From 3e90f3032c7765410ce6cbe6440576872bba983b Mon Sep 17 00:00:00 2001
From: Blake Blackshear <blakeb@blakeshome.com>
Date: Tue, 8 Feb 2022 07:40:45 -0600
Subject: [PATCH] make stationary_threshold configurable

---
 docs/docs/configuration/index.md | 4 +++-
 frigate/config.py                | 5 +++++
 frigate/objects.py               | 6 +++---
 frigate/video.py                 | 4 ++--
 4 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/docs/docs/configuration/index.md b/docs/docs/configuration/index.md
index 2bf28024b..49164b44c 100644
--- a/docs/docs/configuration/index.md
+++ b/docs/docs/configuration/index.md
@@ -159,9 +159,11 @@ detect:
   enabled: True
   # Optional: Number of frames without a detection before frigate considers an object to be gone. (default: 5x the frame rate)
   max_disappeared: 25
-  # Optional: Frequency for running detection on stationary objects (default: 0)
+  # Optional: Frequency for running detection on stationary objects (default: shown below)
   # When set to 0, object detection will never be run on stationary objects. If set to 10, it will be run on every 10th frame.
   stationary_interval: 0
+  # Optional: Number of frames without a position change for an object to be considered stationary (default: shown below)
+  stationary_threshold: 10
 
 # Optional: Object configuration
 # NOTE: Can be overridden at the camera level
diff --git a/frigate/config.py b/frigate/config.py
index 50da2c561..f7f82e91d 100644
--- a/frigate/config.py
+++ b/frigate/config.py
@@ -177,6 +177,11 @@ class DetectConfig(FrigateBaseModel):
         title="Frame interval for checking stationary objects.",
         ge=0,
     )
+    stationary_threshold: Optional[int] = Field(
+        default=10,
+        title="Number of frames without a position change for an object to be considered stationary",
+        ge=1,
+    )
 
 
 class FilterConfig(FrigateBaseModel):
diff --git a/frigate/objects.py b/frigate/objects.py
index 3a5ae1171..640130043 100644
--- a/frigate/objects.py
+++ b/frigate/objects.py
@@ -48,7 +48,7 @@ class ObjectTracker:
         del self.tracked_objects[id]
         del self.disappeared[id]
 
-    # tracks the current position of the object based on the last 10 bounding boxes
+    # tracks the current position of the object based on the last N bounding boxes
     # returns False if the object has moved outside its previous position
     def update_position(self, id, box):
         position = self.positions[id]
@@ -78,9 +78,9 @@ class ObjectTracker:
             }
             return False
 
-        # if there are less than 10 entries for the position, add the bounding box
+        # if there are less than stationary_threshold entries for the position, add the bounding box
         # and recompute the position box
-        if len(position["xmins"]) < 10:
+        if len(position["xmins"]) < self.detect_config.stationary_threshold:
             position["xmins"].append(xmin)
             position["ymins"].append(ymin)
             position["xmaxs"].append(xmax)
diff --git a/frigate/video.py b/frigate/video.py
index cb201fd22..2d419cc1d 100755
--- a/frigate/video.py
+++ b/frigate/video.py
@@ -507,8 +507,8 @@ def process_frames(
             stationary_object_ids = [
                 obj["id"]
                 for obj in object_tracker.tracked_objects.values()
-                # if there hasn't been motion for 10 frames
-                if obj["motionless_count"] >= 10
+                # if there hasn't been motion for N frames
+                if obj["motionless_count"] >= detect_config.stationary_threshold
                 # and it isn't due for a periodic check
                 and (
                     detect_config.stationary_interval == 0