Videoreg: script for continuous video recording from the plugged webcams

Prerequisites: you will need to install the required libraries

RabbitMQ and Ruby are required to use this script.

sudo echo "deb http://www.rabbitmq.com/debian/ testing main" >> /etc/apt/sources.list
sudo wget http://www.rabbitmq.com/rabbitmq-signing-key-public.asc
sudo apt-key add rabbitmq-signing-key-public.asc
sudo apt-get update
apt-get install -y mencoder ffmpeg qc-usb-utils v4l-utils rabbitmq-server ruby1.9.1 rubygems ruby1.9.1-dev

Then write the configuration file according to your setup:

    reg {
      device      '/dev/webcam0'
      resolution  '640x480'
      fps         25
      duration    60
      filename    '#{time}-webcam0.avi'
      storage     '/tmp/webcam0'
      lockfile    '/tmp/videoreg.webcam0.lock'
      store_max   5
    }

    reg {
      device      '/dev/webcam1'
      resolution  '640x480'
      fps         25
      duration    60
      filename    '#{time}-webcam1.avi'
      storage     '/tmp/webcam1'
      lockfile    '/tmp/videoreg.webcam1.lock'
      store_max   3
    }

    reg {
      device      '/dev/webcam2'
      resolution  '640x480'
      fps         25
      duration    60
      filename    '#{time}-webcam2.avi'
      storage     '/tmp/webcam2'
      lockfile    '/tmp/videoreg.webcam2.lock'
      store_max   3
    }

    log_path    '/tmp/videoreg.log'
    pid_path    '/tmp/videoreg.pid'
    mq_queue    'com.ifree.videoreg.daemon'
    mq_host     'localhost'

After the installation you are able to manage the process using 'videoreg' command:

    $ videoreg -h
    Usage: videoreg [options]
        -c, --config CONFIG              Use the specified config
        -d, --device DEVICE              Run only the specified device
        -H, --halt DEVICE                Halt (SIGKILL) recording process
        -P, --pause DEVICE               Pause (SIGSTOP) recording process
        -R, --resume DEVICE              Resume (SIGCONT) recording process
        -r, --recover DEVICE             Recover the recording process
        -p, --pid PID                    Set the PID file for the capture process
        -l, --log LOGFILE                Set the logfile for daemon
        -e, --ensure                     Check the state of the daemon
        -C, --clear                      Clear the state (remove lock-files)
        -k, --kill                       Kills the capture processes
        -v, --version                    Show the version
        -h, --help                       Show this help message
        -U, --udev                       Generate udev rules for current config
        -I, --info                       Show info about plugged devices

To get the current daemon status:

    $  videoreg -c config.rb -e
    Running command 'ensure' for device(s): 'all'...
    DAEMON:          [RUNNING]
    Uptime:          4sec
    /dev/webcam0:    [RUNNING]
    /dev/webcam1:    [RUNNING]
    /dev/webcam2:    [NO DEVICE]

To run the daemon:

    $ videoreg -c config.rb
    Daemon has started successfully

To stop the daemon:

    $ videoreg -c config.rb --k
    Stopped PID: 3870 at /tmp/videoreg.pid

To stop recording from the specified device:

    $ videoreg -c config.rb -H /dev/webcam0
    Running command 'halt' for device(s): '/dev/webcam0'...
    I, [2012-07-03T14:00:35.802428 #8115]  INFO -- : Publish message to RabbitMQ 'HALT' with arg '/dev/webcam0' to 'com.ifree.videoreg.daemon'...
    I, [2012-07-03T14:00:36.347704 #8115]  INFO -- : Disconnecting from RabbitMQ...

    $ videoreg -c config.rb -e
    Running command 'ensure' for device(s): 'all'...
    DAEMON:          [RUNNING]
    Uptime:          1min 18sec
    /dev/webcam0:    [NOT RUNNING]
    /dev/webcam1:    [RUNNING]
    /dev/webcam2:    [NO DEVICE]

To run recording from the specified device:

    $ videoreg -c config.rb -r /dev/webcam0
    Running command 'recover' for device(s): '/dev/webcam0'...
    I, [2012-07-03T14:02:12.375352 #8193]  INFO -- : Publish message to RabbitMQ 'RECOVER' with arg '/dev/webcam0' to 'com.ifree.videoreg.daemon'...
    I, [2012-07-03T14:02:12.920787 #8193]  INFO -- : Disconnecting from RabbitMQ...

    $ videoreg -c config.rb -e
    Running command 'ensure' for device(s): 'all'...
    DAEMON:          [RUNNING]
    Uptime:          2min 34sec
    /dev/webcam0:    [RUNNING]
    /dev/webcam1:    [RUNNING]
    /dev/webcam2:    [NO DEVICE]

To pause the device:

    $ videoreg -c config.rb -P /dev/webcam0
    Running command 'pause' for device(s): '/dev/webcam0'...
    I, [2012-07-03T14:03:28.840693 #8254]  INFO -- : Publish message to RabbitMQ 'PAUSE' with arg '/dev/webcam0' to 'com.ifree.videoreg.daemon'...
    I, [2012-07-03T14:03:29.386111 #8254]  INFO -- : Disconnecting from RabbitMQ...

    $ videoreg -c config.rb -e
    Running command 'ensure' for device(s): 'all'...
    DAEMON:          [RUNNING]
    Uptime:          3min 50sec
    /dev/webcam0:    [PAUSED]
    /dev/webcam1:    [RUNNING]
    /dev/webcam2:    [NO DEVICE]

To resume the device:

    $ videoreg -c config.rb -R /dev/webcam0
    Running command 'resume' for device(s): '/dev/webcam0'...
    I, [2012-07-03T14:04:34.870130 #8308]  INFO -- : Publish message to RabbitMQ 'RESUME' with arg '/dev/webcam0' to 'com.ifree.videoreg.daemon'...
    I, [2012-07-03T14:04:35.415852 #8308]  INFO -- : Disconnecting from RabbitMQ...

    $ videoreg -c config.rb -e
    Running command 'ensure' for device(s): 'all'...
    DAEMON:          [RUNNING]
    Uptime:          4min 58sec
    /dev/webcam0:    [RUNNING]
    /dev/webcam1:    [RUNNING]
    /dev/webcam2:    [NO DEVICE]

Get the information about the plugged webcams:

    $ videoreg -I
    usb1[1-1] --> /dev/webcam0
    usb2[2-1] --> /dev/webcam1

To generate the udev rules file (create the user-friendly symlinks to the webcam devices):

    $ videoreg -U
    Writing the rules to /etc/udev/rules.d/50-udev-videoreg.rules file:
                BUS=="usb" ACTION=="add" DEVPATH=="/devices/pci0000:00/0000:00:1a.0/usb1/1-1/*/video4linux/video*" SYMLINK+="webcam0" GROUP="video"
                BUS=="usb" ACTION=="add" DEVPATH=="/devices/pci0000:00/0000:00:1d.0/usb2/2-1/*/video4linux/video*" SYMLINK+="webcam1" GROUP="video"
    File has been written successfully! Now restart udev (/etc/init.d/udev restart) and replug the webcams!

Changelog

03.07.2012

Current status

Реализация правил udev (добавление симлинков на девайсы по определённым правилам)

29.06.2012

Current status

Проверка наличия всех девайсов (камер)
По команде прервать запись с определенной камеры и начать заново (это нужно чтобы вытащить кадр из текущего кусочка записи)
"Ленивая" инициализация заданной камеры: пауза/запуск процесса записи

28.06.2012

Current status

Запуск видеозаписи
- Параметры для всех камер хранятся в одном конфиге (разрешение, фпс, длительность каждого файла)
- Запись по кускам (по 10минут в один файл например)
- Слежение

TODO

Состояние системы (свободное место на винте, время работы с момента последней перезагрузки и тп) – тоже в конфиге как-то хранить
Слежение за свободным местом на диске (например записи с камер 1 и 2 должны хранится 12 часов, но все вместе не более 15Гб)
Алерты об ошибках в Приложение1
Запуск Приложения3 – при появлении файлов с определенной камеры надо запускать нашу программку (Приложение2), потом файлик удалять (или не удалять – параметр в конфиге)