[Support]: Some events 'disappear' #19135

chrish987 · 2025-07-14T00:01:45Z

chrish987
Jul 14, 2025

Checklist

I have updated to the latest available Frigate version.
I have cleared the cache of my browser.
I have tried a different browser to see if it is related to my browser.
I have tried reproducing the issue in incognito mode to rule out problems with any third party extensions or plugins I have installed.

Describe the problem you are having

Not going to be an easy one to troubleshoot - but I thought I would raise an issue, see if it known behaviour.

I have written a node-red flow that listens to the frigate events. It subscribes to the MQTT event messages, and then sends some notifications based on some rules. It listens to each MQTT message for an event, through the new, update, end events. At each event it logs to a database, and also grabs a snapshot (and thumbnail) from the HTTP API. For the new event data is taken from the before section of the message, for each update and end data is taken from the after section. All of this is logged to a database, and snapshots are saved externally to frigate.

Sometimes (maybe 5% of events), once the end update is reached the snapshot is not available. I know that the object that was detected is actually there - as I can see it in the early JPGs. The flow will try and grab a snapshot within a few milliseconds of the MQTT message. Interestingly if I query the snapshot URL through a browser some time later then the entire event id seems to have gone.

Steps to reproduce

I can't reproduce this at will.

Version

0.16.0 latest

In which browser(s) are you experiencing the issue with?

not a browser issue i think

Frigate config file

mqtt:
  enabled: true
  host: 172.21.64.126
  port: 1883
  topic_prefix: frigate
  client_id: frigate
  stats_interval: 60

detectors:
#  tensorrt:
#    type: tensorrt
#    device: 0
  onnx:
    type: onnx

model:
#  path: plus://xx#320x320
  path: plus://xx#640x640
#  path: /config/model_cache/tensorrt/yolov7-320.trt
#  input_tensor: nchw
#  input_pixel_format: rgb
#  width: 320
#  height: 320

logger:
  default: info
  logs:
    frigate.app: info
    frigate.event: info
    detector.tensorrt: info

birdseye:
  enabled: false

#face_recognition:
#  enabled: true

ffmpeg:
  hwaccel_args: preset-nvidia-h264

motion:
  threshold: 20 # 1 - 255 (higher = less sensative to motion)
  contour_area: 10
  lightning_threshold: 0.8
  improve_contrast: true

record:
  enabled: true
  alerts:
    retain:
      days: 2
    pre_capture: 10
    post_capture: 20
  detections:
    retain:
      days: 2
    pre_capture: 10
    post_capture: 20
snapshots:
  enabled: true
  timestamp: true
  bounding_box: true
  retain:
    default: 2

go2rtc:
  streams:
    backdeck:
      - rtsp://root:xx@cam-backdeck.xx.com:554/axis-media/media.amp?videocodec=h264&resolution=1920x1080&fps=25
    cardeck:
      - rtsp://root:xx@cam-cardeck.xx.com:554/axis-media/media.amp?videocodec=h264&resolution=2688x1520&fps=25
    frontdeck:
      - rtsp://root:xx@cam-frontdeck.xx.com:554/axis-media/media.amp?videocodec=h264&resolution=1920x1080&fps=50
    kitchendeck:
      - rtsp://root:xx@cam-kitchendeck.xx.com:554/axis-media/media.amp?videocodec=h264&resolution=1920x1080&fps=25
    officedeck:
      - rtsp://root:xx@cam-officedeck.xx.com:554/axis-media/media.amp?videocodec=h264&resolution=1920x1080&fps=25
    sidedeck:
      - rtsp://root:xx@cam-sidedeck.xx.com:554/axis-media/media.amp?videocodec=h264&resolution=1920x1080&fps=25
    sideentrance:
      - rtsp://root:xx@cam-sideentrance.xx.com:554/axis-media/media.amp?videocodec=h264&resolution=1920x1080&fps=25
    office2:
      - rtsp://root:xx@cam-office2.xx.com:554/axis-media/media.amp?videocodec=h264&resolution=1920x1080&fps=25
#    test:
#      - rtsp://root:xx@172.21.96.129:554/axis-media/media.amp?videocodec=h264&resolution=1920x1080&fps=25
  webrtc:
    candidates:
      - 172.21.64.125:8555

timestamp_style:
  position: tl
  format: '%d/%m/%Y %H:%M:%S'

cameras:
  cardeck:
    enabled: true
    ffmpeg:
      inputs:
        - path: rtsp://frigate:8554/cardeck
          input_args: preset-rtsp-restream
          roles:
            - detect
    detect:
      enabled: true
      width: 2688
      height: 1520
      fps: 5
    objects:
      track:
        - person
        - cat
      filters:
        person:
          min_area: 5000
          min_score: 0.7
          threshold: 0.75
      mask: 
        1,0.424,1,1,0.634,1,0.607,0.903,0.587,0.783,0.584,0.715,0.591,0.659,0.608,0.603,0.631,0.531,0.718,0.453,0.812,0.368,0.857,0.373
    review:
      alerts:
        labels:
          - person
          - cat
    motion: {}
    mqtt:
      enabled: false
    ui:
      order: 0
      dashboard: true

  frontdeck:
    enabled: true
    ffmpeg:
      inputs:
        - path: rtsp://frigate:8554/frontdeck
          input_args: preset-rtsp-restream
          roles:
            - detect
    detect:
      enabled: true
      width: 1920
      height: 1080
      fps: 5
    objects:
      track:
        - person
        - cat
      filters:
        person:
          min_area: 5000
        cat:
          mask: 0.258,0.803,0.313,0.764,0.295,0.676,0.239,0.719
    review:
      alerts:
        labels:
          - person
          - cat
    zones: {}
    mqtt:
      enabled: false
    ui:
      order: 1
      dashboard: true

  sidedeck:
    enabled: true
    ffmpeg:
      inputs:
        - path: rtsp://frigate:8554/sidedeck
          input_args: preset-rtsp-restream
          roles:
            - detect
    detect:
      enabled: true
      width: 1920
      height: 1080
      fps: 5
    objects:
      track:
        - person
        - cat
      filters:
        person:
          min_area: 8000
          mask:
            - 0.269,0.257,0.443,0.241,0.44,0.157,0.265,0.183
            - 0,1,0.156,1,0.279,1,0.184,0.783,0.139,0.709,0,0.656
    review:
      alerts:
        labels:
          - person
          - cat
    motion:
      mask: 
        0.958,1,0.848,0.67,0.765,0.485,0.638,0.248,0.59,0.243,0.544,0,0.738,0,0.899,0.192,1,0.361,1,1
    mqtt:
      enabled: false
    ui:
      order: 2
      dashboard: true

  kitchendeck:
    enabled: true
    ffmpeg:
      inputs:
        - path: rtsp://frigate:8554/kitchendeck
          input_args: preset-rtsp-restream
          roles:
            - detect
    detect:
      enabled: true
      width: 1920
      height: 1080
      fps: 5
    objects:
      track:
        - person
        - cat
      filters:
        person:
          min_area: 8000
    review:
      alerts:
        labels:
          - person
          - cat
    motion:
      mask: 
        0.272,0.384,0.364,0.205,0.367,0,0.296,0,0.194,0,0.141,0,0.087,0,0,0,0,1,0.069,1,0.141,0.723,0.21,0.524
    mqtt:
      enabled: false
    ui:
      order: 3
      dashboard: true

  backdeck:
    enabled: true
    ffmpeg:
      inputs:
        - path: rtsp://frigate:8554/backdeck
          input_args: preset-rtsp-restream
          roles:
            - detect
    detect:
      enabled: true
      width: 1920
      height: 1080
      fps: 5
    objects:
      track:
        - person
        - cat
      filters:
        person:
          min_area: 8000
          mask:
            - 96,720,482,474,475,362,701,248,862,226,891,115,1006,129,1071,60,0,61,0,720
    review:
      alerts:
        labels:
          - person
          - cat
    motion:
      mask:
        - 90,699,470,471,459,355,684,251,707,226,857,213,896,193,1000,209,1001,136,930,128,825,112,716,97,627,92,505,91,356,100,210,119,3,173,5,483,57,703
    zones:
      slidingdoor:
        coordinates: 987,429,889,428,902,350,992,359
      enterfrom_sideentrance:
        coordinates: 462,720,597,557,959,573,926,720
    mqtt:
      enabled: false
    ui:
      order: 4
      dashboard: true

  sideentrance:
    enabled: true
    ffmpeg:
      inputs:
        - path: rtsp://frigate:8554/sideentrance
          input_args: preset-rtsp-restream
          roles:
            - detect
    detect:
      enabled: true
      width: 1920
      height: 1080
      fps: 5
    objects:
      track:
        - person
        - cat
      filters:
        person:
          min_area: 8000
    review:
      alerts:
        labels:
          - person
          - cat
    mqtt:
      enabled: false
    ui:
      order: 5
      dashboard: true

  officedeck:
    enabled: true
    ffmpeg:
      inputs:
        - path: rtsp://frigate:8554/officedeck
          input_args: preset-rtsp-restream
          roles:
            - detect
    detect:
      enabled: true
      width: 1920
      height: 1080
      fps: 5
    objects:
      track:
        - person
        - cat
      filters:
        person:
          min_area: 8000
    mqtt:
      enabled: false
    ui:
      order: 6
      dashboard: true

  office2:
    enabled: false
    ffmpeg:
      inputs:
        - path: rtsp://frigate:8554/office2
          input_args: preset-rtsp-restream
          roles:
            - detect
    detect:
      enabled: true
      width: 1920
      height: 1080
      fps: 5
    objects:
      track:
        - person
        - cat
    mqtt:
      enabled: false
    ui:
      order: 7
      dashboard: true

#  test:
#    enabled: true
#    ffmpeg:
#      inputs:
#        - path: rtsp://frigate:8554/test
#          input_args: preset-rtsp-restream
#          roles:
#            - detect
#    detect:
#      enabled: true
#      width: 1920
#      height: 1080
#      fps: 5
#    objects:
#      track:
#        - person
#        - cat
#    mqtt:
#      enabled: false
#    ui:
#      order: 8
#      dashboard: true

ui:
  timezone: Pacific/Auckland

version: 0.16-0

docker-compose file or Docker CLI command

services:
  frigate:
    container_name: frigate
    privileged: true
    restart: unless-stopped
    image: ghcr.io/blakeblackshear/frigate:0.16.0-beta4-tensorrt
    shm_size: "512mb"
    volumes:
      - ./config/:/config/
      - ./media/:/media/frigate/
      - type: tmpfs
        target: /tmp/cache
        tmpfs:
          size: 1000000000
    ports:
      - "5000:5000"
      - "8554:8554"
      - "8555:8555/tcp"
      - "8555:8555/udp"
      - "1984:1984"
    environment:
      TZ: "Pacific/Auckland"
      FRIGATE_RTSP_PASSWORD: "xx"
      PLUS_API_KEY: "xx"
    deploy:
      resources:
        reservations:
          devices:
            - driver: nvidia
              count: 1
              capabilities: [gpu]
    networks:
      - net_frigate
    logging:
      driver: gelf
      options:
        gelf-address: udp://172.21.64.126:12201
        mode: non-blocking
        
networks:
  net_frigate:
    driver: bridge
    ipam:
      driver: default
      config:
        - subnet: 192.168.102.0/24

Relevant Frigate log output

i have not posted the logs here. there does not seem to be much in the logs that is meaningful (at least to me). I can post if required. I have posted the content of the MQTT messages and the response from the HTTP API (when querying after the fact). hopefully this formats ok.

{"before":{"id":"1752438631.822133-joq55d","camera":"cardeck","frame_time":1752438631.822133,"snapshot":null,"label":"cat","sub_label":null,"top_score":0,"false_positive":true,"start_time":1752438631.822133,"end_time":null,"score":0.7572305798530579,"box":[2465,506,2586,586],"area":9680,"ratio":1.5125,"region":[2048,225,2688,865],"active":true,"stationary":false,"motionless_count":0,"position_changes":0,"current_zones":[],"entered_zones":[],"has_clip":false,"has_snapshot":false,"attributes":{},"current_attributes":[],"pending_loitering":false,"max_severity":"alert","current_estimated_speed":0,"average_estimated_speed":0,"velocity_angle":0,"path_data":[],"recognized_license_plate":null},"after":{"id":"1752438631.822133-joq55d","camera":"cardeck","frame_time":1752438632.024026,"snapshot":{"frame_time":1752438631.822133,"box":[2465,506,2586,586],"area":9680,"region":[2048,225,2688,865],"score":0.7572305798530579,"attributes":[],"current_estimated_speed":0,"velocity_angle":0,"path_data":[],"recognized_license_plate":null,"recognized_license_plate_score":null},"label":"cat","sub_label":null,"top_score":0.8024799823760986,"false_positive":false,"start_time":1752438631.822133,"end_time":null,"score":0.7767334580421448,"box":[2465,506,2586,586],"area":9680,"ratio":1.5125,"region":[2048,225,2688,865],"active":true,"stationary":false,"motionless_count":1,"position_changes":0,"current_zones":[],"entered_zones":[],"has_clip":false,"has_snapshot":false,"attributes":{},"current_attributes":[],"pending_loitering":false,"max_severity":"alert","current_estimated_speed":0,"average_estimated_speed":0,"velocity_angle":0,"path_data":[[[0.9394,0.3855],1752438632.024026]],"recognized_license_plate":null},"type":"new"}


====

{"before":{"id":"1752438631.822133-joq55d","camera":"cardeck","frame_time":1752438632.024026,"snapshot":{"frame_time":1752438631.822133,"box":[2465,506,2586,586],"area":9680,"region":[2048,225,2688,865],"score":0.7572305798530579,"attributes":[],"current_estimated_speed":0,"velocity_angle":0,"path_data":[],"recognized_license_plate":null,"recognized_license_plate_score":null},"label":"cat","sub_label":null,"top_score":0.8024799823760986,"false_positive":false,"start_time":1752438631.822133,"end_time":null,"score":0.7767334580421448,"box":[2465,506,2586,586],"area":9680,"ratio":1.5125,"region":[2048,225,2688,865],"active":true,"stationary":false,"motionless_count":1,"position_changes":0,"current_zones":[],"entered_zones":[],"has_clip":false,"has_snapshot":false,"attributes":{},"current_attributes":[],"pending_loitering":false,"max_severity":"alert","current_estimated_speed":0,"average_estimated_speed":0,"velocity_angle":0,"path_data":[[[0.9394,0.3855],1752438632.024026]],"recognized_license_plate":null},"after":{"id":"1752438631.822133-joq55d","camera":"cardeck","frame_time":1752438632.225058,"snapshot":{"frame_time":1752438632.225058,"box":[2465,506,2586,586],"area":9680,"region":[2048,226,2688,866],"score":0.8409131169319153,"attributes":[],"current_estimated_speed":0,"velocity_angle":0,"path_data":[[[0.9394,0.3855],1752438632.024026]],"recognized_license_plate":null,"recognized_license_plate_score":null},"label":"cat","sub_label":null,"top_score":0.8109775185585022,"false_positive":false,"start_time":1752438631.822133,"end_time":null,"score":0.8409131169319153,"box":[2465,506,2586,586],"area":9680,"ratio":1.5125,"region":[2048,226,2688,866],"active":true,"stationary":false,"motionless_count":2,"position_changes":0,"current_zones":[],"entered_zones":[],"has_clip":false,"has_snapshot":false,"attributes":{},"current_attributes":[],"pending_loitering":false,"max_severity":"alert","current_estimated_speed":0,"average_estimated_speed":0,"velocity_angle":0,"path_data":[[[0.9394,0.3855],1752438632.024026],[[0.9394,0.3855],1752438632.225058]],"recognized_license_plate":null},"type":"update"}


====

{"before":{"id":"1752438631.822133-joq55d","camera":"cardeck","frame_time":1752438632.225058,"snapshot":{"frame_time":1752438632.225058,"box":[2465,506,2586,586],"area":9680,"region":[2048,226,2688,866],"score":0.8409131169319153,"attributes":[],"current_estimated_speed":0,"velocity_angle":0,"path_data":[[[0.9394,0.3855],1752438632.024026]],"recognized_license_plate":null,"recognized_license_plate_score":null},"label":"cat","sub_label":null,"top_score":0.8109775185585022,"false_positive":false,"start_time":1752438631.822133,"end_time":null,"score":0.8409131169319153,"box":[2465,506,2586,586],"area":9680,"ratio":1.5125,"region":[2048,226,2688,866],"active":true,"stationary":false,"motionless_count":2,"position_changes":0,"current_zones":[],"entered_zones":[],"has_clip":false,"has_snapshot":false,"attributes":{},"current_attributes":[],"pending_loitering":false,"max_severity":"alert","current_estimated_speed":0,"average_estimated_speed":0,"velocity_angle":0,"path_data":[[[0.9394,0.3855],1752438632.024026],[[0.9394,0.3855],1752438632.225058]],"recognized_license_plate":null},"after":{"id":"1752438631.822133-joq55d","camera":"cardeck","frame_time":1752438636.822601,"snapshot":{"frame_time":1752438635.822419,"box":[2468,507,2587,586],"area":9401,"region":[2048,225,2688,865],"score":0.9174950122833252,"attributes":[],"current_estimated_speed":0,"velocity_angle":0,"path_data":[[[0.9394,0.3855],1752438632.024026],[[0.9394,0.3855],1752438632.225058]],"recognized_license_plate":null,"recognized_license_plate_score":null},"label":"cat","sub_label":null,"top_score":0.8515394628047943,"false_positive":false,"start_time":1752438631.822133,"end_time":null,"score":0.9366627335548401,"box":[2468,505,2586,585],"area":9440,"ratio":1.475,"region":[2048,225,2688,865],"active":true,"stationary":false,"motionless_count":25,"position_changes":0,"current_zones":[],"entered_zones":[],"has_clip":false,"has_snapshot":false,"attributes":{},"current_attributes":[],"pending_loitering":false,"max_severity":"alert","current_estimated_speed":0,"average_estimated_speed":0,"velocity_angle":0,"path_data":[[[0.9394,0.3855],1752438632.024026],[[0.9394,0.3855],1752438632.225058]],"recognized_license_plate":null},"type":"update"}

====

{"before":{"id":"1752438631.822133-joq55d","camera":"cardeck","frame_time":1752438636.822601,"snapshot":{"frame_time":1752438635.822419,"box":[2468,507,2587,586],"area":9401,"region":[2048,225,2688,865],"score":0.9174950122833252,"attributes":[],"current_estimated_speed":0,"velocity_angle":0,"path_data":[[[0.9394,0.3855],1752438632.024026],[[0.9394,0.3855],1752438632.225058]],"recognized_license_plate":null,"recognized_license_plate_score":null},"label":"cat","sub_label":null,"top_score":0.8515394628047943,"false_positive":false,"start_time":1752438631.822133,"end_time":null,"score":0.9366627335548401,"box":[2468,505,2586,585],"area":9440,"ratio":1.475,"region":[2048,225,2688,865],"active":true,"stationary":false,"motionless_count":25,"position_changes":0,"current_zones":[],"entered_zones":[],"has_clip":false,"has_snapshot":false,"attributes":{},"current_attributes":[],"pending_loitering":false,"max_severity":"alert","current_estimated_speed":0,"average_estimated_speed":0,"velocity_angle":0,"path_data":[[[0.9394,0.3855],1752438632.024026],[[0.9394,0.3855],1752438632.225058]],"recognized_license_plate":null},"after":{"id":"1752438631.822133-joq55d","camera":"cardeck","frame_time":1752438636.822601,"snapshot":{"frame_time":1752438635.822419,"box":[2468,507,2587,586],"area":9401,"region":[2048,225,2688,865],"score":0.9174950122833252,"attributes":[],"current_estimated_speed":0,"velocity_angle":0,"path_data":[[[0.9394,0.3855],1752438632.024026],[[0.9394,0.3855],1752438632.225058]],"recognized_license_plate":null,"recognized_license_plate_score":null},"label":"cat","sub_label":null,"top_score":0.8515394628047943,"false_positive":false,"start_time":1752438631.822133,"end_time":1752438642.026375,"score":0.9366627335548401,"box":[2468,505,2586,585],"area":9440,"ratio":1.475,"region":[2048,225,2688,865],"active":true,"stationary":false,"motionless_count":25,"position_changes":0,"current_zones":[],"entered_zones":[],"has_clip":false,"has_snapshot":false,"attributes":{},"current_attributes":[],"pending_loitering":false,"max_severity":"alert","current_estimated_speed":0,"average_estimated_speed":0,"velocity_angle":0,"path_data":[[[0.9394,0.3855],1752438632.024026],[[0.9394,0.3855],1752438632.225058]],"recognized_license_plate":null},"type":"end"}


===

web response
http://172.21.64.125:5000/api/events/1752438631.822133-joq55d/snapshot.jpg?bbox=0
{"success":false,"message":"Live frame not available"}

Relevant go2rtc log output

not sure this is relevant frigate does receive the video streams ok. i am using the latest version of go2rtc - not the bundled one.

Operating system

Other Linux

Install method

Docker Compose

Network connection

Wired

Camera make and model

axis various models

Screenshots of the Frigate UI's System metrics pages

not sure this will be needed. server is well spec'ed and does not seem to have any performance issues. running on a tesla gpu.

Any other information that may be helpful

can provide other information as required.

hawkeye217 · 2025-07-14T02:10:28Z

hawkeye217
Jul 14, 2025
Collaborator

I'd be very surprised if this was some kind of Frigate bug, as something as severe as "missing" events would be much more highly reported considering Frigate's userbase.

There are a few important points to consider in your use case:

The frigate/events MQTT topic is a raw topic. False positives and tracked objects that will not be retained are reported with this topic. It's the user's responsibility to filter these out (by checking false_positive, for example).
The snapshot endpoint will always return a valid snapshot for in-progress objects, but as soon as the object's lifecycle is ended, there may not be a snapshot immediately available. has_snapshot is set to true when a frame is saved. The snapshot response is generated on the fly until the object stops being detected at which point they are written to a file.

There's more I could add, but those are the first few things that are the most important to check.

0 replies

chrish987 · 2025-07-14T05:25:26Z

chrish987
Jul 14, 2025
Author

Thanks for the quick response. One thing I have checked is the false positive flag in the MQTT messages, and it is always false, except for the first message with the type of new. I have also noticed that the has_snapshot and has_clip fields are also always false (in the mQTT events message) - yet a snapshot is returned from the API (when queried which the event is active). From your second bullet - does this mean the has_snapshot field is only really valid when the event has finished and a snapshot has been saved? I have not checked that - I can query the API for event details for one of my missing events and see if it exists - I have only tried to grab the snapshots upto now. Might be a couple of days before I can update as I am away from home.

…

________________________________ From: Josh Hawkins ***@***.***> Sent: Monday, July 14, 2025 2:10 PM To: blakeblackshear/frigate ***@***.***> Cc: Chris Henderson ***@***.***>; Author ***@***.***> Subject: Re: [blakeblackshear/frigate] [Bug]: Some events 'disappear' (Discussion #19135) I'd be very surprised if this was some kind of Frigate bug, as something as severe as "missing" events would be much more highly reported considering Frigate's userbase. There are a few important points to consider in your use case: * The frigate/events MQTT topic is a raw topic. False positives and tracked objects that will not be retained are reported with this topic. It's the user's responsibility to filter these out (by checking false_positive, for example). * The snapshot endpoint will always return a valid snapshot for in-progress objects, but as soon as the object's lifecycle is ended, there may not be a snapshot immediately available. has_snapshot is set to true when a frame is saved. The snapshot response is generated on the fly until the object stops being detected at which point they are written to a file. There's more I could add, but those are the first few things that are the most important to check. — Reply to this email directly, view it on GitHub<#19135 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ASRHCNSBBN5DQI3FGXLTLPD3IMGSVAVCNFSM6AAAAACBNTKWBKVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTGNZUGY4TONA>. You are receiving this because you authored the thread.Message ID: ***@***.***>

0 replies

chrish987 · 2025-07-14T05:40:19Z

chrish987
Jul 14, 2025
Author

I have just done a quick check on the API - to get the event details - not try and get a snapshot.

http://172.21.64.125:5000/api/events/1752438631.822133-joq55d
"Event not found"

This is the same event as in the logs section about with the MQTT messages - and at no point was it marked as a false positive.

3 replies

hawkeye217 Jul 14, 2025
Collaborator

As noted, the frigate/events topic is raw and without filters. One of the other necessary conditions for Frigate to register a valid tracked object is that it must change position at least once (position_changes > 0). The cat object you showed MQTT messages for above never changed position before it ended, so it was not registered as a tracked object/event. This would explain why 1752438631.822133-joq55d returns "event not found".

NickM-27 Jul 14, 2025
Collaborator Sponsor

The issue here is has_snapshot without that or has_clip being true you'll never have the event saved. The snapshot API will return a snapshot while the event is ongoing since an object can always register and be eligible for a snapshot.

hawkeye217 Jul 14, 2025
Collaborator

Right, here's some pertinent code in Frigate for clarity:

The check for position_changes to save a snapshot and set has_snapshot:

frigate/frigate/track/object_processing.py

Line 225 in 4b72c86

if obj.obj_data["position_changes"] == 0:

The check for position_changes to retain a recording and set has_clip:

frigate/frigate/track/object_processing.py

Line 249 in 4b72c86

if obj.obj_data["position_changes"] == 0:

The event end callback:

frigate/frigate/track/object_processing.py

Line 127 in 4b72c86

def end(camera: str, obj: TrackedObject, frame_name: str):

The database cleanup:

frigate/frigate/events/cleanup.py

Line 337 in 4b72c86

# drop events from db where has_clip and has_snapshot are false

chrish987 · 2025-07-14T20:32:48Z

chrish987
Jul 14, 2025
Author

ok. makes sense. i can check the position changes easily enough.

I guess a valid question - is the current behaviour correct? There definitely was a cat in the example above. The percentage of these is not insignificant. Is it worth me checking more examples to see if the detected object was there or not - or is the feeling that changing the current behaviour would cause a significant number of false positives?

1 reply

NickM-27 Jul 14, 2025
Collaborator Sponsor

yes, there are no signs that the current behavior is not working as intended. If the object never moves then it is likely a false positive. If a true positive fails then this detection likely needs to be adjusted so that the object is correctly detected.

Uh oh!

[Support]: Some events 'disappear' #19135

Uh oh!

Uh oh!

chrish987 Jul 14, 2025

Checklist

Describe the problem you are having

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Screenshots of the Frigate UI's System metrics pages

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Replies: 4 comments · 4 replies

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hawkeye217 Jul 14, 2025 Collaborator

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chrish987 Jul 14, 2025 Author

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chrish987 Jul 14, 2025 Author

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hawkeye217 Jul 14, 2025 Collaborator

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NickM-27 Jul 14, 2025 Collaborator Sponsor

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hawkeye217 Jul 14, 2025 Collaborator

Uh oh!

chrish987 Jul 14, 2025 Author

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NickM-27 Jul 14, 2025 Collaborator Sponsor

chrish987
Jul 14, 2025

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