From b72bfd0fd0475cd6fe9c3753df83d765418f04e1 Mon Sep 17 00:00:00 2001
From: Nikolas Dahn <41790746+ndahn@users.noreply.github.com>
Date: Wed, 22 Apr 2026 23:41:31 +0200
Subject: [PATCH] Fix stderr handling for frozen Windows applications

Prevent stderr duplication issues in frozen context on Windows. Fixes #461.
---
 src/sounddevice.py | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/src/sounddevice.py b/src/sounddevice.py
index 00fc6f8..97bbe2a 100644
--- a/src/sounddevice.py
+++ b/src/sounddevice.py
@@ -2925,13 +2925,17 @@ def _initialize():
 
     """
     old_stderr = None
-    try:
-        old_stderr = _os.dup(2)
-        devnull = _os.open(_os.devnull, _os.O_WRONLY)
-        _os.dup2(devnull, 2)
-        _os.close(devnull)
-    except OSError:
-        pass
+    # Duping std file descriptors in a frozen context on windows will corrupt
+    # the fd and cause issues with e.g. subprocess.check_output. This happens
+    # for example in a compiled pyinstaller exe. See #461 for details.
+    if _sys.platform != 'win32' or not getattr(_sys, 'frozen', False):
+        try:
+            old_stderr = _os.dup(2)
+            devnull = _os.open(_os.devnull, _os.O_WRONLY)
+            _os.dup2(devnull, 2)
+            _os.close(devnull)
+        except OSError:
+            pass
     try:
         _check(_lib.Pa_Initialize(), 'Error initializing PortAudio')
         global _initialized