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• ffmpeg can't concat movies from two different devices

  29 mars 2017, par T4ng10r

  I’ve got bunch of movies from two different Panasonic devices. As long as I concat movies from only ONE device - final movie is smooth.
  However, when I add movie clip from second device, right after final movie ends playing movies from first device it display audio and only still images from movie clip from other device.
  

  ffmpeg -f concat -i mylist.txt -c copy final_movie.MP4

  Example ffprobe :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'S6810001.MP4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.27.100
  
    Duration: 00:00:10.62, start: 0.021333, bitrate: 1131 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 998 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 132 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandle

  Second device movie clip :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'a/T00004.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.27.100
  
    Duration: 00:00:33.18, start: 0.000000, bitrate: 1190 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 929 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, 256 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Side data:
  
        audio service type: main

  Why movie is still ? How to prepare it so it could be joined correctly ?

• upload video on local host

  20 avril 2017, par chan jack

  when i upload video on local host have error #Unable to detect any supported library#

  @internal_information = InternalInformation.new(internal_information_params)

  if @internal_information.update(internal_information_params)

  respond_to do |format|

  this is my code below

  Model

  class InternalInformation < ApplicationRecord
  
    has_attached_file :video , styles: {
  
                                        :medium => { :geometry => "640x480", :format => 'mp4' },
  
                                        :thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10 }
  
                                    }, :processors => [:transcoder]
  
    validates_attachment_content_type :video, content_type: /\Avideo\/.*\Z/
  
  end

  Controller

  def create
  
  @internal_information = InternalInformation.new(internal_information_params)
  
  
  
  respond_to do |format|
  
    if @internal_information.save
  
      format.html { redirect_to @internal_information, notice: 'Internal information was successfully created.' }
  
      format.json { render :show, status: :created, location: @internal_information }
  
    else
  
      format.html { render :new }
  
      format.json { render json: @internal_information.errors, status: :unprocessable_entity }
  
        end
  
      end
  
    end
  
  
  
    # PATCH/PUT /internal_informations/1
  
    # PATCH/PUT /internal_informations/1.json
  
    def update
  
  respond_to do |format|
  
    if @internal_information.update(internal_information_params)
  
      format.html { redirect_to @internal_information, notice: 'Internal information was successfully updated.' }
  
      format.json { render :show, status: :ok, location: @internal_information }
  
    else
  
      format.html { render :edit }
  
      format.json { render json: @internal_information.errors, status: :unprocessable_entity }
  
        end
  
      end
  
    end

  Show

  <%= javascript_include_tag 'swfobject' %>
  
  <p>&lt;%= notice %></p>
  
  
  
  <p>
  
    <strong>Title:</strong>
  
    &lt;%= @internal_information.Title %>
  
  </p>
  
  
  
  <p>
  
    &lt;%= video_player({:file => @internal_information.video.url(:medium), :image => @internal_information.video.url(:thumb)}) %>
  
  </p>
  
  
  
  &lt;%= link_to 'Edit', edit_internal_information_path(@internal_information) %> |
  
  &lt;%= link_to 'Back', internal_informations_path %>

• 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).