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• Does paperclip need FFMPEG to upload videos ?

  10 septembre 2016, par Raidspec

  I’m using this gem right now :

  Do i need to install FFMPEG like i did for uploading images (imagemagick) ?

  If I do, i can’t seem to figure out how to install FFMPEG since I’m using Nitrous.io, which is a cloud based IDE.

  I found out how to install Image magick from a line of code on nitrous.io, but i see nothing for FFMPEG.

  So far I have tried googling quite a lot for an alternative encoder that’s compatible with nitrous.

• Unable to upload/convert videos using Paperclip-FFMPEG gem

  30 juillet 2012, par Graeme

  I'm still a bit of a Ruby on Rails newbie (running Rails 3.2.6 and Ruby 1.9.3p194), but I'm finding it very difficult to convert video files using the paperclip-ffmpeg gem. No matter what I do, an error message is displayed on the page after attempting to upload the video :

  "cannot load such file : /[...My info...]/lib/paperclip_processors/ffmpeg.rb"

  I'm trying to test using .mov files for the moment.

  I'm trying to follow the instructions on the gem's github page, but without much success.

  Firstly, I'm using a Mac (Snow Leopard) and ffmpeg is installed (running which ffmpeg tells me it's in /user/local/bin/ffmpeg)

  In my application, I've added the following lines to the gemfile :

  gem 'paperclip'
  
  gem 'paperclip-ffmpeg' 

  I've also added Paperclip.options[:command_path] = "/usr/local/bin/" to config/environments/development.rb as per the instructions :

  Myapp::Application.configure do
  
  
  
  ...
  
  
  
  Paperclip.options[:command_path] = "/usr/local/bin/"
  
  end

  (The instructions also suggest "in your environment config file, let Paperclip know to look there by adding that directory to its path", but I don't know what this means - maybe this is the problem ?).

  My class is structured as follows :

  class Myvideo > ActiveRecord::Base
  
  
  
    attr_accessible :description, :title, :video
  
  
  
    has_attached_file :video, :styles => { 
  
        :medium => { :geometry => "640x480", :format => 'flv' }
  
      }, :processors => [:ffmpeg]
  
  
  
  
  
  end

  My understanding is that the above code converts the uploaded movie from .mov (or whatever) to .flv format.

  However, the error I describe above appears whenever the user clicks on the Upload button (save for a few seconds while the video appears to be uploading).

  Note that I can upload a video via the standard Paperclip gem without converting with no problems. Therefore, this code works (i.e. the video is uploaded but no conversion occurs) :

  attr_accessible :description, :title, :video
  
  
  
    has_attached_file :video

  Any ideas where I might be going wrong ? Thanks !

• preserve alpha channel when changing resolution in webm vp9 ffmpeg

  28 juin 2022, par Patrick Vellia

  I am running the streamio-ffmpeg gem in my Ruby code here to operate the FFMPEG command.

  


  Setting a Webm with codec VP9 that has alpha transparent frames in it as the input, I want to change the resolution from 1080p to 720p and preserve the alpha transparent frames when outputting to the same format/codec.

  


  I've tried it several different ways, but every time it outputs with a black background where the alpha transparent background should be, but ffprobe shows that ALPHA_MODE is set to 1.

  


  Here's the command that streamio-ffmpeg tells the system :

  


  ["/usr/local/bin/ffmpeg", "-y", "-i", "part1.webm", "-s", "1920x1080", "-aspect", "1.7777777777777777", "videos/movie_transparent_1920x1080.webm"]


  


  This one should have been exactly the same as the original, since the original resolution WAS 1080p. The resulting file is actually black background instead of transparent.

  


  Here's my Ruby code :

  


  def process_alpha_transparency(output)
    render_res = []
    case @height
    when 1080..2160
        render_res.append("1920x1080", "1280x720", "852x480")
    when 720..1079
        render_res.append("1280x720", "852x480")
    when 480..719
        render_res.append("852x480")
    when 0..479
        render_res.append(@resolution)
    end

    formats = ["webm", "mov"]
    combined_time_start = Time.now

    render_res.each do |res|
        formats.each do |format|
            puts "Rendering a #{res} resolution version."
            if format == "webm"
                options = {
                    resolution: res 
                }

                time_start = Time.now
                @movie.transcode("videos/#{output}_transparent_#{res}.#{format}", options)
                time_elapsed = Time.now - time_start

                puts "Te resolution rendering completed in #{time_elapsed.to_i.to_s} seconds."
            end
        end
    end

    combined_elapsed_time = Time.now - combined_time_start
    puts "The process completed in #{combined_elapsed_time.to_i.to_s} seconds."

    
end