fix: mpv in verify_sync

sync_audio_test.py

@@ -413,7 +413,10 @@ class SyncWindow(QtWidgets.QMainWindow):
         cmd = [sys.executable, script, "--config", "config.toml",
                "--lag", f"{self.lag_sec:.6f}", "--mode", "short"]
         print(f"Launching: {' '.join(cmd)}")
-        subprocess.Popen(cmd, cwd=os.path.dirname(os.path.abspath(__file__)))
+        env = os.environ.copy()
+        env["LC_NUMERIC"] = "C"
+        env["QT_QPA_PLATFORM"] = "xcb"
+        subprocess.Popen(cmd, cwd=os.path.dirname(os.path.abspath(__file__)), env=env)
 
     def on_apply_sync(self):
         """Run apply_sync.py on full files, then launch verify_sync.py in full mode."""
@@ -435,7 +438,10 @@ class SyncWindow(QtWidgets.QMainWindow):
         cmd2 = [sys.executable, verify_script, "--config", "config.toml",
                 "--lag", f"{self.lag_sec:.6f}", "--mode", "full"]
         print(f"Launching: {' '.join(cmd2)}")
-        subprocess.Popen(cmd2, cwd=script_dir)
+        env2 = os.environ.copy()
+        env2["LC_NUMERIC"] = "C"
+        env2["QT_QPA_PLATFORM"] = "xcb"
+        subprocess.Popen(cmd2, cwd=script_dir, env=env2)
 
     def play(self, which: str):
         if not HAS_SD:

verify_sync.py

@@ -22,7 +22,11 @@ Usage:
 """
 
 from __future__ import annotations
-import os, sys, math, argparse, subprocess, json, shutil, threading, tempfile, warnings, signal
+import os, sys, math, argparse, subprocess, json, shutil, threading, tempfile, warnings, signal, locale
+
+os.environ["LC_NUMERIC"] = "C"
+locale.setlocale(locale.LC_NUMERIC, "C")
+
 import numpy as np
 
 warnings.filterwarnings("ignore", category=RuntimeWarning, module="pyqtgraph")