blinkvault 0.1.4

Local motion capture for Blink cameras — no subscription, 30s pre-roll, in-memory buffer

blinkvault

Local motion capture and livestreaming for Blink cameras — no subscription required.

blinkvault keeps a continuous live stream from your Blink camera in memory, detects motion locally using frame differencing, and saves MP4 clips that include up to 30 seconds of footage before the motion event. Everything runs on your own machine. No Blink subscription, no cloud clip storage, no always-on disk writes.

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Why this is different

Every other Blink integration works the same way: poll Blink's cloud API every 30 seconds, wait for a new clip to appear, download it. This means you need a paid Blink subscription, you get ~30 second delays, and you only see footage after motion triggers — never before.

blinkvault takes a different approach:

	blinkvault	blinkbridge / HA integration
Blink subscription required	No	Yes (for clip history)
Motion detection	Local, frame-by-frame	Cloud polling
Pre-roll footage	Up to 30 seconds	None
Latency	Real-time	30+ second delay
Disk I/O at rest	None (RAM buffer)	Constant segment writes
Setup complexity	Single Python script	Docker / Home Assistant

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How it works

Live stream via the IMMI protocol

Blink cameras do not expose RTSP. blinkvault uses blinkpy's BlinkLiveStream class to speak Blink's proprietary IMMI protocol — a TLS-wrapped binary protocol that delivers a real MPEG-TS stream. We patch two bugs in blinkpy's implementation (partial reads in recv() and over-eager poll termination) to keep the stream stable.

In-memory rolling buffer

A dedicated ffmpeg process reads raw MPEG-TS data from the local proxy and feeds it into a Python collections.deque — a rolling ~45 MB window of timestamped byte chunks. Nothing is written to disk while the camera is idle.

Local motion detection

A second ffmpeg process decodes the stream at 2 fps and downscales to 320×180 grayscale. Python computes the mean absolute pixel difference between consecutive frames using numpy. When the difference exceeds a configurable threshold, motion is declared. No cloud, no ML model, no subscription.

Pre-roll clips

When motion fires, the in-memory buffer already contains the last 30 seconds of footage. blinkvault slices the relevant byte range, writes a single temporary .ts file, and converts it to a clean MP4 with ffmpeg. The resulting clip starts before the motion event — you see the person walking up to the door, not just the moment they arrived.

Auto-reconnect

Blink sessions time out after approximately 5 minutes. blinkvault detects stream termination and reconnects automatically, maintaining continuous monitoring.

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Requirements

• Python 3.11+
• ffmpeg (must be on $PATH)
• A Blink account with a compatible camera (tested on Blink Video Doorbell)

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Installation

From PyPI:

pip install blinkvault

From source:

git clone https://github.com/karl-dykema/blinkvault
cd blinkvault
python3 -m venv venv
source venv/bin/activate
pip install -e .

Requires ffmpeg on your $PATH. macOS: brew install ffmpeg

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Web interface

blinkvault

Or if running from source:

python app.py

Open http://localhost:8080 in your browser.

On first run you will be prompted for your Blink email, password, and a two-factor authentication code. Credentials are saved to creds.json (gitignored) and reused on subsequent runs.

Features

• Start / Stop the monitoring daemon
• Record Now — grab a clip on demand without waiting for motion
• Motion sensitivity — tune the frame-diff threshold (lower = more sensitive)
• Cooldown — minimum seconds between consecutive motion triggers
• Clip duration — how many seconds of post-motion footage to include
• Clip browser — collapsible list with formatted timestamps, file sizes, inline playback and download

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CLI livestream

# Watch live in a player
blinkvault-stream --output - | ffplay -

# Record to file
blinkvault-stream --output recording.mp4

# Stream to UDP (e.g. for VLC or Frigate)
blinkvault-stream --output udp://127.0.0.1:1234

# Pick a specific camera by name
blinkvault-stream --camera "Front Door" --output recording.mp4

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Configuration

Settings are saved to capture_config.json (gitignored) via the web UI, or you can edit the file directly:

{
  "clip_duration": 30,
  "camera_name": "",
  "motion_threshold": 10,
  "cooldown": 60
}

Key	Default	Description
clip_duration	30	Seconds of post-motion footage per clip
camera_name	""	Camera name as shown in the Blink app. Leave blank to use the first camera found.
motion_threshold	10	Mean pixel difference to declare motion (1–50). Lower is more sensitive.
cooldown	60	Minimum seconds between motion triggers

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Privacy note

creds.json contains your Blink access token. It is gitignored and never leaves your machine. Clips and config are also gitignored.

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Acknowledgements

• blinkpy by Kevin Fronczak — Python API library for Blink cameras. blinkvault is built on top of blinkpy for authentication, camera discovery, and the BlinkLiveStream IMMI protocol implementation.
• FFmpeg — used for stream demuxing, grayscale frame extraction, motion analysis, and MP4 encoding.
• FastAPI — web framework powering the local UI.
• numpy — frame differencing for local motion detection.

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License

GPL-3.0 — see LICENSE