Convert videos using ffmpeg by ffmpeg_paperclip-Rails

Recently i implemented video uploads at S3 using ffmpeg-paperclip and ffmpeg where my uploaded videos get converted into mp4,webm and ogg(most required formats) along with 2 screenshots(with diff sizes) and stored at S3.
its so wonderful in many ways:-

1. your uploaded videos get converted into required formats(compatible on all browsers) before saving using ffmpeg through ffmpeg-paperclip
2. moreover,you will also get screenshot(2 different images)of every video uploaded + AMAZON S3(you can even store locally,refer Paperclip)
3. if you want the background job to process video conversion then,use delayed_paperclip 

i will show you how you can convert your uploaded videos into required formats and why we need to convert ....well refer this .Before starting make sure that you have ffpmeg installed with all libraries needed,so click the above link instead of searching for how to install ffmpeg and install it(will take around 30mins.but its worthy).

Here i am using mediaelement.js and Rails 3.2.13

The below code is expecting that:

1. you have a working upload using paperclip(usually 3.5.1)
2. Amazon s3 configured,if not then view my recent post to configure S3 on rails
3. you must have ffmpeg installed 

my Gemfile looks like this:

gem 'paperclip', '3.5.1'
gem "aws-sdk"

gem "paperclip-ffmpeg"

gem 'delayed_paperclip'

video.rb(convert to mp4,webm and ogg with two screenshots )

class Video < ActiveRecord::Base
  default_scope order: 'created_at DESC'
  has_attached_file :source,
  :default_url => '/dashboard/default_avatar.jpg',
  :styles => {
      :mp4video => { :geometry => '520x390', :format => 'mp4',
        :convert_options => { :output => { :vcodec => 'libx264',
          :vpre => 'ipod640', :b => '250k', :bt => '50k',
          :acodec => 'libfaac', :ab => '56k', :ac => 2 } } },
      :oggvideo => { :geometry => '520x390', :format => 'ogg',
        :convert_options => { :output => { :vcodec => 'libtheora',
          :b => '250k', :bt => '50k', :acodec => 'libvorbis',
          :ab => '56k', :ac => 2 } } },
      :webmvideo => { :geometry => '520x390', :format => 'webm',
      :convert_options => { :output => { :vcodec => 'libvpx',
        :b => '250k', :bt => '50k', :acodec => 'libvorbis',
        :ab => '56k', :ac => 2 } } },  
      :view => { :geometry => '520x390', :format => 'jpg', :time => 2 },
      :preview => { :geometry => '160x120', :format => 'jpg', :time => 2 }
    },
    processors: [:ffmpeg],
    :max_size => 300.megabytes, 
    :storage => :s3,
    :s3_credentials => S3_CREDENTIALS

  ##here comes delayed video processing using delayed_papeclip

  process_in_background :source , :processing_image_url => "/images/loading.gif" 

if you want to use default styles as let FFMPEG decide the best specifications for the videos to convert,then you can just use:-


 :styles => {
    :mp4video => { :geometry => "640x480", :format => 'mp4', :convert_options => {:output => {:ar => 44100}} },
    :webmvideo =>{ :geometry => "1024x576", :format => 'webm', :convert_options => {:output => {:ar => 44100}} },
    :oggvideo => { :geometry => "1024x576", :format => 'ogg', :convert_options => {:output => {:ar => 44100}} }
  }

Access the uploaded video:-

1. video.source.url-gives original uploaded video
2. video.source.url(:mp4video)-gives uploaded video in mp4
3. video.source.url(:small)-gives uploaded video screenshot(for poster attribute in video_tag)