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• Video out of LinkedList sequence

  14 janvier 2020, par Marks Gniteckis

  I just started working on a side project to learn JavaFX 13 and the idea is to play a sequence of frames like a video without saving the actual video or frames in temp folders. I’d like to buffer images and output them onto ImageView at 30fps. Here is what I’ve got so far :

  The method that buffers images -

  @FXML void takeVideo(ActionEvent event)
  
              throws InterruptedException {
  
          model.purgeBufferedVideo();
  
          Timer timer = new Timer();
  
          long startedAt = System.currentTimeMillis();
  
          TimerTask task = new TimerTask() {
  
              @Override public void run() {
  
                  while (System.currentTimeMillis() < startedAt + (1000 * Long.parseLong(s.getText()))) {
  
                      generateVideo(new Rectangle(Toolkit.getDefaultToolkit()
  
                              .getScreenSize()));
  
                      System.out.println(System.currentTimeMillis() != startedAt + (1000 * Long
  
                              .parseLong(s.getText())));
  
                  }
  
                  cancel();
  
                  System.out.println("Video buffered");
  
              }
  
          };
  
          timer.schedule(task, 0L);
  
      }

  Method to output images onto ImageView -

  @FXML void playVideo(ActionEvent event) {
  
          model.getBufferedVideo().forEach(i -> {
  
  
  
              try {
  
                  preview.setImage(i);
  
                  Thread.sleep((60000 / Long.parseLong(s.getText()))/30);
  
                  preview.setImage(i);
  
              } catch (InterruptedException e) {
  
                  e.printStackTrace();
  
              }
  
          });
  
      }

  List population is working but only last image in the list is displayed in the ImageView and I can’t really get my head around why... Thanks in advance to everyone !

• Paperclip Upload Video Without Styles

  16 mars 2017, par Moamen Naanou

  Background :

  In my app, there is a model has image attachment using paperclip gem, now as per new requirements, I have to let the same attachment accept MP4 video files as well and the only validation I have to implement is about file size.

  Product Model (with image attachment only) :

  class Product < ActiveRecord::Base
  
    has_attached_file :file,
  
                      :styles => { medium: '300x300>', thumb: '100x100>' },
  
                      :processors => [:thumbnail],
  
                      :url => '/assets/:id/:style/:hash.:extension',
  
                      :hash_digest=>'SHA1',
  
                      :use_timestamp => false
  
  
  
  
  
    validates_attachment_content_type :file, :content_type => /\A(image)\/.*\Z/
  
    validates_attachment_size :file, :less_than => 5.megabytes
  
  end

  So after reading many related questions, to accept a video file as well, I’ve used gem paperclip-av-transcoder and installed ffmpeg (Mac) using :

  brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-frei0r --with-libas

  Then finally I’ve revised my model to be :

  class Product < ActiveRecord::Base
  
    has_attached_file :file,
  
                      :styles => lambda {|file| if file.instance.is_image?
  
                                                  { medium: '300x300>', thumb: '100x100>' }
  
                                                elsif file.instance.is_video?
  
                                                  {:thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10}}
  
                                                end },
  
                      :processors => lambda {|file| if file.is_image?
  
                                                      [:thumbnail]
  
                                                    elsif file.is_video?
  
                                                      [:transcoder]
  
                                                    end},
  
                      :url => '/assets/:id/:style/:hash.:extension',
  
                      :hash_digest=>'SHA1',
  
                      :use_timestamp => false
  
  
  
  
  
    validates_attachment_content_type :file, :content_type => /\A(image|video)\/.*\Z/
  
    validates_attachment_size :file, :less_than => 5.megabytes
  
  
  
    def is_video?
  
      file_content_type =~ %r(video)
  
    end
  
  
  
    def is_image?
  
      file_content_type =~ %r(image)
  
    end
  
  end

  Now the file field accepts both videos & images but the video shouldn’t be compressed, because if it is compressed, I will get IO Error [Closed Stream]

  Question :

  I’m expecting compressed MP4 file to be received from Mobile client(through REST API) and I don’t want to generate any thumb image or any other style or do any processing on this video and without installing any processor (ffmpeg in my case) and if I did so currently, I’m getting the following error because ImageMagic doesn’t work with video files :

  Paperclip::Errors::NotIdentifiedByImageMagickError

  Any ideas ?

• Using dragonfly and ffmpeg to process a video in Rails

  26 novembre 2015, par Maikell

  I am writing a Ruby on Rails 4 Web application, that gives the user an image-upload functionality. For this I followed this tutorial, which is using the gems

  dragonfly
  
  jquery-fileupload-rails
  
  remotipart

  This is working fine.
  Now I want to extend the image-upload functionality, to upload videos as well. But unfortunately I’m stuck with it. Here is what I have tried so far :

  config/initializers/dragonfly.rb

  require 'dragonfly'
  
  
  
  # Configure
  
  Dragonfly.app.configure do
  
    plugin :imagemagick
  
  
  
    secret 'd045734b043b4383a246c5c8daf2d3e31217dc8b030f21861e4fd16c4b72d382'
  
  
  
    url_format '/media/:job/:name'
  
  
  
    datastore :file,
  
              root_path: Rails.root.join('uploads/images/'),
  
              server_root: Rails.root.join('uploads')
  
  end
  
  
  
  Dragonfly.app(:videos).configure do
  
    secret 'd045734b043b4383a246c5c8daf2d3e31217dc8b030f21861e4fd16c4b72d382'
  
  
  
    url_format "/media/:job/:name"
  
  
  
    datastore :file,
  
              root_path: Rails.root.join('uploads/videos/'),
  
              server_root: Rails.root.join('uploads')
  
  end
  
  
  
  # Logger
  
  Dragonfly.logger = Rails.logger
  
  
  
  # Mount as middleware
  
  Rails.application.middleware.use Dragonfly::Middleware
  
  
  
  # Add model functionality
  
  if defined?(ActiveRecord::Base)
  
    ActiveRecord::Base.extend Dragonfly::Model
  
    ActiveRecord::Base.extend Dragonfly::Model::Validations
  
  end

  models/video.rb

  class Video < ActiveRecord::Base
  
    dragonfly_accessor :video, app_name: :videos do
  
      storage_options do |video|
  
        { path: "videos/#{Video.gen_uuid}-#{video.name}.webm" }
  
      end
  
    end
  
  end

  I upload the video with ajax. It is succesfully saved in the systems /tmp-directory. Than in the video-controller I call

  @video = Video.new[video_params]
  
  @video.save

  Now the video-params are correctly saved in the database, but the video is not saved in the given directory /uploads/videos Also my goal is, to process the video with ffmpeg, to convert it to a webm. ffmpeg is installed in the system and converting a video on the command line works fine.

  • But how do I get dragonfly to start the conversion process and save the video in the rails project ? Where do I have to put the ffmpeg-commands to dragonfly ?
  • Why does dragonfly not save the video in the directory uploads/videos ?

  Everything works fine with images and imagemagick. Only videos are causing problems.