homebridge-snapshot-to-camera

homebridge-snapshot-to-camera

Homebridge plugin for displaying a Snapshot Image as Camera

This is folk code from https://github.com/werthdavid/homebridge-website-to-camera (Thank David Werth)

Installation

Make sure you have Homebridge installed.

1. Install this plugin using: sudo npm install -g homebridge-snapshot-to-camera
2. Update your Homebridge config.json using the sample below (append in the block 'platforms' not 'accessories')

Configuration

Update your config similar to this:

 "platforms": [
      {
         "platform": "snapshot-camera",
         "cameras": [
            {
               "name": "Website 1",
               "url": "https://github.com",
               "digestAuth": {
                  "username": "username",
                  "password": "password"
               }
            }
         ]
      }
   ]

You can add multiple cameras!

Config file

Take a look at the example config.json

Fields:

• name name of the camera (required)
• id unique(!) identifier for that specific camera (optional)
• url the URL of the website that is to be captured (required)
• scale HomeApp requests a (device dependent) size for the preview-image. With e.g. scale set to 2 (default) the virtual browser window is set to this size. Best is to skip this field.
• OR width / height the width/height of the virtual browser window. This is optional and overrides scale.
• chromiumPath path to chromium-executable (defaults to "/usr/bin/chromium-browser")
• timeout timeout in ms for waiting until the page has no more pending requests. resembles to puppeteer.goto() (defaults to 10000 --> 10s)
• renderTimeout timeout in ms for waiting AFTER the page has loaded before taking the screenshot. userful for PWAs. (defaults to 1ms)
• ignoreHTTPSErrors ignore HTTPS errors, useful for self-signed certificates (defaults to false)
• cacheTime will cache the image for the given time (in seconds) and a new screenshot will be created only if the time since the last screenshot is bigger than the given time
• jsFile specify the full path of a custom JS-file that will be injected to the page (e.g. if you want to hide cookie-banners)
• live enabled live mode to use with ffmpeg plugin (defaults to false). See below!
• liveSnapshotInterval takes a screenshot of the website in the specified interval (in milliseconds). 1000 is a good value to start with.
• liveRefreshInterval how often the page should be reloaded in live-mode (in milliseconds). If live mode is not enabled the page will be opened every time a screenshot is taken so refreshing is not needed.
• livePort when live is set to true, this will be the port where the live server is running (defaults to 8554). make sure you use a free port especially if you have multiple cameras.

Usage

In some cases, the camera is not visible in Home-App:

• Press + on top right corner in Home-App
• Press Add device
• Press Code missing
• Select Camera
• Provide the code from Homebridge startup output (as stated in your config.json)

AppleTV / Live-Stream :tada:

In Homebridge a Camera-Accessory provides two functionalities:

• deliver a "still image" that serves as a preview for the camera
• deliver a live-stream if the camera is "clicked"

In previous versions of the plugin, only the still image was supported. This is a problem for AppleTV as this device does not show the still image, instead it directly shows the live-stream. Implementing the live-stream is not that easy with Node.js (Homekit needs the Camera to connect to the client via SRTP and send the video e.g. with x264). Instead of implementing this directly this plugin implements a helper, that lets you enable live-streaming via the homebridge-camera-ffmpeg plugin.

Enable Live-Stream

:exclamation: You need to install homebridge-camera-ffmpeg as well!

 "platforms": [
      {
         "platform": "snapshot-camera",
         "cameras": [
            {
              "name": "Website 1",
              "url": "https://github.com",
              "live": "true",
              "liveSnapshotInterval": 1000,
              "liveRefreshInterval": 5000,
              "livePort": 8554
            }
         ]
      },
      {
        "platform": "Camera-ffmpeg",
        "cameras": [
            {
                "name": "Website Camera",
                "videoConfig": {
                "source": "-i http://localhost:8554",
                "stillImageSource": "-i http://localhost:8554/still"
                }
            }
        ]
      }
 ]

:grey_exclamation: if live is enabled, the website-to-camera plugin will not expose a camera on its own! There will only be a server listening on the given port that offers a MJPEG live-stream.

Live-mode FPS

If you set liveRefreshInterval to 33, the stream will be served with about 30fps. This will consume CPU accordingly. It does work but I recommend setting it to a value >= 1000 (so one picture per second) as this plugin is not optimized for fast live videos.

Background

The plugin uses Puppeteer/Chrome headless to capture the screenshots. The Browser instance stays open all the time for better performance and less CPU/Mem consumption.