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• Uploading videos on rails website

  16 mai 2017, par Dinukaperera

  I am trying to let my users upload videos on my website(not deployed yet, testing locally). I have it set up in a manner where if the "user information" gets saved, it will take them to the "root_path", which is the homepage. If the user information is not saved, it will render the form again. Before I added the video upload feature, all the information got saved and everything worked well, but after adding the feature, it keeps rendering the same form over and over again since the information is not getting saved. How do I check what’s wrong ? The command line gives me this error :

  The user information form partial :
  `

  <%= simple_form_for @userinfo do |f| %>
  
    <%= f.input :name, label: 'Full name', error: 'Full name is mandatory' %>
  
    <%= f.input :username, label: 'Username', error: 'Username is mandatory, please specify one' %>
  
    <%= f.input :school, label: 'Name of college' %>
  
    <%= f.input :gpa, label: 'Enter GPA' %>
  
    <%= f.input :email, label: 'Enter email address' %>
  
    <%= f.input :number, label: 'Phone number' %>
  
    <%= f.file_field :video %>
  
    <%= f.button :submit %>
  
  <% end %>

  `

  My user controller (This is the user information controller, does not control user email and password. I’m using the devise gem for user sign in, sign out, and sign up) :`

  class UsersController < ApplicationController
  
      def index
  
      end
  
  
  
      def show
  
      end
  
  
  
      def new
  
          @userinfo = User.new
  
      end
  
  
  
      def create
  
          @userinfo = User.new(user_params)
  
          if @userinfo.save
  
            redirect_to root_path
  
          else
  
            render 'new'
  
          end
  
      end
  
  
  
      def edit
  
      end
  
  
  
      def update
  
      end
  
  
  
      def destroy
  
      end
  
  
  
      private
  
          def user_params
  
              params.require(:user).permit(:name, :username, :email, :number, :school, :gpa, :major, :video)
  
          end
  
  end

  `

  This is the user model (usermain is the model related to user password and email. The user information in the user model belongs to the usermain) : `

  class User < ActiveRecord::Base
  
      belongs_to :usermain
  
  
  
      has_attached_file :video, styles: {:video_show => {:geometry => "640x480",:format => 'mp4'},:video_index => { :geometry => "160x120", :format => 'jpeg', :time => 10}}, :processors => [:transcoder]
  
      validates_attachment_content_type :video, content_type: /\Avideo\/.*\Z/
  
  end

  `

  This is the migration file that creates the user information table :`

  class CreateUsers < ActiveRecord::Migration
  
    def change
  
      create_table :users do |t|
  
        t.string :name
  
        t.string :username
  
        t.string :email
  
        t.string :number
  
        t.string :school
  
        t.string :gpa
  
        t.string :major
  
  
  
        t.timestamps null: false
  
      end
  
    end
  
  end

  This is adding the "video" field to the above created user information table:

  class AddAttachmentVideoToUsers < ActiveRecord::Migration
  
    def self.up
  
      change_table :users do |t|
  
        t.attachment :video
  
      end
  
    end
  
  
  
    def self.down
  
      remove_attachment :users, :video
  
    end
  
  end

  `

  I also have paperclip and ffmpeg installed. When I say installed, it’s literally just that. I’m not sure if I have to manipulate paperclip or ffmpeg in any way to make it work with the videos, I have just installed and did nothing else with them. I have been pulling my hair out for the past two days. Any help is appreciated.

• How to install opencv_contrib on Windows ?

  6 mai 2017, par How to code

  I want to use the function createFisherFaceRecognizer() in python,but when I wrote down model = cv2.createFisherFaceRecognizer() or cv2.face.createFisherFaceRecognizer()
  Error will occurs :

  Traceback (most recent call last) :
  File "C :\Users\Administrator\Desktop\My projects\test\RecognizeMe.py", line 5, in
  model = cv2.face.createFisherFaceRecognizer()
  AttributeError : ’module’ object has no attribute ’face’

  I referenced the methods online and found that I should install opencv_contrib.But I was stucked when I was configureing the opencv using CMake.
  Error :

  CMake Error at cmake/OpenCVUtils.cmake:895 (file) : file DOWNLOAD
  HASH mismatch

  for file: [E:/opencv-3.1.0/sources/opencv-3.1.0/3rdparty/ffmpeg/downloads/35fe6ccdda6d7a04e9056b0d73b98e76/opencv_ffmpeg_64.dll]
  
    expected hash: [35fe6ccdda6d7a04e9056b0d73b98e76]
  
      actual hash: [5171a37169c5e695c556c85dc3103d13]
  
           status: [28;"Timeout was reached"]

  Call Stack (most recent call first) : 3rdparty/ffmpeg/ffmpeg.cmake:15
  (ocv_download) cmake/OpenCVFindLibsVideo.cmake:206 (include)
  CMakeLists.txt:536 (include)

  CMake Error at cmake/OpenCVUtils.cmake:899 (message) : Failed to
  download opencv_ffmpeg_64.dll. Status=28 ;"Timeout was reached" Call
  Stack (most recent call first) : 3rdparty/ffmpeg/ffmpeg.cmake:15
  (ocv_download) cmake/OpenCVFindLibsVideo.cmake:206 (include)
  CMakeLists.txt:536 (include)

  How to solve this problem ?Thank you for your answer !

• Convert a 3d graphic into rgb array

  22 avril 2017, par Praveen C. Naik

  Im working on a project that has 3d led cube (256*256*256).What software do i use to design the 3D model and for projecting the same on the LED cube.The LED used is RGB but the answer need not be for RGB. Even monochromatic LED is also fine.
  Ive tried checking for MATLAB , FFMPG , OPENCV and AUTOCAD.But none of then help.

  Objective : CREATE 3D MODEL => GENERATE MATRIX/ARRAY of colors => Project the matrix onto LED cube.
  The generator has to be dynamic such that any changes in to 3d model should reflect on the LED cube.Any well known simulator as such is encouraged.Please count on the above mentioned software if they can do the same, image processing through matlab/opencv is new for me.

  Input file : graphic 3D model drawn.
  Output file : array of representation of color(any).