Lightweight NVR: watches folders, transcodes to H.264/MP4, serves a FastAPI web UI.
Project description
Cang (藏) — Minimal Python Network Video Recorder
Cang (藏, cáng, roughly "tsang" with a rising tone) — Chinese for "to store / to archive". Secondary meaning: "hidden", quietly apt for security footage. The name reflects the project's philosophy: cameras do all the clever work; Cang just keeps what they send.
A lightweight NVR that does as little as possible: cameras handle motion detection and object recognition themselves, deposit video clips and snapshot images into a watched folder, and Cang transcodes, indexes, and serves them through a clean web UI grouped by day and hour.
Inspired by LazyNVR, written in Python.
What it does
- Watches
incoming/<camera>/directories for clips deposited by cameras - Transcodes to H.264/MP4 with
-movflags +faststart(browser-seekable) - Indexes clips in SQLite: camera, timestamp, duration, thumbnail
- Serves a FastAPI + Jinja2 web UI: day → hour view, click-to-play
- Keeps clips marked as important; auto-expires the rest after configurable days
- Runs anywhere Python is available; can also be deployed in a container
What it does not do
- No RTSP / live-stream pulling
- No motion detection or object recognition (delegated to cameras)
- No multi-user roles or cloud sync
Status
Late beta — core functionality (Dahua adapter, transcode pipeline, web UI) is working. See the documentation for installation and configuration.
Licence
Copyright (C) 2026 Marvin8
This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
See LICENCE for the full text.
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