oh-ih)/2:black"
     ffmpeg_out_cmd = [
         "ffmpeg", "-y", "-loglevel", "info", "-nostdin",
-        "-f", "nut", "-i", "pipe:0",
         "-f", "s16le", "-ac", str(DEMUCS_CHANNELS), "-ar", str(DEMUCS_SAMPLE_RATE),
         "-i", tcp_audio_url,
-        "-map", "0:v", "-map", "1:a",
+        "-f", "nut", "-i", "pipe:0",
+        "-map", "1:v", "-map", "0:a",
         "-vf", vf,
         "-c:v", nvenc_params.get("codec_v", "libx264"),
         "-preset", nvenc_params.get("preset_v", "fast"),