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• FFmpeg mp4 encoder for android html

  24 mai 2017, par Dell Watson

  Hello I’m trying to put video .mp4 auto-captured by my webcam using ffmpeg into HTML, and then activated my localhost so my android could see it.

  the video in my android WAS ABLE to play BUT it’s all white and pixels error, so it’s a fail.

  I thought because android has difference surface because in my desktop it runs perfectly, then i keep searching and trying with ogv/webm.

  In the end, I just use a downloaded mp4 and it runs perfectly tho.
  now I think the problem was coming from my mp4-webcam created by ffmpeg(run in cmd)

  I compare a mp4-webcam vs mp4-downloaded

  5sec vs 1min,

  Data-rate : 16477kbps vs 613kbps

  framerate : 30frm/s vs 23frm/s

  size : 9MB vs 5 MB

  even tho it’s only 5sec video by webcam, it still has larger data than a 1min video-downloaded maybe it was because without conversion.

  but the question, is that the reason of the problem ? android-html(google chrome) wasn’t able to display and make a dead pixels since in desktop it runs. it shouldn’t be the problem right ?

  I really need to transfer webcam-record into android-surface (my web-app).

  I have no idea to fix it, any advice ? I’ve been searching a lot. Maybe there was another problem I do not know yet.

  EDIT : my cmd ffmpeg run : ffmpeg -y -f v4l2 -i /dev/video1 -codec:v libx264 -qp 0 -t 0:00:05 hss.mp4

  EDIT 2 : my 2nd thought because ffmpeg encoder that I used(libx264) isnot support for android. but i still no idea

• videotoolbox : add hwcontext support

  15 mai 2017, par wm4

  videotoolbox : add hwcontext support
  This adds tons of code for no other benefit than making VideoToolbox
  
  support conform with the new hwaccel API (using hw_device_ctx and
  
  hw_frames_ctx).
  Since VideoToolbox decoding does not actually require the user to
  
  allocate frames, the new code does mostly nothing.
  One benefit is that ffmpeg_videotoolbox.c can be dropped once generic
  
  hwaccel support for ffmpeg.c is merged from Libav.
  Does not consider VDA or VideoToolbox encoding.
  Fun fact : the frame transfer functions are copied from vaapi, as the
  
  mapping makes copying generic boilerplate. Mapping itself is not
  
  exported by the VT code, because I don't know how to test.
  

  • [DH] doc/APIchanges
  • [DH] libavcodec/vda_vt_internal.h
  • [DH] libavcodec/version.h
  • [DH] libavcodec/videotoolbox.c
  • [DH] libavutil/Makefile
  • [DH] libavutil/hwcontext.c
  • [DH] libavutil/hwcontext.h
  • [DH] libavutil/hwcontext_internal.h
  • [DH] libavutil/hwcontext_videotoolbox.c
  • [DH] libavutil/hwcontext_videotoolbox.h
  • [DH] libavutil/version.h

• 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.