A collections of scripts to set up your time lapse cam web site quickly. Geared towards setting up traffic cams.
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README.md

Trafficr

A collections of scripts to set up your time lapse web site quickly. Geared towards setting up traffic cams.

alt text

Features

  • Video4Linux based capture of webcam images
  • Configurable image scaling and watermarking
  • Secure frame upload to web site
  • Frame archival

Requirements

  • Linux with Bash installed
  • Video4Linux
  • FFMPEG
  • cURL
  • ImageMagick

Installation

Installing Trafficr is a two-part process. It is assumed that the web cam and the web site where the webcam frames are located are two different servers. Hence, the installation requires setting up the webcam frame capture server and then the website scripts.

Step 1 - Copy files in the web directory to your website and edit config.php to adjust any parameters e.g. how many frames to keep.

Step 2 - Configure a web user for new frame uploads, see the Securing Uploads section below.

Step 3 - Copy files in the capture directory to the server that has your webcam connected and edit config.sh to adjust any parameters.

Step 4 - Create a cron job to upload new frames at scheduled intervals, see the Automating Uploads section below.

The web page will not display frames until it has a full set of frames available. For example if you set totalFiles to 5 in config.php, you will need to have 5 frame files before any frames will be displayed. This can be done by either manually running the trafficr.sh script to upload new frames or waiting until the automatic uploads have uploaded enough frames to the web site.

Scripts

This is a short description of what each of the scripts is used for.

  • capture/ - webcam capture scripts
    • config.sh - capture configuration
    • trafficr.sh - main script to caputure and upload a new frame
    • trafficr_cron.sh - cron wrapper for trafficr.sh
  • web/ - website
    • .htaccess - Apache security configuration
    • config.php - website configuration
    • frame.php - frame delivery, serves frame files
    • newframe.php - new frame uploader
    • index.html - example Trafficr web page
    • trafficr.js - JavaScript frame load and cycle implementation

Securing Uploads

The uploader script tries to authenticate to the web server for an upload. For this to work, the following must be added to the .htaccess file on your web site (assuming Apache is your web server).

<FilesMatch "newframe\.php|frame.*\.jpeg">
AuthName "Authorised Access"
AuthType Basic
AuthUserFile /path/to/.htpasswd
require valid-user
</FilesMatch>

You will also need to create a .htpasswd file that stores the user and password used to authenticate. Use the absolute path to this file in the AuthUserFile directive and keep that file outside the web server document root directory.

After that is set up, create a htpasswd.txt file in the same directory as traffic_cam.sh on your webcam server with cURL compatible authentication details e.g.

user:password

Automating Uploads

Set up a cron job to automate capture and upload of new frames to your web site. Below is a sample configuration for the cron wrapper script. Make sure you edit this script with absolute paths pointing to your Trafficr directory.

*/2 * * * * /mnt/Stage1/TrafficCam/trafficr_cron.sh

Archived Frames

Every frame that is captured is also archived (without any watermarking) in the archiving directory (Archive by default). The frames are stored in subdirectories split up by year, month and day.

The archive directory will have a structure like this:

Archive
|
+-- 2016
|   |
|   +-- 09
|   |   |
|   |   +-- 18
|   |   |   |
|   |   |   +-- arch_20160918133805.jpeg
|   |   |   +-- ...
|   |   |   +-- arch_20160918150405.jpeg
|   |   |   +-- ...
|   |   +-- 19
...