one behind duplicated, and the correct

cht/stream/manager.py

@@ -263,6 +263,7 @@ class StreamManager:
         def _read_stdout():
             frame_num = start_number
             offset = self.current_global_offset
+            last_pts = -1.0
             buf = b""
             raw_fd = proc.stdout.fileno()
             while True:
@@ -288,6 +289,12 @@ class StreamManager:
                         log.warning("No timestamp for scene frame %d", frame_num)
                         pts_time = 0.0
 
+                    # Skip flush frames (within 100ms of previous = duplicate)
+                    if pts_time - last_pts < 0.1:
+                        log.debug("Skipping flush frame at pts=%.3f", pts_time)
+                        continue
+                    last_pts = pts_time
+
                     frame_id = f"F{frame_num:04d}"
                     frame_path = self.frames_dir / f"{frame_id}.jpg"
                     frame_path.write_bytes(jpeg_data)