From 27b7ef0a7aad6b224f37fdfe2e293d2922e41bbf Mon Sep 17 00:00:00 2001
From: ryzendigo <48058157+ryzendigo@users.noreply.github.com>
Date: Fri, 1 May 2026 02:16:49 +0800
Subject: [PATCH] fix: mismatched time sources break birdseye idle heartbeat
 (#22466)

The idle heartbeat check in BirdsEyeOutputProcess.update() compares
time.monotonic() (seconds since an arbitrary point, typically boot)
against last_output_time which is set from datetime.datetime.now().timestamp()
(Unix epoch seconds).

These are completely different time bases. The subtraction produces a
large negative number, so the idle heartbeat condition can never be
satisfied. This means birdseye stops sending frames when all cameras
go idle, instead of continuing at the configured idle_heartbeat_fps.

Use datetime.datetime.now().timestamp() consistently for both the
heartbeat check and the output time tracking.
---
 frigate/output/birdseye.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/frigate/output/birdseye.py b/frigate/output/birdseye.py
index ff846008c..98b4dec75 100644
--- a/frigate/output/birdseye.py
+++ b/frigate/output/birdseye.py
@@ -882,7 +882,7 @@ class Birdseye:
                 coordinates = self.birdseye_manager.get_camera_coordinates()
                 self.requestor.send_data(UPDATE_BIRDSEYE_LAYOUT, coordinates)
         if self._idle_interval:
-            now = time.monotonic()
+            now = datetime.datetime.now().timestamp()
             is_idle = len(self.birdseye_manager.camera_layout) == 0
             if (
                 is_idle