fix: apply_sync ffmpeg streamcpy and filter

sync_audio_test.py

@@ -111,7 +111,8 @@ def find_wavs_from_config(cfg: dict) -> tuple[str, str, int, float, float, int]:
 
 class SyncWindow(QtWidgets.QMainWindow):
     def __init__(self, a_path: str, b_path: str, sr: int = 48000, method: str = "phat", device: str = "auto",
-                 video_a: str = "", video_b: str = "", out_dir: str = "output", volume: int = 30):
+                 video_a: str = "", video_b: str = "", out_dir: str = "output", volume: int = 30,
+                 duration: float = 90.0):
         super().__init__()
         self.setWindowTitle(f"movie_sync — audio sync test — {device_info()}")
         self.resize(1400, 900)
@@ -121,6 +122,7 @@ class SyncWindow(QtWidgets.QMainWindow):
         self.video_b = video_b
         self.out_dir = out_dir
         self.sr = sr
+        self.duration = duration
         self.method = method
         self.device_pref = device
         self._updating = False
@@ -193,6 +195,10 @@ class SyncWindow(QtWidgets.QMainWindow):
         self.p3.addItem(self.peak_line)
         self.p3.setXRange(self.lag_sec-2, self.lag_sec+2)
 
+        self.xcorr_val_label = QtWidgets.QLabel()
+        self.xcorr_val_label.setStyleSheet("color: #ffd166; font-size: 12px;")
+        lay.addWidget(self.xcorr_val_label)
+
         # controls
         ctr = QtWidgets.QHBoxLayout()
         lay.addLayout(ctr)
@@ -232,7 +238,7 @@ class SyncWindow(QtWidgets.QMainWindow):
         btn_export = QtWidgets.QPushButton("Export data")
         ctr.addWidget(btn_export)
 
-        btn_verify = QtWidgets.QPushButton("Verify (30s)")
+        btn_verify = QtWidgets.QPushButton(f"Verify ({duration:g}s)")
         ctr.addWidget(btn_verify)
 
         btn_apply = QtWidgets.QPushButton("Apply sync")
@@ -294,6 +300,7 @@ class SyncWindow(QtWidgets.QMainWindow):
         self.btn_stop.clicked.connect(self.stop_play)
 
         self.update_labels()
+        self._update_xcorr_label()
 
     def _set_lag(self, lag_sec: float, source: str = ""):
         if self._updating:
@@ -314,9 +321,23 @@ class SyncWindow(QtWidgets.QMainWindow):
         # pyqtgraph setPos shifts items; we recreate x
         # Instead shift data: plot t_b + lag
         self.curve_b.setData(self.t_b + shift, self.b_plot)
+        self._update_xcorr_label()
         self.update_labels()
         self._updating = False
 
+    def _update_xcorr_label(self):
+        N = len(self.corr)
+        idx = N // 2 + self.lag_samples
+        if 0 <= idx < N:
+            val = np.abs(self.corr[idx])
+            peak_val = np.abs(self.peak)
+            pct = (val / peak_val * 100) if peak_val > 0 else 0
+            self.xcorr_val_label.setText(
+                f"Xcorr at lag: {val:.6f}  (peak: {peak_val:.6f}  = {pct:.1f}%)"
+            )
+        else:
+            self.xcorr_val_label.setText("Xcorr at lag: (out of range)")
+
     def update_labels(self):
         lag_ms = self.lag_sec * 1000
         stem = os.path.splitext(os.path.basename(self.video_a))[0]
@@ -498,7 +519,7 @@ def main():
     args = ap.parse_args()
 
     cfg = load_config(args.config)
-    cfg_a, cfg_b, sr, _, _, volume = find_wavs_from_config(cfg)
+    cfg_a, cfg_b, sr, _, duration, volume = find_wavs_from_config(cfg)
     a_path = args.a or cfg_a
     b_path = args.b or cfg_b
     method = args.method or cfg.get("sync", {}).get("method", "phat")
@@ -546,7 +567,8 @@ def main():
     app.setPalette(dark)
     pg.setConfigOptions(antialias=True, background="#1e1e1e", foreground="#ddd")
     w = SyncWindow(a_path, b_path, sr=sr, method=method, device=device,
-                   video_a=video_a, video_b=video_b, out_dir=out_dir, volume=volume)
+                   video_a=video_a, video_b=video_b, out_dir=out_dir, volume=volume,
+                   duration=duration)
     w.show()
     sys.exit(app.exec())