Fix double stop in ANSVideoPlayer

modules/ANSLPR/ANSLPR_OCR.cpp

@@ -6,6 +6,7 @@
 
 #include <json.hpp>
 #include <algorithm>
+#include <atomic>
 #include <chrono>
 
 // ---------------------------------------------------------------------------
@@ -1063,6 +1064,34 @@ namespace ANSCENTER
 		std::lock_guard<std::mutex> plateLock(_plateIdentitiesMutex);
 		auto& identities = _plateIdentities[cameraId];
 
+		// Leak diagnostic — [OCR_Leak] heartbeat, at most once per 60 s
+		// process-wide. Same fields as the ANSALPR_OD variant for direct
+		// comparison: cams, ids_tot, clr, imgtrk. If any of these climb
+		// monotonically, the corresponding state container is the leak.
+		{
+			using clk = std::chrono::steady_clock;
+			static std::atomic<long long> s_nextLog{0};
+			const long long tick = clk::now().time_since_epoch().count();
+			long long expected = s_nextLog.load(std::memory_order_relaxed);
+			if (tick >= expected) {
+				const long long deadline = tick +
+					std::chrono::duration_cast<clk::duration>(
+						std::chrono::seconds(60)).count();
+				if (s_nextLog.compare_exchange_strong(expected, deadline,
+				                                       std::memory_order_relaxed)) {
+					size_t ids_tot = 0;
+					for (const auto& [cam, v] : _plateIdentities) ids_tot += v.size();
+					ANS_DBG("OCR_Leak",
+						"ANSALPR_OCR this=%p cams=%zu ids_tot=%zu clr=%zu imgtrk=%zu",
+						(void*)this,
+						_plateIdentities.size(),
+						ids_tot,
+						_colourCache.size(),
+						_imageSizeTrackers.size());
+				}
+			}
+		}
+
 		// Auto-detect mode by detection count.
 		//   1 detection  → pipeline/single-crop mode → no dedup needed.
 		//   2+ detections → full-frame mode → apply accumulated scoring.