feat: add independent volume controls and refine audio filters

extract.py

@@ -323,7 +323,7 @@ def extract_audio_loudnorm(input_file: str, duration: int, start_sec: float,
     map_args = ["-map", f"0:a:{stream_idx}"] if stream_idx is not None else []
     base = ["ffmpeg", "-y", *ss_args, "-i", input_file, "-t", str(duration), "-vn", *map_args]
     measure_af = f"loudnorm=I={TARGET_LUFS}:TP={TARGET_TP}:LRA={TARGET_LRA}:print_format=json"
-    gate_filter = ",lowpass=f=3000,agate=threshold=0.02:ratio=20:attack=5:release=50" if loud_gate else ""
+    gate_filter = ",lowpass=f=2000,highpass=f=100,agate=threshold=0.02:ratio=20:attack=5:release=50" if loud_gate else ""
 
     # ─── Pass 1: measure ───
     print(f"[loudness] {stem}: pass 1/2 measuring…")
@@ -332,7 +332,7 @@ def extract_audio_loudnorm(input_file: str, duration: int, start_sec: float,
     if r.returncode != 0:
         print(f"[loudness] {stem}: pass 1 failed ({r.stderr.strip()[-80:]}), falling back to simple extract", file=sys.stderr)
         if loud_gate:
-            cmd_fallback = base + ["-af", "lowpass=f=3000,agate=threshold=0.02:ratio=20:attack=5:release=50", *AUDIO_CODEC, out_path]
+            cmd_fallback = base + ["-af", "lowpass=f=2000,highpass=f=100,agate=threshold=0.02:ratio=20:attack=5:release=50", *AUDIO_CODEC, out_path]
         else:
             cmd_fallback = base + [*AUDIO_CODEC, out_path]
         r2 = subprocess.run(cmd_fallback, capture_output=True, text=True)
@@ -344,7 +344,7 @@ def extract_audio_loudnorm(input_file: str, duration: int, start_sec: float,
     if measured is None:
         print(f"[loudness] {stem}: could not parse measurement, falling back to simple extract", file=sys.stderr)
         if loud_gate:
-            cmd_fallback = base + ["-af", "lowpass=f=3000,agate=threshold=0.02:ratio=20:attack=5:release=50", *AUDIO_CODEC, out_path]
+            cmd_fallback = base + ["-af", "lowpass=f=2000,highpass=f=100,agate=threshold=0.02:ratio=20:attack=5:release=50", *AUDIO_CODEC, out_path]
         else:
             cmd_fallback = base + [*AUDIO_CODEC, out_path]
         r2 = subprocess.run(cmd_fallback, capture_output=True, text=True)
@@ -495,7 +495,7 @@ for _file_idx, INPUT_FILE in enumerate(INPUT_FILES):
             cmd_audio = [
                 "ffmpeg", "-y", *ss_args, "-i", INPUT_FILE, "-t", str(DURATION),
                 "-vn", *map_args, "-af",
-                "lowpass=f=3000,agate=threshold=0.02:ratio=20:attack=5:release=50",
+                "lowpass=f=2000,highpass=f=100,agate=threshold=0.02:ratio=20:attack=5:release=50",
                 *AUDIO_CODEC, audio_out
             ]
         else:

verify_sync.py

@@ -428,16 +428,29 @@ class VerifyWindow(QtWidgets.QMainWindow):
         self.play_mode.setFixedWidth(90)
         ctrl.addWidget(self.play_mode)
 
-        ctrl.addWidget(QtWidgets.QLabel("Vol:"))
-        self.vol_slider = QtWidgets.QSlider(QtCore.Qt.Orientation.Horizontal)
-        self.vol_slider.setRange(0, 100)
-        self.vol_slider.setValue(self.default_volume)
-        self.vol_slider.setMaximumWidth(100)
-        ctrl.addWidget(self.vol_slider)
-        self.vol_label = QtWidgets.QLabel(f"{self.default_volume}%")
-        self.vol_label.setMinimumWidth(35)
-        ctrl.addWidget(self.vol_label)
-        self.vol_slider.valueChanged.connect(lambda v: self.vol_label.setText(f"{v}%"))
+        ctrl.addSpacing(10)
+
+        ctrl.addWidget(QtWidgets.QLabel("Vol A:"))
+        self.vol_a_slider = QtWidgets.QSlider(QtCore.Qt.Orientation.Horizontal)
+        self.vol_a_slider.setRange(0, 200)
+        self.vol_a_slider.setValue(self.default_volume)
+        self.vol_a_slider.setMaximumWidth(100)
+        ctrl.addWidget(self.vol_a_slider)
+        self.vol_a_label = QtWidgets.QLabel(f"{self.default_volume}%")
+        self.vol_a_label.setMinimumWidth(35)
+        ctrl.addWidget(self.vol_a_label)
+        self.vol_a_slider.valueChanged.connect(lambda v: self.vol_a_label.setText(f"{v}%"))
+
+        ctrl.addWidget(QtWidgets.QLabel("Vol B:"))
+        self.vol_b_slider = QtWidgets.QSlider(QtCore.Qt.Orientation.Horizontal)
+        self.vol_b_slider.setRange(0, 200)
+        self.vol_b_slider.setValue(self.default_volume)
+        self.vol_b_slider.setMaximumWidth(100)
+        ctrl.addWidget(self.vol_b_slider)
+        self.vol_b_label = QtWidgets.QLabel(f"{self.default_volume}%")
+        self.vol_b_label.setMinimumWidth(35)
+        ctrl.addWidget(self.vol_b_label)
+        self.vol_b_slider.valueChanged.connect(lambda v: self.vol_b_label.setText(f"{v}%"))
 
         ctrl.addSpacing(10)
 
@@ -578,16 +591,17 @@ class VerifyWindow(QtWidgets.QMainWindow):
 
         a_seg = self.a_aligned[start_samp:]
         b_seg = self.b_aligned[start_samp:]
-        vol = self.vol_slider.value() / 100.0
+        vol_a = self.vol_a_slider.value() / 100.0
+        vol_b = self.vol_b_slider.value() / 100.0
 
         mode = self.play_mode.currentIndex()
         if mode == 0:  # A+B mix
             ml = min(len(a_seg), len(b_seg))
-            mix = ((a_seg[:ml] + b_seg[:ml]) / 2.0) * vol
+            mix = (a_seg[:ml] * vol_a + b_seg[:ml] * vol_b) / 2.0
         elif mode == 1:  # A only
-            mix = a_seg * vol
+            mix = a_seg * vol_a
         else:  # B only
-            mix = b_seg * vol
+            mix = b_seg * vol_b
 
         self.audio_player.play(mix, self.sr)
         self.playing_a_b = True