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• Revision c8ed36432e : Non-uniform quantization experiment This framework allows lower quantization bi

  4 mars 2015, par Deb Mukherjee

  Changed Paths :
   Modify /configure

  
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/common/vp9_onyxc_int.h

  
   Modify /vp9/common/vp9_quant_common.c

  
   Modify /vp9/common/vp9_quant_common.h

  
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/decoder/vp9_decodeframe.c

  
   Modify /vp9/decoder/vp9_detokenize.c

  
   Modify /vp9/encoder/vp9_block.h

  
   Modify /vp9/encoder/vp9_encodemb.c

  
   Modify /vp9/encoder/vp9_encodemb.h

  
   Modify /vp9/encoder/vp9_quantize.c

  
   Modify /vp9/encoder/vp9_quantize.h

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Non-uniform quantization experiment

  This framework allows lower quantization bins to be shrunk down or
  expanded to match closer the source distribution (assuming a generalized
  gaussian-like central peaky model for the coefficients) in an
  entropy-constrained sense. Specifically, the width of the bins 0-4 are
  modified as a factor of the nominal quantization step size and from 5
  onwards all bins become the same as the nominal quantization step size.
  Further, different bin width profiles as well as reconstruction values
  can be used based on the coefficient band as well as the quantization step
  size divided into 5 ranges.

  A small gain currently on derflr of about 0.16% is observed with the
  same paraemters for all q values.
  Optimizing the parameters based on qstep value is left as a TODO for now.

  Results on derflr with all expts on is +6.08% (up from 5.88%).

  Experiments are in progress to tune the parameters for different
  coefficient bands and quantization step ranges.

  Change-Id : I88429d8cb0777021bfbb689ef69b764eafb3a1de

• ruby on rails carrierwave-video ffmpeg AWS

  11 mars 2015, par Joseph Han Nim Jang

  I am trying to create an academic site where users can upload lecture videos and other users can view them - similar to a site like Udemy.

  I am using Carrierwave, Carrierwave-video (for encoding videos), AWS to make this happen. AWS configuration has been done, and it’s working.

  However, I am getting this error. (By the way, I am testing this video feature in a Yelpdemo site, so I am trying to have users upload videos to restaurants for now.)

  rails points the error to @restaurant = Restaurant.new(restaurant_params)

  Errno::ENOENT in RestaurantsController#create

  No such file or directory - ffmpeg

  # POST /restaurants.json
  def create
  @restaurant = Restaurant.new(restaurant_params)

  respond_to do |format|
  
    if @restaurant.save

  This is my video_uploader.rb

  # encoding: utf-8
  
  
  
  class VideoUploader < CarrierWave::Uploader::Base
  
  
  
    include CarrierWave::Video
  
    include CarrierWave::Video::Thumbnailer
  
  
  
    process encode_video: [:mp4]
  
  
  
    include CarrierWave::MiniMagick
  
  
  
    storage :fog
  
  
  
    def store_dir
  
      "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  
    end
  
  
  
     version :thumb do
  
        process thumbnail: [{format: 'png', quality: 10, size: 192, strip: true, logger: Rails.logger}]
  
        def full_filename for_file
  
          png_name for_file, version_name
  
        end
  
    end
  
  
  
      def png_name for_file, version_name
  
        %Q{#{version_name}_#{for_file.chomp(File.extname(for_file))}.png}
  
      end
  
  end

  I have manually (added a file to the model) created video.rb in the model - not sure if this is the right way to do it..

  class Video < ActiveRecord::Base
  
  
  
    attr_accessor :user_id, :video,, :type, :filename, :path, :filesize, :width, :height, :duration, :bit_rate
  
  
  
    belongs_to :restaurant
  
    belongs_to :user
  
  
  
    mount_uploader :video, VideoUploader
  
  end

  in app/views/restaurants/show.html.erb for showing the video. Right now, without the encoding done, I can see like an image of the video. When I right lick and copy the code - it gives me the AWS URL which means AWS configuration is in place

          <p>
  
              <strong>Video:</strong>
  
              &lt;%= video_tag @restaurant.video_url %>
  
          </p>

  I am trying to show videos like this.

  I have downloaded FFMPEG (both ffmpeg-2.6 and SnowLeopard_Lion_Mountain_Yosemite_17) - not sure which one’s the right one.. And I have read somewhere that you need to place FFMPEG in your usr/local/bin -> So do you have to physically place ffmpeg exec file in your respective folder ?

  Need your expert help please.

  Thank you in advance !

• Error with IO.popen and ffmepg

  6 mars 2015, par Florian Dano Clement

  I received files in mp3 (2 minutes/files) I want to concatenate together and create a bigger file. So I created my model a function to do this using ffmpeg and IO.popen

  FileUtils.mkdir_p "#{Rails.root}/tmp/files"
  
  imported_dir = "#{Rails.root}/tmp/files/#{SecureRandom.uuid}"
  
  links.each_with_index do |link, index|
  
    file_path = "#{imported_dir}_#{index}#{File.extname(link)}"
  
    File.open(file_path, 'wb') do |file|
  
      file.write open(link).read
  
    end
  
    concat_list << "file '#{file_path}'\n"
  
  end
  
  File.open("#{imported_dir}.txt", 'w'){ |f| f.write(concat_list)}
  
  io = IO.popen("#{Rails.root}/lib/ffmpeg/ffmpeg -f concat -i #{imported_dir}.txt -c copy #{imported_dir}.mp3").readlines
  
  if sound = Sound.create(user_id: user.id, file: File.open("#{imported_dir}.mp3"), lang: lang, title: title)
  
    audio = FFMPEG::Movie.new("#{imported_dir}.mp3")
  
    if !audio.valid?
  
      puts "//_!_\\\\ Failed reading with ffmpeg (#{sound.id})#{sound.title} //_!_\\\\"
  
      return false
  
    end
  
  end 

  the problem is that my .txt file containing the file path

  file '/home/test/apps/example/releases/20150305224026/tmp/files/4dbe9707-cfef-467b-ab2c-a5e1e1165953_0.mp3'

  created files as well but the final file is not created and i got the error message :

  No such file or directory @ rb_sysopen - /home/test/apps/example/releases/20150305224026/tmp/files/4dbe9707-cfef-467b-ab2c-a5e1e1165953.mp3

  If anyone could help me