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• FFmpeg and Ruby linkage

  9 août 2012, par Thomas Kobber Panum

  I'm getting this error :

  Failed encoding. Errors: no output file created. Full output: dyld: Library not loaded: /usr/local/lib/libogg.0.dylib
  
   Referenced from: /usr/local/bin/ffmpeg
  
   Reason: Incompatible library version: ffmpeg requires version 9.0.0 or later, but libogg.0.dylib provides version 6.0.0

  I've installed ffmpeg through brew, and installed both the 'ffmpeg' gem and the 'streamio-ffmpeg' gem.

  Running :

  otool -L /usr/local/lib/libogg.0.dylib

  gives me this output :

  /usr/local/lib/libogg.0.dylib:
  
      /usr/local/lib/libogg.0.dylib (compatibility version 9.0.0, current version 9.0.0)
  
      /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 159.1.0)

  The file I'm using ffmpeg in, looks like this :

  # lib/carrierwave/ffmpeg.rb
  
  require 'streamio-ffmpeg'
  
  module CarrierWave
  
    module FFMPEG
  
      module ClassMethods
  
        def resample( bitrate )
  
          process :resample => bitrate
  
        end
  
      end
  
  
  
      def resample( bitrate )
  
        directory = File.dirname( current_path )
  
        tmpfile   = File.join( directory, "tmpfile" )
  
  
  
        FileUtils.mv( current_path, tmpfile )
  
  
  
        file = ::FFMPEG::Movie.new(tmpfile)
  
        file.transcode( current_path, :audio_bitrate => bitrate)
  
  
  
        File.delete( tmpfile )
  
      end
  
    end
  
  end

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

  31 juillet 2012, par Graeme

  FIXED : It's due to a typo in the relevant lib file that I hadn't spotted ! See this issue for more details.

  ---

  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 !

  ---

  EDIT - the original error message ("Cannot load such file...") appears to have arisen because I hadn't included the relevant ffmpeg.rb file from Github within the /lib directory. Thanks to @wehal3001 for pointing this out !

  However, while I now have this file in my application, I still get the following error when trying to upload a video :

  uninitialized constant Paperclip::Ffmpeg::PaperclipError
  ...
  lib/paperclip_processors/ffmpeg.rb:123:in

  rescue in make'
lib/paperclip_processors/ffmpeg.rb:120:in

  make'
  app/controllers/videos_controller.rb:43:in

  new'
app/controllers/videos_controller.rb:43:in

  create'

  Any help would be much appreciated !

• ffmpeg concat batch loop with text file

  4 octobre 2013, par Lisa Jacobs

  I'm trying to batch a concat loop for a series of avi files where I need to add to each AVI a preroll and postroll movie.

  Here's what I've tried :

  _input.txt file :

  file '3D_preroll.avi'
  
  file '%%a'
  
  file '3D_postroll.avi'

  concat.bat file :

  for %%a in ("*.avi") do ffmpeg -f concat -i _input.txt -c:v libx264 -b:v 1700k -minrate 1500k -maxrate 1900k -bufsize 1900k -deinterlace -acodec libvo_aacenc -ac 2 -ar 48000 -ab 92k "%%a"_432p.mp4
  
  pause

  Unfortunately, I get the following error message before FFMPEG crashes :
  Impossible to open '%%a'

  What am I doing wrong ?

  Thank you :)