Paperclip FFMPEG

Adding video handling to Paperclip via ffmpeg. This gem has been tested under Linux and Mac OS X, YMMV under Windows.

Requirements

FFMPEG must be installed and Paperclip must have access to it. To ensure that it does, on your command line, run which ffmpeg. This will give you the path where ffmpeg is installed. For example, it might return /usr/local/bin/ffmpeg.

Then, in your environment config file, let Paperclip know to look there by adding that directory to its path.

In development mode, you might add this line to config/environments/development.rb):

Paperclip.options[:command_path] = "/usr/local/bin/"

Installation

Include the gem in your Gemfile:

gem "paperclip-ffmpeg"

Quick Start

In your model:

class User < ActiveRecord::Base
  has_attached_file :avatar, :styles => { 
      :medium => { :geometry => "640x480", :format => 'flv' }
      :thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10 }
    }, :processors => [:ffmpeg]
end

This will produce:

1. A transcoded :medium FLV file with the requested dimensions if they will match the aspect ratio of the original file, otherwise, width will be maintained and height will be recalculated to keep the original aspect ration.
2. A screenshot :thumb with the requested dimensions regardless of the aspect ratio.

You may optionally add <attachment>_meta to your model and paperclip-ffmpeg will add information about the processed video.

Streaming Video

When ffmpeg produces mp4 files, it places the moov atom at the end which makes it unstreamable. To handle this, paperclip-ffmpeg includes a processor to run qtfaststart after producing the video file.

In your model:

class Lesson < ActiveRecord::Base
  has_attached_file :video, :styles => {
      :mobile => {:geometry => "400x300", :format => 'mp4', :streaming => true}
  }, :processors => [:ffmpeg, :qtfaststart]
end

See danielgtaylor/qtfaststart for instructions on how to setup qtfaststart.

Normalizing Audio

In your model:

class Lesson < ActiveRecord::Base
  has_attached_file :video, :styles => {
      :release => {:geometry => "400x300", :format => 'mp4', :normalize_audio => true}
  }, :processors => [:ffmpeg]
end

License

Licensed under BSD license.