ffmpeg fix

cht/window.py

@@ -28,6 +28,7 @@ from cht.ui.session_dialog import SessionDialog
 from cht.session import load_frame_index, load_segment_manifest, rebuild_manifest, global_time_to_segment
 from cht.scrub.manager import ProxyManager
 from cht.agent.runner import AgentRunner, check_claude_cli
+from cht.telemetry import Telemetry
 
 log = logging.getLogger(__name__)
 
@@ -42,6 +43,7 @@ class ChtWindow(Adw.ApplicationWindow):
         self._manifest = []
         self._pending_scrub_global = 0.0
         self._scrub_pending = False  # throttle flag for scrub updates
+        self._telemetry = None
 
         # Core components
         self._timeline = Timeline()
@@ -158,11 +160,17 @@ class ChtWindow(Adw.ApplicationWindow):
 
     def _on_scene_threshold(self, val):
         if self._lifecycle.stream_mgr:
+            old = self._lifecycle.stream_mgr.scene_threshold
             self._lifecycle.stream_mgr.scene_threshold = val
+            if self._telemetry:
+                self._telemetry.event("scene_threshold_changed", {"from": old, "to": val})
 
     def _on_min_chunk_changed(self, panel, val):
         import cht.config
+        old = cht.config.TRANSCRIBE_MIN_CHUNK_S
         cht.config.TRANSCRIBE_MIN_CHUNK_S = val
+        if self._telemetry:
+            self._telemetry.event("min_chunk_changed", {"from": old, "to": val})
 
     def _on_lines_per_group_changed(self, panel, val):
         import cht.config
@@ -268,6 +276,8 @@ class ChtWindow(Adw.ApplicationWindow):
         self._connect_btn.add_css_class("destructive-action")
 
         mgr = self._lifecycle.start(session_id=session_id)
+        self._telemetry = Telemetry(mgr.session_dir)
+        mgr.telemetry = self._telemetry
 
         self._monitor.set_recording(mgr.recording_path)
         self._monitor.set_live_source(mgr.relay_url)
@@ -285,12 +295,13 @@ class ChtWindow(Adw.ApplicationWindow):
 
     def _on_live_toggle(self):
         if self._timeline.state.live:
-            # Live → Scrub: don't load growing MKV, let user pick a segment
+            if self._telemetry:
+                self._telemetry.event("mode_switch", {"from": "live", "to": "scrub"})
             self._timeline.toggle_live(live_player_pos=self._monitor.get_live_position())
-            # Refresh manifest so scrub bar shows completed segments
             self._update_scrub_bar_manifest()
         else:
-            # Scrub → Live: restore recording path, refresh GUI, resume
+            if self._telemetry:
+                self._telemetry.event("mode_switch", {"from": "scrub", "to": "live"})
             mgr = self._lifecycle.stream_mgr
             if mgr:
                 self._monitor.set_recording(mgr.recording_path)
@@ -442,6 +453,10 @@ class ChtWindow(Adw.ApplicationWindow):
         mgr = self._lifecycle.stream_mgr
         last_session_id = mgr.session_id if mgr and not mgr.readonly else None
 
+        if self._telemetry:
+            self._telemetry.close()
+            self._telemetry = None
+
         self._lifecycle.stop()
 
         if self._proxy_mgr: