[Bug]: Preview generation fails after Frigate restart when camera name is a prefix of another camera name (e.g. patio_lower / patio_lower_thermal)

[TCS-UK]

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.
• I have asked the AI at https://docs.frigate.video about my issue.

Describe the problem you are having

PreviewRecorder.__init__ uses file.startswith(file_start) to scan cached preview
frame files on startup. Because file_start is built from the camera name without a
trailing dash (e.g. "preview_patio_lower"), it incorrectly matches files belonging to
cameras whose names share that prefix (e.g. "preview_patio_lower_thermal-xxx.webp").

This causes phantom timestamps from the wrong camera to be loaded into output_frames.
When FFMpegConverter runs at the next hour boundary, it builds a concat playlist using
the correct camera's file paths for those timestamps — but those files don't exist (only
the other camera's files exist at those timestamps). FFmpeg fails with:

Error opening input: Invalid data found when processing input
Error opening input file /dev/stdin.
Error opening input files: Invalid data found when processing input

The missing preview is then skipped entirely (no .mp4 written for that hour).

This is triggered every time Frigate restarts (process restart via s6, not full container
restart) when:

1. The preview frame cache (/tmp/cache/preview_frames/) is not cleared on restart
   (i.e. cache is a Docker tmpfs that persists across s6 restarts)
2. At least two cameras exist where one name is a prefix of the other (common with
   Frigate's own _thermal naming convention)

Steps to reproduce

Steps to Reproduce

1. Configure two cameras where one name is a prefix of the other, e.g.:
   • patio_lower (regular camera)
   • patio_lower_thermal (thermal channel of the same physical camera)
     (This also affects front_door / front_door_thermal, compost_bin /
     compost_bin_thermal, etc.)
2. Let both cameras accumulate preview frames for some time within an hour
3. Restart the Frigate process (not the Docker container) — e.g. via docker exec or an
   s6-triggered restart due to a crash
4. Wait for the next hour boundary

Result: frigate.output.preview logs Error saving preview for <camera> and no
preview MP4 is written for that hour segment.

Expected: Preview generation succeeds using only frames belonging to the named camera.

Root Cause

File: frigate/output/preview.py, PreviewRecorder.__init__, approximately line 218:

# BUG: matches "preview_patio_lower_thermal-xxx.webp" when camera is "patio_lower"
if not file.startswith(file_start):
    continue

The file_start string is f"preview_{config.name}" (e.g. "preview_patio_lower").
Without a trailing "-", it matches any camera whose name begins with config.name.

Fix

Append "-" to file_start in the startswith check so it only matches exact camera
names:

# Before
if not file.startswith(file_start):

# After
if not file.startswith(file_start + "-"):

"preview_patio_lower_thermal-xxx.webp".startswith("preview_patio_lower-") → False ✓
"preview_patio_lower-xxx.webp".startswith("preview_patio_lower-") → True ✓


### Version

0.17.1-416a9b7

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

_No response_

### Frigate config file

```yaml
version: 0.17-1

# MQTT disabled - not using Home Assistant integration
mqtt:
enabled: false

# ONNX detectors - one per GPU, share a common detection queue across all cameras
# "device" is not documented in the public detector docs; using based on code review and runtime testing.
detectors:
nvidia_v100_0:
  type: onnx
  device: '0'
nvidia_v100_1:
  type: onnx
  device: '1'

# TLS - cert mounted via Docker Compose volumes into container
tls:
enabled: true

# Frigate+ model - YOLOv9s 320x320, SOTA, CUDA Graphs accelerated on Nvidia
model:
path: plus://blablabla

# Birdseye - single composited view showing cameras with motion
birdseye:
enabled: true
# Options: objects, motion or continuous
mode: motion
width: 1280
height: 720
restream: false

# Global ffmpeg - Nvidia GPU hardware acceleration
# All cameras explicitly set gpu: 0 or gpu: 1 at camera ffmpeg level
ffmpeg:
hwaccel_args: preset-nvidia

# Global object tracking and score filters
# NOTE: camera-level objects.track REPLACES this list entirely (no merge).
# If a camera defines objects.track, list every label wanted for that camera.
# Prefer camera-level track lists to suppress unwanted objects rather than
# review alert/detection label filters — inference still runs on all objects
# regardless, but unlisted labels are discarded post-inference and never enter
# the tracking or review pipelines, keeping those clean without extra config.
objects:
track:
  - person
  - car
  - dog
  - cat
  - bird
filters:
  person:
    min_score: 0.65
    threshold: 0.85

# Global recording retention
record:
enabled: true
# sync_recordings: True
# WARNING: High CPU cost - only enable temporarily to resync DB after manual deletion.
continuous:
  days: 3
motion:
  days: 14
alerts:
  pre_capture: 5
  post_capture: 5
  retain:
    days: 60
    mode: all
detections:
  pre_capture: 5
  post_capture: 5
  retain:
    days: 30
    mode: motion

# Global snapshot configuration
# clean_copy + enabled required for Frigate+ image submission
snapshots:
enabled: true
clean_copy: true       # Required for Frigate+ - no timestamp/bbox on submitted copy
timestamp: true        # Timestamp on review copy only
bounding_box: true     # Bounding box on review copy only
crop: false            # Full frame retained for Frigate+ context
quality: 85            # Increased from default 70 for Frigate+ submission quality
retain:
  default: 14
  objects:
    person: 30         # Extended retention to maximise Frigate+ submission pool

go2rtc:
log:
  level: warn     # keep general noise low
  streams: debug  # log stream producer state changes (CONN state, reconnects)
  rtsp: debug     # log RTSP connection events (DESCRIBE, SETUP, teardown)
  onvif: debug    # TEMP: diagnosing axis_intercom_onvif 404 — remove after fix

ffmpeg:
  # Named GPU decode templates used by ffmpeg: Currently not using!
  cuda0: -fflags nobuffer -flags low_delay -timeout 5000000 -user_agent 
    go2rtc/ffmpeg -hwaccel_device 0 -rtsp_transport tcp -i {input}
  cuda1: -fflags nobuffer -flags low_delay -timeout 5000000 -user_agent 
    go2rtc/ffmpeg -hwaccel_device 1 -rtsp_transport tcp -i {input}

webrtc:
  candidates:
    - frigate.domain.com:8555
    - 192.168.40.120:8555
    - stun:8555
    - stun:stun.l.google.com:19302

streams:
# -----------------------------------------------------------------------
  # AXIS I8016-LVE — 192.168.20.20 | GPU 0 | Two-way audio (ONVIF backchannel)
  # axis_intercom_detect : 1600x1200 | 5fps  | GOP 5         | H.264 | detect / live
  # axis_intercom_record : 2592x1944 | 15fps | GOP 15        | H.264 | record / live HD (5MP full quality)
  # axis_intercom_onvif  : ONVIF profile0    | 5fps  | GOP 5  | H.264 | live talkback + on-demand opus/aac transcode
  # pipeline             : direct RTSP passthrough — NVDEC decode handled by Frigate (GPU 0)
  # -----------------------------------------------------------------------

  axis_intercom_detect:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.20/axis-media/media.amp?videocodec=h264&streamprofile=frigate_detect

  axis_intercom_record:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.20/axis-media/media.amp?videocodec=h264&streamprofile=frigate_record
  axis_intercom_onvif:
    - onvif://{FRIGATE_CAMLOGIN}@192.168.20.20?profile=profile_0_h264
    - ffmpeg:axis_intercom_onvif#audio=opus
    - ffmpeg:axis_intercom_onvif#audio=aac

  # -----------------------------------------------------------------------
  # FRONT DOOR — Hikvision 192.168.20.77 | GPU 0 | 270° rotation | audio from axis_intercom_record
  # front_door_raw : 2688x1520 (pre-rotation) | 15fps | GOP 15        | H.264 | source passthrough
  # front_door     : 1520x2688 (rotated)      | 15fps | GOP 15        | H.264 (h264_nvenc) + AAC 48kHz | record / live HD
  # front_door_sub : 720x1280  (rotated)      | 5fps  | GOP 5         | H.264 (h264_nvenc) + AAC 48kHz | detect / live SD
  # pipeline       : NVDEC H.264 (GPU 0) → CPU transpose → hwupload_cuda → scale_cuda → h264_nvenc (GPU 0)
  #                  axis_intercom_record audio mixed in by ffmpeg → AAC 48kHz | Opus self-ref for WebRTC
  # -----------------------------------------------------------------------
  front_door_raw:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.77:554/Streaming/Channels/101

  front_door:
    - exec:/usr/lib/ffmpeg/7.0/bin/ffmpeg -hide_banner -rtsp_transport tcp 
      -hwaccel cuda -hwaccel_device 0 -i rtsp://127.0.0.1:8554/front_door_raw 
      -rtsp_transport tcp -i rtsp://127.0.0.1:8554/axis_intercom_record -map 
      0:v -map 1:a -vf transpose=2,hwupload_cuda=device=0,scale_cuda=1520:2688
      -c:v h264_nvenc -gpu 0 -preset p1 -tune ll -rc cbr -b:v 8M -maxrate 8M 
      -bufsize 8M -r 15 -g 15 -keyint_min 15 -bf 0 -c:a aac -ar 48000 -ac 1 
      -b:a 64k -f rtsp -rtsp_transport tcp {{output}}
    - ffmpeg:front_door#audio=opus

  front_door_sub:
    - exec:/usr/lib/ffmpeg/7.0/bin/ffmpeg -hide_banner -rtsp_transport tcp 
      -hwaccel cuda -hwaccel_device 0 -i rtsp://127.0.0.1:8554/front_door_raw 
      -rtsp_transport tcp -i rtsp://127.0.0.1:8554/axis_intercom_record -map 
      0:v -map 1:a -vf transpose=2,hwupload_cuda=device=0,scale_cuda=720:1280 
      -c:v h264_nvenc -gpu 0 -preset p1 -tune ll -rc cbr -b:v 2M -maxrate 2M 
      -bufsize 2M -r 5 -g 5 -keyint_min 5 -bf 0 -c:a aac -ar 48000 -ac 1 -b:a 
      64k -f rtsp -rtsp_transport tcp {{output}}
    - ffmpeg:front_door_sub#audio=opus

  # -----------------------------------------------------------------------
  # PATIO LOWER — Hikvision 192.168.20.158 | GPU 1 | no rotation | no audio
  # patio_lower     : 2688x1520 | 15fps | GOP 15 | H.264 | source passthrough | record
  # patio_lower_sub : 1280x720  | 5fps  | GOP 5  | H.264 (h264_nvenc)        | detect / live SD
  # pipeline        : NVDEC H.264 (GPU 1) → scale_cuda (GPU 1) → h264_nvenc (GPU 1)
  # -----------------------------------------------------------------------
  patio_lower:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.158:554/Streaming/Channels/101

  patio_lower_sub:
    - exec:/usr/lib/ffmpeg/7.0/bin/ffmpeg -hide_banner -rtsp_transport tcp 
      -hwaccel cuda -hwaccel_device 1 -hwaccel_output_format cuda -i 
      rtsp://127.0.0.1:8554/patio_lower -an -vf scale_cuda=1280:720 -c:v 
      h264_nvenc -gpu 1 -preset p2 -tune ll -rc cbr -b:v 2M -maxrate 2M 
      -bufsize 2M -r 5 -g 5 -keyint_min 5 -bf 0 -f rtsp -rtsp_transport tcp 
      {{output}}

  # -----------------------------------------------------------------------
  # COMPOST BIN — Hikvision 192.168.20.76 | GPU 1 | no rotation | no audio
  # compost_bin     : 2688x1520      | 15fps         | GOP 15 | H.264 | source passthrough | record
  # compost_bin_sub : 1280x720      | 5fps          | GOP 5  | H.264 (h264_nvenc)        | detect / live SD
  # pipeline        : NVDEC H.264 (GPU 1) → scale_cuda (GPU 1) → h264_nvenc (GPU 1)
  # -----------------------------------------------------------------------
  compost_bin:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.76:554/Streaming/Channels/101

  compost_bin_sub:
    - exec:/usr/lib/ffmpeg/7.0/bin/ffmpeg -hide_banner -rtsp_transport tcp 
      -hwaccel cuda -hwaccel_device 1 -hwaccel_output_format cuda -i 
      rtsp://127.0.0.1:8554/compost_bin -an -vf scale_cuda=1280:720 -c:v 
      h264_nvenc -gpu 1 -preset p2 -tune ll -rc cbr -b:v 2M -maxrate 2M 
      -bufsize 2M -r 5 -g 5 -keyint_min 5 -bf 0 -f rtsp -rtsp_transport tcp 
      {{output}}

  # -----------------------------------------------------------------------
  # FRONT DOOR THERMAL — Hikvision 192.168.20.77 ch.201 | GPU 0 | 270° rotation | no audio
  # front_door_thermal_raw : 640x480 (pre-rotation) | 6fps | GOP 6         | H.264 | source passthrough
  # front_door_thermal     : 480x640 (rotated)      | 6fps | GOP 6         | H.264 (h264_nvenc) | detect + record
  # pipeline               : NVDEC H.264 (GPU 0) → CPU transpose → hwupload_cuda → scale_cuda → h264_nvenc (GPU 0)
  # -----------------------------------------------------------------------
  front_door_thermal_raw:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.77:554/Streaming/Channels/201

  front_door_thermal:
    - exec:/usr/lib/ffmpeg/7.0/bin/ffmpeg -hide_banner -rtsp_transport tcp 
      -hwaccel cuda -hwaccel_device 0 -i 
      rtsp://127.0.0.1:8554/front_door_thermal_raw -an -vf 
      transpose=2,hwupload_cuda=device=0,scale_cuda=480:640 -c:v h264_nvenc 
      -gpu 0 -preset p1 -tune ll -rc cbr -b:v 1M -maxrate 1M -bufsize 1M -r 6 
      -g 6 -keyint_min 6 -bf 0 -f rtsp -rtsp_transport tcp {{output}}

  # -----------------------------------------------------------------------
  # PATIO LOWER THERMAL — Hikvision 192.168.20.158 ch.201 | GPU 1 | no rotation | no audio
  # patio_lower_thermal : 640x480 | 6fps | GOP 6 | H.264 | detect + record
  # pipeline            : direct RTSP passthrough — NVDEC decode handled by Frigate (GPU 1)
  # -----------------------------------------------------------------------
  patio_lower_thermal:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.158:554/Streaming/Channels/201

  # -----------------------------------------------------------------------
  # UTILITY WINDOW — Hikvision 192.168.20.151 | GPU 1 | no rotation | no audio
  # utility_window     : 2688x1520 | 15fps | GOP 15 | H.264 | source passthrough        | record
  # utility_window_sub : 1280x720  | 5fps  | GOP 5  | H.264 (h264_nvenc)               | detect / live SD
  # pipeline           : NVDEC H.264 (GPU 1) → scale_cuda (GPU 1) → h264_nvenc (GPU 1)
  # -----------------------------------------------------------------------
  utility_window:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.151:554/Streaming/Channels/101

  utility_window_sub:
    - exec:/usr/lib/ffmpeg/7.0/bin/ffmpeg -hide_banner -rtsp_transport tcp
      -hwaccel cuda -hwaccel_device 1 -hwaccel_output_format cuda -i
      rtsp://127.0.0.1:8554/utility_window -an -vf scale_cuda=1280:720 -c:v
      h264_nvenc -gpu 1 -preset p2 -tune ll -rc cbr -b:v 2M -maxrate 2M
      -bufsize 2M -r 5 -g 5 -keyint_min 5 -bf 0 -f rtsp -rtsp_transport tcp
      {{output}}

  # -----------------------------------------------------------------------
  # UTILITY WINDOW THERMAL — Hikvision 192.168.20.151 ch.201 | GPU 1 | no rotation | no audio
  # utility_window_thermal : 640x480 | 6fps | GOP 6 | H.264 | detect + record
  # pipeline               : direct RTSP passthrough — NVDEC decode handled by Frigate (GPU 1)
  # -----------------------------------------------------------------------
  utility_window_thermal:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.151:554/Streaming/Channels/201

  # -----------------------------------------------------------------------
  # COMPOST BIN THERMAL — Hikvision 192.168.20.76 ch.201 | GPU 1 | no rotation | no audio
  # compost_bin_thermal : 640x480 | 6fps | GOP 6         | H.264 | detect + record
  # pipeline            : direct RTSP passthrough — NVDEC decode handled by Frigate (GPU 1)
  # -----------------------------------------------------------------------
  compost_bin_thermal:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.76:554/Streaming/Channels/201

  # -----------------------------------------------------------------------
  # GARDEN FIXED — Axis 192.168.20.66 | GPU 1 | no rotation | no audio
  # garden_fixed     : 2048x1536      | 15fps         | GOP 15 | H.264 | frigate_record profile | record
  # garden_fixed_sub : 1280x960      | 5fps          | GOP 5         | H.264 | frigate_detect profile | detect / live SD
  # pipeline         : direct RTSP passthrough — NVDEC decode handled by Frigate (GPU 1)
  # -----------------------------------------------------------------------
  garden_fixed:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.66/axis-media/media.amp?videocodec=h264&streamprofile=frigate_record

  garden_fixed_sub:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.66/axis-media/media.amp?videocodec=h264&streamprofile=frigate_detect

  # -----------------------------------------------------------------------
  # BACK DOOR — Axis 192.168.20.54 | GPU 1 | no rotation | no audio
  # back_door     : 1280x960       | 15fps         | GOP 15 | H.264 | frigate_record profile | record
  # back_door_sub : 1024x768      | 5fps          | GOP 5         | H.264 | frigate_detect profile | detect / live SD
  # pipeline      : direct RTSP passthrough — NVDEC decode handled by Frigate (GPU 1)
  # -----------------------------------------------------------------------
  back_door:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.54/axis-media/media.amp?videocodec=h264&streamprofile=frigate_record

  back_door_sub:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.54/axis-media/media.amp?videocodec=h264&streamprofile=frigate_detect

  # -----------------------------------------------------------------------
  # HALLWAY — Axis M1065-L 192.168.20.56 | GPU 1 | no rotation | no audio
  # hallway     : 1920x1080 | 15fps | GOP 15 | H.264 | frigate_record profile | record
  # hallway_sub : 1280x720  | 5fps  | GOP 5  | H.264 | frigate_detect profile | detect / live SD
  # pipeline    : direct RTSP passthrough — NVDEC decode handled by Frigate (GPU 1)
  #               Opus self-ref on record stream for WebRTC live audio
  # -----------------------------------------------------------------------
  hallway:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.56/axis-media/media.amp?videocodec=h264&streamprofile=frigate_record#media=video
    #[AUDIO_DISABLED] - ffmpeg:hallway#audio=opus

  hallway_sub:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.56/axis-media/media.amp?videocodec=h264&streamprofile=frigate_detect

  # -----------------------------------------------------------------------
  # KITCHEN — Axis M1065-L 192.168.20.57 | GPU 1 | no rotation | no audio
  # kitchen     : 1920x1080 | 15fps | GOP 15 | H.264 | frigate_record profile | record
  # kitchen_sub : 1280x720  | 5fps  | GOP 5  | H.264 | frigate_detect profile | detect / live SD
  # pipeline    : direct RTSP passthrough — NVDEC decode handled by Frigate (GPU 1)
  #               Opus self-ref on record stream for WebRTC live audio
  # -----------------------------------------------------------------------
  kitchen:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.57/axis-media/media.amp?videocodec=h264&streamprofile=frigate_record#media=video
    #[AUDIO_DISABLED] - ffmpeg:kitchen#audio=opus

  kitchen_sub:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.57/axis-media/media.amp?videocodec=h264&streamprofile=frigate_detect

  # -----------------------------------------------------------------------
  # LANDING — Axis M1065-L 192.168.20.68 | GPU 1 | no rotation | no audio
  # landing     : 1920x1080 | 15fps | GOP 15 | H.264 | frigate_record profile | record
  # landing_sub : 1280x720  | 5fps  | GOP 5  | H.264 | frigate_detect profile | detect / live SD
  # pipeline    : direct RTSP passthrough — NVDEC decode handled by Frigate (GPU 1)
  #               Opus self-ref on record stream for WebRTC live audio
  # -----------------------------------------------------------------------
  landing:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.68/axis-media/media.amp?videocodec=h264&streamprofile=frigate_record#media=video
    #[AUDIO_DISABLED] - ffmpeg:landing#audio=opus

  landing_sub:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.68/axis-media/media.amp?videocodec=h264&streamprofile=frigate_detect

  # -----------------------------------------------------------------------
  # GARAGE INTERNAL — Axis M1065-L 192.168.20.73 | GPU 1 | no rotation | audio
  # garage_internal     : 1920x1080 | 15fps | GOP 15 | H.264 | frigate_record profile | record
  # garage_internal_sub : 1280x720  | 5fps  | GOP 5  | H.264 | frigate_detect profile | detect / live SD
  # pipeline            : direct RTSP passthrough — NVDEC decode handled by Frigate (GPU 1)
  #                       Opus self-ref on record stream for WebRTC live audio
  # -----------------------------------------------------------------------
  garage_internal:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.73/axis-media/media.amp?videocodec=h264&streamprofile=frigate_record
    - ffmpeg:garage_internal#audio=opus

  garage_internal_sub:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.73/axis-media/media.amp?videocodec=h264&streamprofile=frigate_detect

  # -----------------------------------------------------------------------
  # BIRDBOX — Axis M1065-L 192.168.20.65 | GPU 1 | no rotation | audio
  # birdbox     : 1920x1080 | 25fps | GOP 25 | H.264 | frigate_record profile | record
  # birdbox_sub : 1280x720  | 10fps | GOP 10 | H.264 | frigate_detect profile | detect / live SD
  # pipeline    : direct RTSP passthrough — NVDEC decode handled by Frigate (GPU 1)
  #               Opus self-ref on record stream for WebRTC live audio
  # -----------------------------------------------------------------------
  birdbox:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.65/axis-media/media.amp?videocodec=h264&streamprofile=frigate_record
    - ffmpeg:birdbox#audio=opus

  birdbox_sub:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.65/axis-media/media.amp?videocodec=h264&streamprofile=frigate_detect

  # -----------------------------------------------------------------------
  # PATIO — Axis Q1645 192.168.20.64 | GPU 1 | no rotation | audio
  # patio     : 1920x1080 | 15fps | GOP 15 | H.264 | frigate_record profile | record
  # patio_sub : 1280x720  | 5fps  | GOP 5  | H.264 | frigate_detect profile | detect / live SD
  # pipeline  : direct RTSP passthrough — NVDEC decode handled by Frigate (GPU 1)
  #             Opus self-ref on record stream for WebRTC live audio
  # -----------------------------------------------------------------------
  patio:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.64/axis-media/media.amp?videocodec=h264&streamprofile=frigate_record
    - ffmpeg:patio#audio=opus

  patio_sub:
    - rtsp://{FRIGATE_CAMLOGIN}@192.168.20.64/axis-media/media.amp?videocodec=h264&streamprofile=frigate_detect

  # -----------------------------------------------------------------------
  # DAHUA TEST — 192.168.20.150 | GPU 0 | no rotation | TEST ONLY — remove when done
  # dahua_test     : 4000x3000 | 25fps | GOP 25        | H.265 | exec -c copy (direct, bypasses go2rtc RTSP negotiation)
  # dahua_test_sub : 2000x1500 | 10fps | GOP 10        | H.264 (h264_nvenc) | detect only (internal restream)
  # pipeline       : dahua_test (internal go2rtc) → NVDEC H.265 (GPU 0) → scale_cuda (GPU 0) → h264_nvenc (GPU 0)
  # -----------------------------------------------------------------------
  dahua_test:
    - exec:/usr/lib/ffmpeg/7.0/bin/ffmpeg -hide_banner -rtsp_transport tcp -i 
      rtsp://{FRIGATE_CAMLOGIN}@192.168.20.150:554/cam/realmonitor?channel=1&subtype=0
      -c copy -f rtsp -rtsp_transport tcp {{output}}

  dahua_test_sub:
    - exec:/usr/lib/ffmpeg/7.0/bin/ffmpeg -hide_banner -rtsp_transport tcp 
      -hwaccel cuda -hwaccel_device 0 -hwaccel_output_format cuda -i 
      rtsp://127.0.0.1:8554/dahua_test -an -vf scale_cuda=2000:1500 -c:v 
      h264_nvenc -gpu 0 -preset p2 -tune ll -rc cbr -b:v 4M -maxrate 4M 
      -bufsize 16M -r 10 -g 10 -keyint_min 10 -bf 0 -f rtsp -rtsp_transport 
      tcp {{output}}

cameras:

# =======================================================================
# HWACCEL PRESET REFERENCE
# =======================================================================
# All cameras use preset-nvidia as the hwaccel_args value.
#
#   preset-nvidia  — The only documented Nvidia preset per official Frigate docs
#                    (https://docs.frigate.video/configuration/ffmpeg_presets/).
#                    Expands to: -hwaccel cuda -hwaccel_output_format cuda
#                    NVDEC auto-detects the input codec — works for both H.264
#                    and H.265 streams with no additional configuration.
#
# CODEC STRATEGY:
#   Most cameras output H.264. Record streams use c:v copy (direct passthrough)
#   or h264_nvenc (exec pipeline re-encode). Hikvision detect sub-streams use
#   h264_nvenc re-encode; Axis and thermal streams use direct RTSP passthrough.
#   Exception: Dahua record stream is H.265 (native camera output, c:v copy).
# =======================================================================

# -----------------------------------------------------------------------
# AXIS I8016-LVE — 192.168.20.20 | GPU 0 | two-way audio
# -----------------------------------------------------------------------
axis_intercom:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 0
    inputs:
      - path: rtsp://127.0.0.1:8554/axis_intercom_record
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/axis_intercom_detect
        input_args: preset-rtsp-restream
        roles:
          - detect
    output_args:
      # audio: AAC 48 kHz 64k — camera native 16 kHz is silently dropped by iOS
      record: -f segment -segment_time 10 -segment_format mp4 
        -reset_timestamps 1 -strftime 1 -c:v copy -c:a aac -ar 48000 -b:a 64k
  detect:
    enabled: true
    width: 1600
    height: 1200
    fps: 5
  motion:
    threshold: 30
    contour_area: 10
    improve_contrast: false
    mask: 0.563,0.324,0.649,0,0,0,0,0.499,0.567,0.497
  ui:
    dashboard: true
  birdseye:
    enabled: true
  live:
    streams:
      SD Stream: axis_intercom_detect
      SD Talkback: axis_intercom_onvif
      HD Stream: axis_intercom_record

# -----------------------------------------------------------------------
# FRONT DOOR — Hikvision 192.168.20.77 | GPU 0 | 270° rotation | audio
# -----------------------------------------------------------------------
front_door:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 0
    inputs:
      - path: rtsp://127.0.0.1:8554/front_door
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/front_door_sub
        input_args: preset-rtsp-restream
        roles:
          - detect
    output_args:
      # audio: AAC 48 kHz already encoded by exec — copy both tracks directly
      record: preset-record-generic-audio-copy
  detect:
    enabled: true
    width: 720
    height: 1280
    fps: 5
    stationary:
      # Lowered from default 50 - parked car reaches stationary in 3s at 5fps
      threshold: 15
  motion:
    mask: 0,0.142,0.235,0.173,0.29,0.434,0.087,0.969,0,0.974
    threshold: 35      # Raised from 30 - reduces rain streak false motion triggers
    contour_area: 15   # Raised from 10 - discards small rain blob scatter
    improve_contrast: false
  objects:
    filters:
      car:
        min_area: 7500  # Filters clipped partial detections (~5208px² observed) and rain artifacts
        mask: 
          0,0.855,0.123,0.893,0.297,0.43,0.553,0.425,0.697,0.342,1,0.412,1,1,0,1
  zones:
    front_door_car_zone_1:
      coordinates: 
        0.293,0.427,0.246,0.169,0.137,0.145,0,0.123,0.226,-0.002,0.415,0.005,0.447,0.029,0.601,0.04,0.706,0.041,0.722,0.094,0.662,0.092,0.777,0.14,1,0.179,1,0.409,0.698,0.335,0.562,0.416
      inertia: 3
      loitering_time: 0
      objects: car
  review:
    alerts:
      required_zones:
        - front_door_car_zone_1
  ui:
    dashboard: true
  birdseye:
    enabled: true
  live:
    streams:
      SD Stream: front_door_sub
      HD Stream: front_door


# -----------------------------------------------------------------------
# FRONT DOOR THERMAL — Hikvision 192.168.20.77 ch.201 | GPU 0 | 270° rotation | no audio
# -----------------------------------------------------------------------
front_door_thermal:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 0
    inputs:
      - path: rtsp://127.0.0.1:8554/front_door_thermal
        input_args: preset-rtsp-restream
        roles:
          - record
          - detect
  detect:
    enabled: true
    width: 480
    height: 640
    fps: 6
  motion:
    threshold: 30
    contour_area: 10
    improve_contrast: false
  live:
    streams:
      Thermal Stream: front_door_thermal
  ui:
    dashboard: false
  birdseye:
    enabled: false

# -----------------------------------------------------------------------
# PATIO LOWER — Hikvision 192.168.20.158 | GPU 1 | no audio
# -----------------------------------------------------------------------
patio_lower:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/patio_lower
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/patio_lower_sub
        input_args: preset-rtsp-restream
        roles:
          - detect
  detect:
    enabled: true
    width: 1280
    height: 720
    fps: 5
  motion:
    threshold: 30
    contour_area: 10
    improve_contrast: false
  ui:
    dashboard: true
  birdseye:
    enabled: true
  live:
    streams:
      SD Stream: patio_lower_sub
      HD Stream: patio_lower

# -----------------------------------------------------------------------
# PATIO LOWER THERMAL — Hikvision 192.168.20.158 ch.201 | GPU 1 | no audio
# -----------------------------------------------------------------------
patio_lower_thermal:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/patio_lower_thermal
        input_args: preset-rtsp-restream
        roles:
          - record
          - detect
  detect:
    enabled: true
    width: 640
    height: 480
    fps: 6
  motion:
    threshold: 30
    contour_area: 10
    improve_contrast: false
  live:
    streams:
      Thermal Stream: patio_lower_thermal
  ui:
    dashboard: false
  birdseye:
    enabled: false

# -----------------------------------------------------------------------
# UTILITY WINDOW — Hikvision 192.168.20.151 | GPU 1 | no audio
# -----------------------------------------------------------------------
utility_window:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/utility_window
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/utility_window_sub
        input_args: preset-rtsp-restream
        roles:
          - detect
  detect:
    enabled: true
    width: 1280
    height: 720
    fps: 5
  motion:
    threshold: 30
    contour_area: 10
    improve_contrast: false
  ui:
    dashboard: true
  birdseye:
    enabled: true
  live:
    streams:
      SD Stream: utility_window_sub
      HD Stream: utility_window

# -----------------------------------------------------------------------
# UTILITY WINDOW THERMAL — Hikvision 192.168.20.151 ch.201 | GPU 1 | no audio
# -----------------------------------------------------------------------
utility_window_thermal:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/utility_window_thermal
        input_args: preset-rtsp-restream
        roles:
          - record
          - detect
  detect:
    enabled: true
    width: 640
    height: 480
    fps: 6
  motion:
    threshold: 30
    contour_area: 10
    improve_contrast: false
  live:
    streams:
      Thermal Stream: utility_window_thermal
  ui:
    dashboard: false
  birdseye:
    enabled: false

# -----------------------------------------------------------------------
# COMPOST BIN — Hikvision 192.168.20.76 | GPU 1 | no audio
# -----------------------------------------------------------------------
compost_bin:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/compost_bin
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/compost_bin_sub
        input_args: preset-rtsp-restream
        roles:
          - detect
  detect:
    enabled: true
    width: 1280
    height: 720
    fps: 5
  motion:
    threshold: 45
    contour_area: 25
    improve_contrast: false
  ui:
    dashboard: true
  birdseye:
    enabled: true
  live:
    streams:
      SD Stream: compost_bin_sub
      HD Stream: compost_bin

# -----------------------------------------------------------------------
# COMPOST BIN THERMAL — Hikvision 192.168.20.76 ch.201 | GPU 1 | no audio
# -----------------------------------------------------------------------
compost_bin_thermal:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/compost_bin_thermal
        input_args: preset-rtsp-restream
        roles:
          - record
          - detect
  detect:
    enabled: true
    width: 640
    height: 480
    fps: 6
  motion:
    threshold: 30
    contour_area: 10
    improve_contrast: false
  live:
    streams:
      Thermal Stream: compost_bin_thermal
  ui:
    dashboard: false
  birdseye:
    enabled: false

# -----------------------------------------------------------------------
# GARDEN FIXED — Axis 192.168.20.66 | GPU 1 | no audio
# -----------------------------------------------------------------------
garden_fixed:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/garden_fixed
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/garden_fixed_sub
        input_args: preset-rtsp-restream
        roles:
          - detect
  detect:
    enabled: true
    width: 1280
    height: 960
    fps: 5
  motion:
    threshold: 45
    contour_area: 25
    improve_contrast: false
  ui:
    dashboard: true
  birdseye:
    enabled: true
  live:
    streams:
      SD Stream: garden_fixed_sub
      HD Stream: garden_fixed

# -----------------------------------------------------------------------
# BACK DOOR — Axis 192.168.20.54 | GPU 1 | no audio
# -----------------------------------------------------------------------
back_door:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/back_door
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/back_door_sub
        input_args: preset-rtsp-restream
        roles:
          - detect
  detect:
    enabled: true
    width: 1024
    height: 768
    fps: 5
  motion:
    threshold: 35
    contour_area: 20
    improve_contrast: false
  ui:
    dashboard: true
  birdseye:
    enabled: true
  live:
    streams:
      SD Stream: back_door_sub
      HD Stream: back_door

# -----------------------------------------------------------------------
# BIRDBOX — Axis M1065-L 192.168.20.65 | GPU 1 | no rotation | audio
# -----------------------------------------------------------------------
birdbox:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/birdbox
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/birdbox_sub
        input_args: preset-rtsp-restream
        roles:
          - detect
    output_args:
      # audio: AAC 48 kHz 64k — camera native 16 kHz is silently dropped by iOS
      record: -f segment -segment_time 10 -segment_format mp4 
        -reset_timestamps 1 -strftime 1 -c:v copy -c:a aac -ar 48000 -b:a 64k
  detect:
    enabled: true
    width: 1280
    height: 720
    fps: 10
  motion:
    threshold: 35
    contour_area: 20
    improve_contrast: false
    mask: 0.768,0.087,0.85,0,1,0,1,1,0.765,1
  ui:
    dashboard: true
  birdseye:
    enabled: true
  live:
    streams:
      SD Stream: birdbox_sub
      HD Stream: birdbox

# -----------------------------------------------------------------------
# PATIO — Axis Q1645 192.168.20.64 | GPU 1 | no rotation | audio
# -----------------------------------------------------------------------
patio:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/patio
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/patio_sub
        input_args: preset-rtsp-restream
        roles:
          - detect
    output_args:
      # audio: AAC 48 kHz native — copy directly, no resample needed
      record: preset-record-generic-audio-copy
  detect:
    enabled: true
    width: 1280
    height: 720
    fps: 5
  motion:
    threshold: 35
    contour_area: 15
    improve_contrast: false
    mask:
      - 0.242,0.877,0.226,0.059,0.068,0.046,0.067,0,0.273,0,0.323,0.432,0.369,0.418,0.344,0.253,0.386,0.251,0.447,0.442,0.526,0.651,0.659,0.675,0.652,0.784
      - 1,0.191,1,0,0.662,0,0.645,0.016,0.643,0.034,0.701,0.032,0.97,0.247,1,0.503,0.93,0.493,0.928,0.609,0.85,0.605,0.851,1,1,1
  ui:
    dashboard: true
  birdseye:
    enabled: true
  live:
    streams:
      SD Stream: patio_sub
      HD Stream: patio

# -----------------------------------------------------------------------
# DAHUA TEST — 192.168.20.150 | GPU 0 | TEST ONLY — remove when done
# -----------------------------------------------------------------------
dahua_test:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 0
    inputs:
      - path: rtsp://127.0.0.1:8554/dahua_test
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/dahua_test_sub
        input_args: preset-rtsp-restream
        roles:
          - detect
  detect:
    enabled: true
    width: 2000
    height: 1500
    fps: 10
  motion:
    threshold: 30
    contour_area: 10
    improve_contrast: false
  ui:
    dashboard: true
  birdseye:
    enabled: true
  live:
    streams:
      Record Stream: dahua_test
      Detect Stream: dahua_test_sub

# -----------------------------------------------------------------------
# HALLWAY — Axis M1065-L 192.168.20.56 | GPU 1 | no rotation | no audio
# -----------------------------------------------------------------------
hallway:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/hallway
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/hallway_sub
        input_args: preset-rtsp-restream
        roles:
          - detect
#[AUDIO_DISABLED]      output_args:
#[AUDIO_DISABLED]        # audio: AAC 48 kHz 64k — camera native 16 kHz is silently dropped by iOS
#[AUDIO_DISABLED]        record: -f segment -segment_time 10 -segment_format mp4 
#[AUDIO_DISABLED]          -reset_timestamps 1 -strftime 1 -c:v copy -c:a aac -ar 48000 -b:a 64k
  detect:
    enabled: true
    width: 1280
    height: 720
    fps: 5
  ui:
    dashboard: false
  birdseye:
    enabled: false
  motion:
    threshold: 35
    contour_area: 20
    improve_contrast: false
  review:
    alerts:
      labels: []        # no alerts from indoor cameras
      cutoff_time: 40   # default
    detections:
      labels:
        - person
        - cat
        - dog
      cutoff_time: 30   # default
  live:
    streams:
      SD Stream: hallway_sub
      HD Stream: hallway

# -----------------------------------------------------------------------
# KITCHEN — Axis M1065-L 192.168.20.57 | GPU 1 | no rotation | no audio
# -----------------------------------------------------------------------
kitchen:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/kitchen
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/kitchen_sub
        input_args: preset-rtsp-restream
        roles:
          - detect
#[AUDIO_DISABLED]      output_args:
#[AUDIO_DISABLED]        # audio: AAC 48 kHz 64k — camera native 16 kHz is silently dropped by iOS
#[AUDIO_DISABLED]        record: -f segment -segment_time 10 -segment_format mp4 
#[AUDIO_DISABLED]          -reset_timestamps 1 -strftime 1 -c:v copy -c:a aac -ar 48000 -b:a 64k
  detect:
    enabled: true
    width: 1280
    height: 720
    fps: 5
  ui:
    dashboard: false
  birdseye:
    enabled: false
  motion:
    threshold: 35
    contour_area: 20
    improve_contrast: false
  review:
    alerts:
      labels: []        # no alerts from indoor cameras
      cutoff_time: 40   # default
    detections:
      labels:
        - person
        - cat
        - dog
      cutoff_time: 30   # default
  live:
    streams:
      SD Stream: kitchen_sub
      HD Stream: kitchen

# -----------------------------------------------------------------------
# LANDING — Axis M1065-L 192.168.20.68 | GPU 1 | no rotation | no audio
# -----------------------------------------------------------------------
landing:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/landing
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/landing_sub
        input_args: preset-rtsp-restream
        roles:
          - detect
#[AUDIO_DISABLED]      output_args:
#[AUDIO_DISABLED]        # audio: AAC 48 kHz 64k — camera native 16 kHz is silently dropped by iOS
#[AUDIO_DISABLED]        record: -f segment -segment_time 10 -segment_format mp4 
#[AUDIO_DISABLED]          -reset_timestamps 1 -strftime 1 -c:v copy -c:a aac -ar 48000 -b:a 64k
  detect:
    enabled: true
    width: 1280
    height: 720
    fps: 5
  ui:
    dashboard: false
  birdseye:
    enabled: false
  motion:
    threshold: 35
    contour_area: 20
    improve_contrast: false
  review:
    alerts:
      labels: []        # no alerts from indoor cameras
      cutoff_time: 40   # default
    detections:
      labels:
        - person
        - cat
        - dog
      cutoff_time: 30   # default
  live:
    streams:
      SD Stream: landing_sub
      HD Stream: landing

# -----------------------------------------------------------------------
# GARAGE INTERNAL — Axis M1065-L 192.168.20.73 | GPU 1 | no rotation | audio
# -----------------------------------------------------------------------
garage_internal:
  enabled: true
  ffmpeg:
    hwaccel_args: preset-nvidia
    gpu: 1
    inputs:
      - path: rtsp://127.0.0.1:8554/garage_internal
        input_args: preset-rtsp-restream
        roles:
          - record
      - path: rtsp://127.0.0.1:8554/garage_internal_sub
        input_args: preset-rtsp-restream
        roles:
          - detect
    output_args:
      # audio: AAC 48 kHz 64k — camera native 16 kHz is silently dropped by iOS
      record: -f segment -segment_time 10 -segment_format mp4 
        -reset_timestamps 1 -strftime 1 -c:v copy -c:a aac -ar 48000 -b:a 64k
  detect:
    enabled: true
    width: 1280
    height: 720
    fps: 5
  motion:
    threshold: 35
    contour_area: 20
    improve_contrast: false
  ui:
    dashboard: true
  birdseye:
    enabled: true
  live:
    streams:
      SD Stream: garage_internal_sub
      HD Stream: garage_internal

camera_groups:
Birdseye:
  order: 1
  icon: LuBird
  cameras:
    - birdseye
Front_Garden:
  order: 2
  icon: LuCar
  cameras:
    - axis_intercom
    - front_door
    - back_door
    - garage_internal
Back_Garden:
  order: 3
  icon: LuTreeDeciduous
  cameras:
    - patio_lower
    - patio
    - compost_bin
    - garden_fixed
    - birdbox
    - back_door
    - utility_window
Thermal:
  order: 4
  icon: LuThermometer
  cameras:
    - front_door_thermal
    - patio_lower_thermal
    - compost_bin_thermal
    - utility_window_thermal
Indoor:
  order: 5
  icon: LuHouse
  cameras:
    - hallway
    - kitchen
    - landing
semantic_search:
enabled: true
model_size: large
face_recognition:
enabled: true
model_size: small
lpr:
enabled: false
classification:
bird:
  enabled: false

docker-compose file or Docker CLI command

services:
  frigate:
    container_name: frigate
    privileged: true
    restart: unless-stopped
    stop_grace_period: 45s
    image: ghcr.io/blakeblackshear/frigate:0.17.1-tensorrt
    runtime: nvidia
    shm_size: "2048mb"
    devices:
      - /dev/nvidia0:/dev/nvidia0
      - /dev/nvidiactl:/dev/nvidiactl
      - /dev/nvidia-modeset:/dev/nvidia-modeset
      - /dev/nvidia-uvm:/dev/nvidia-uvm
      - /dev/nvidia-uvm-tools:/dev/nvidia-uvm-tools
    volumes:
      - /etc/localtime:/etc/localtime:ro
      - /opt/frigate/config:/config
      - /mnt/frigate_storage:/media/frigate
      - /etc/letsencrypt/live/frigate.domain.com:/etc/letsencrypt/live/frigate:ro
      - /etc/letsencrypt/archive/frigate.domain.com:/etc/letsencrypt/archive/frigate.domain.com:ro
      - type: tmpfs
        target: /tmp/cache
        tmpfs:
          size: 4000000000
    ports:
      - "8971:8971"      # Still available for local authenticated access
      - "8554:8554"      # RTSP feeds
      - "8555:8555/tcp"  # WebRTC
      - "8555:8555/udp"  # WebRTC
      - "1984:1984"      # go2rtc
      - "5000:5000"
    environment:
      FRIGATE_CAMLOGIN: ${CAMLOGIN}
      NVIDIA_VISIBLE_DEVICES: all
      NVIDIA_DRIVER_CAPABILITIES: compute,utility,video
      PLUS_API_KEY: ${FRIGATEPLUSKEY}
      GO2RTC_ALLOW_ARBITRARY_EXEC: true

    deploy:
      resources:
        reservations:
          devices:
            - driver: nvidia
              count: 2
              capabilities: [gpu]

Relevant Frigate log output

[2026-03-23 04:00:00] frigate.output.preview  ERROR: Error saving preview for patio_lower ::
    [in#0 @ 0x55a87046ee00] Error opening input: Invalid data found when processing input
    Error opening input file /dev/stdin.
    Error opening input files: Invalid data found when processing input

  Frigate process was restarted by s6 at 03:34:55 UTC. The hour boundary triggered
  FFMpegConverter at 04:00:00 UTC. All other cameras (including front_door, patio,
  etc.) produced previews successfully for the same window; only patio_lower — which has
  a companion camera patio_lower_thermal sharing its name as a prefix — failed.

Relevant go2rtc log output

na

Operating system

Debian

Install method

Docker Compose

Network connection

Wired

Camera make and model

Hikvision

Screenshots of the Frigate UI's System metrics pages

na

Any other information that may be helpful

Environment

• Frigate version: 0.17.1-416a9b7
• Install method: Docker container with s6 process supervisor
• Preview cache: Docker tmpfs at /tmp/cache (4 GB, persists across s6 restarts,
  cleared on full Docker container restart)
• Affected cameras: Any pair where one camera name is a prefix of another — most
  commonly the built-in _thermal naming convention (e.g. patio_lower +
  patio_lower_thermal)
• GPU: Nvidia Tesla V100 (not relevant to this bug — preview encoding uses software
  libx264 regardless of hwaccel config)

[inkeep-ai-assistant[bot]]

This is a valid bug report identifying a prefix-matching issue in PreviewRecorder.__init__ that causes preview generation to fail when one camera name is a prefix of another (e.g., patio_lower and patio_lower_thermal).

The root cause analysis is accurate: the code uses file.startswith(file_start) where file_start is constructed as f"preview_{config.name}" without a trailing delimiter. This causes "preview_patio_lower_thermal-xxx.webp" to incorrectly match when scanning for patio_lower frames, loading phantom timestamps that reference non-existent files for the wrong camera.

The proposed fix—appending "-" to the startswith check—is the correct solution:

# Before
if not file.startswith(file_start):

# After  
if not file.startswith(file_start + "-"):

This ensures exact camera name matching:

• "preview_patio_lower_thermal-xxx.webp".startswith("preview_patio_lower-") → False ✓
• "preview_patio_lower-xxx.webp".startswith("preview_patio_lower-") → True ✓

A similar issue with preview frame cache restoration across filesystem boundaries was discussed in a GitHub discussion, where the shutil.move operation between tmpfs and persistent storage caused blocking behavior.(1) While that discussion focused on cross-filesystem moves rather than prefix matching, it highlights that the preview cache restoration path has been a source of issues.

This bug affects any deployment using Frigate's _thermal naming convention or similar prefix-based camera naming where the preview cache persists across s6 process restarts.

📚 Sources:

1. "No Preview Found" started appearing since yesterday morning

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Have another question? Just tag @inkeep.

[hawkeye217]

This has been improved in #22594