Validate Video with his length using paperclip in rails

1. Download ffmpeg on mac.

http://www.renevolution.com/how-to-install-ffmpeg-on-mac-os-x/

2. Run ‘which ffmpeg’ on console. It will show the path if it is saved or not.

3. Now write  ‘ gem "paperclip-ffmpeg" ’ in Gemfile.

  and Write the following code in config/development.rb

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

  

4. add the following field in the view

<p>

   <%= f.file_field :vid %>

 </p>

4. Write code in model file

class Post < ActiveRecord::Base

   attr_accessible :content, :user_id, :vid

   has_attached_file :vid, :styles => {

   :medium => { :geometry => "640x480", :format => 'flv' },

   :thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10 }

 }, :processors => [:ffmpeg]

validate :get_video_duration

 def get_video_duration

   vid = self.vid_meta[:length].split(/[:.]/)

   count = vid[0].to_i*3600+vid[1].to_i*60+vid[2].to_i

   if count > 8

     errors.add(:duration, "Length Is Greater For Video")

   end

 end

end

get_duration_videos code for not to upload more than 8 sec video.

5. Add the following columns in present table using given migration

class AddVidToPosts < ActiveRecord::Migration

 def change

   add_column :posts, :vid, :string

add_column :posts, :vid_file_name, :string

add_column :posts, :vid_meta, :text

add_column :posts, :vid_file_size, :string

  end

end

6. In the show form Write the following code

<p>

 <b>Content:</b>

  <%= video_tag @post.vid %>

</p>

<p>

  <%=image_tag @post.vid(:thumb).to_s %>

</p>

<a href="<%=@post.vid%>" > Download video </a>