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ffmpeg -i test.mp3 -vn -acodec libvorbis test.ogg

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# oj gem
gem 'oj'
gem 'oj_mimic_json' # we need this for Rails 4.1.x

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-- This queries were tested on PostgreSQL 9.3.4

-- Provides detailed information about servers current connections
SELECT  datname as database, 
        pid, 
        user as username, 
        application_name as application, 
        client_addr as client_address, 
        query 
  FROM pg_stat_activity;

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-- Show biggest tables in your database
SELECT nspname || '.' || relname AS "relation",
    pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
  FROM pg_class C
  LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
  WHERE nspname NOT IN ('pg_catalog', 'information_schema')
    AND C.relkind <> 'i'
    AND nspname !~ '^pg_toast'
  ORDER BY pg_total_relation_size(C.oid) DESC
  LIMIT 20;

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# Позволяет получить общую картину: распределение уникальных IP, с которых идут запросы, кол-во запросов с одного IP и т.д.
tail -f /var/log/nginx/nginx.access.log | cut -d ' ' -f 1 | logtop

# Покажет распределение какой-либо строки по IP в логе. 
grep "&key=" /var/log/nginx/nginx.access.log | cut -d ' ' -f 1 | sort | uniq -c | sort -n | tail -n 30

# С какого ip сколько запросов
netstat -ntu | awk '{print $5}'| cut -d: -f1 | sort | uniq -c | sort -nr | more

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# params: $input, $output, $width, $height, $color

# for landscape (normal) orientation
ffmpeg -y -i $input -vcodec flv1 -vf "scale=iw*min($width/iw\,$height/ih):ih*min($width/iw\,$height/ih), pad=$width:$height:($width-iw*min($width/iw\,$height/ih))/2:($height-ih*min($width/iw\,$height/ih))/2:color=$color" -vb 4000k -acodec mp3 -ar 44100 -ab 320k -vsync 1 -async 1 $output

# for portrait orientation
ffmpeg -y -i $input -vcodec flv1 -vf "transpose=1, scale=iw*min($width/iw\,$height/ih):ih*min($width/iw\,$height/ih), pad=$width:$height:($width-iw*min($width/iw\,$height/ih))/2:($height-ih*min($width/iw\,$height/ih))/2:color=$color" -vb 4000k -acodec mp3 -ar 44100 -ab 320k -vsync 1 -async 1 $output

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# config/routes.rb
resources :documents do
  scope module: 'documents' do
    resources :versions do
      post :restore, on: :member
    end

    resource :lock
  end
end

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$primary-color: #1B1B1B;
$text-color: #333;
$link-color: #08C;

$current-menu-item-background: $primary-color;
$hover-menu-item-background: $primary-color;

$secondary-gradient-start: #F7F7F9;
$secondary-gradient-stop: #F7F7F9;

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require 'rubygems'
require 'eventmachine'

module ChatClient
  def self.list
    @list ||= []
  end

  def post_init
    @name = "anonymous_#{rand(99999)}"

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# A sample Gemfile
source "http://rubygems.org"

 gem "redis"
 gem 'eventmachine', :git => 'git://github.com/eventmachine/eventmachine.git'
 gem "em-hiredis"
 # gem "em-synchrony"
 gem "em-websocket"