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• aacenc : Fix target bitrate for twoloop quantiser search

  4 mai 2013, par Claudio Freire

  aacenc : Fix target bitrate for twoloop quantiser search
  This fixes a case where multichannel bitrate isn’t accurately
  
  targetted by psy model alone, never achieving the target bitrate.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavcodec/aaccoder.c

• Carrierwave and FFMPEG saving to 2 destinations - Rails, Fog, S3

  20 avril 2013, par dodgerogers747

  I have a video model, which uses Carrierwave, Fog, FFMPEG and S3 to handle video files. I have a method in my video model that takes a screenshot before the video is saved to S3. Both Video and screenshot are saved to S3 using 2 Carrierwave Uploader classes, Image_uploader and video_uploader with the video being saved to the Video.file column and screenshot saved at the Video.screenshot.

  This all works as intended, however, FFMPEG also saves a copy of the screenshot to the rails filesystem, "Rails.root/file_is_saved_here". For now I have FFMPEG saving this file into the Rails.root/public/uploads folder along with the tmp files created by Carrierwave.

  How can I get one screenshot saved to S3 without the second being saved on the filesystem ?

  Commit & trace data and

  Running transcoding...
  
  /opt/local/bin/ffmpeg -y -i /Users/me/rails_projects/teebox_network/public/uploads/tmp/200/14_jan_2013_hk.mov -ss 3 -vframes 1 -f image2 /Users/garyrogers/rails_projects/teebox_network/public/uploads/14_jan_2013_hk.mov_screenshot.png
  
  
  
  Transcoding of /Users/me/rails_projects/teebox_network/public/uploads/tmp/200/14_jan_2013_hk.mov to /Users/garyrogers/rails_projects/teebox_network/public/uploads/14_jan_2013_hk.mov_screenshot.png succeeded
  
  
  
  Started POST "/videos" for 127.0.0.1 at 2013-04-19 17:03:07 -0700
  
  Processing by VideosController#create as */*
  
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"DjFIu3971GxKYJzjDFu7LaBx85iOHPa5HzO6PLdSW+8=", "video"=>{"user_id"=>"5", "file"=>#quicktime\r\n", @tempfile=#var/folders/1g/d9qbm7_s0_5fcljtvzysp1gc0000gn/T/RackMultipart20130419-751-19kisab>>}}
  
    User Load (0.5ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 5 LIMIT 1
  
     (0.2ms)  BEGIN
  
    SQL (14.9ms)  INSERT INTO `videos` (`created_at`, `file`, `question_id`, `screenshot`, `updated_at`, `user_id`) VALUES ('2013-04-20 00:03:20', '14_jan_2013_hk.mov', NULL, '14_jan_2013_hk.mov_screenshot.png', '2013-04-20 00:03:20', 5)

  video.rb

  class Video < ActiveRecord::Base
  
  
  
    attr_accessible :user_id, :question_id, :file
  
    belongs_to :question
  
    belongs_to :user
  
  
  
    default_scope order('created_at DESC')
  
  
  
    before_save :take_screenshot
  
  
  
    mount_uploader :file, VideoUploader
  
    mount_uploader :screenshot, ImageUploader
  
  
  
    def to_param
  
      "#{id} - #{File.basename(self.file.path)}".parameterize
  
    end
  
  
  
    private 
  
  
  
    def take_screenshot
  
      FFMPEG.ffmpeg_binary = '/opt/local/bin/ffmpeg'
  
      movie = FFMPEG::Movie.new(self.file.current_path)
  
      self.screenshot = movie.screenshot("#{Rails.root}/public/uploads/#{File.basename(self.file.path)}_screenshot.png", seek_time: 3 )
  
    end
  
  end

  image_uploader class

  class ImageUploader < CarrierWave::Uploader::Base
  
  
  
     include Sprockets::Helpers::RailsHelper
  
     include Sprockets::Helpers::IsolatedHelper
  
  
  
    storage :fog
  
  
  
    process resize_and_pad: [270, 135, '#000']
  
  
  
    def store_dir
  
      "uploads/#{model.class.to_s.underscore}_screenshots/#{mounted_as}_images/#{model.id}"
  
    end
  
  
  
    def extension_white_list
  
      %w(png jpg)
  
      # %w(ogg ogv 3gp mp4 m4v webm mov)
  
    end

  Video uploader class

  class VideoUploader < CarrierWave::Uploader::Base
  
  
  
     include Sprockets::Helpers::RailsHelper
  
     include Sprockets::Helpers::IsolatedHelper
  
  
  
    storage :fog
  
  
  
   def store_dir
  
      "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  
    end
  
  
  
    def extension_white_list
  
      %w(ogg ogv 3gp mp4 m4v webm mov m2v 3g2)
  
      # %w(ogg ogv 3gp mp4 m4v webm mov)
  
    end

• Convert video as soon as possible to 854x480p and bitrate 1100kb/s [ffmpeg]

  29 septembre 2016, par Jensej

  Is any fast solution to convert video file to 854x480p and bitrate 1100kb/s using ffmpeg.
  because now it goes with speed of 10 kb / s.

  I using this command :

  ffmpeg -y -threads 8 -i /var/filmy/'.$new_name.' -b 1200k -minrate 1200k -maxrate 1200k -bufsize 1200k -ab 124k -vcodec libx264 -acodec aac -strict -2 -ac 2 -ar 44100 -s 854x480 -y /var/filmy/'.implode('.',array_slice(explode('.',$result['ffilename']), 0, -1)).'.mp4

  CPU : model name : Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz

  RAM : 32 GB

  there is a solution ?