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• Sending Blobs from a Chrome Extension to a Node.js Process without WebSockets [closed]

  29 octobre 2023, par Matrix 404

  Question :
I have a Puppeteer script that runs a Chrome extension, which opens a webpage. The extension records that tab and sends the recorded blobs to the main Node.js process using WebSockets. The main process then streams these blobs to an RTMP server.

  


  I'm looking for an alternative method to send blobs to the main process without using WebSockets. Additionally, I want to know if it's possible to stream these blobs directly from the browser using FFmpeg wasm.

  


  Details :

  


  


  1. My current setup : Puppeteer script -> Chrome extension (recording) -> WebSockets -> Node.js process -> RTMP server.

     


  


  2. I'm exploring options to eliminate the use of WebSockets while maintaining the ability to send recorded blobs from the Chrome extension to the Node.js process efficiently.

     


  


  3. Is it possible to use FFmpeg wasm to stream blobs directly from the browser to an RTMP server ? If so, how can this be achieved ?

     


  


  


  Additional Information :

  


  

  • The technology stack I'm using includes Puppeteer, Chrome extension, Node.js, and FFmpeg.

  


  • Any code snippets, examples, or recommended libraries are greatly appreciated.

  


  


  Constraints :

  


  

  • Compatibility with modern browsers and reasonable performance are essential.

  


  • Ideally, the solution should work in a headless Chrome instance.

  


  


  Thank you for your assistance in finding an efficient solution to this problem !

  


  

  • The technology stack I'm using includes Puppeteer, Chrome extension, Node.js, and FFmpeg.

  


  • Any code snippets, examples, or recommended libraries are greatly appreciated.

  


  


• 400 Bad Request Error uploading paperclip videos

  5 mars 2017, par jalen201

  Im trying to upload videos with paperclip. When i hit the submit button i receive.

  RSolr::Error::Http - 400 Bad Request Error: 

  this is the migration

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

  Heres the model

  class Pin < ApplicationRecord
  
    acts_as_votable
  
    belongs_to :user
  
    has_many :comments
  
  
  
    searchable do
  
      text :title, :boost => 5
  
      text :description
  
    end
  
  
  
    has_attached_file :image, styles: {medium: "300x300>" }
  
    validates_attachment_content_type :image, content_type: /\Aimage\/.*\z/
  
  
  
    has_attached_file :video, styles: {
  
      :medium => {
  
        :geometry => "640x480",
  
        :format => 'mp4'
  
      },
  
      :thumb => { 
  
        :geometry => "160x120", :format => 'jpeg', :time => 10 
  
      }
  
    },
  
    :processors => [:transcoder]
  
  
  
    validates_attachment_content_type :video, content_type:  /\Avideo\/.*\Z/

  also i added these 4 gems, and installed ffmpeg with homebrew

      gem 'paperclip', '~> 5.1'
  
  
  
      gem 'aws-sdk', '~> 2.8'
  
  
  
      gem 'paperclip-av-transcoder', '~> 0.6.4'
  
  
  
      gem 'paperclip-ffmpeg', '~> 1.2'

  lastly this is my controller, i added :video as a strong parameter.

  class PinsController < ApplicationController
  
  
  
    before_action :find_pin, only: [:show,:edit,:update,:destroy, :upvote]
  
    before_action :authenticate_user!, except: [:index,:show]
  
  
  
    def index
  
      @search = Pin.search do
  
        fulltext params[:search]
  
      end
  
      @pins = @search.results
  
    end
  
  
  
    def new
  
      @pin = current_user.pins.build
  
    end
  
  
  
    def show
  
      @comments = Comment.where(pin_id: @pin).order('created_at DESC')
  
    end
  
  
  
    def edit
  
      @lookup = User.all
  
    end
  
  
  
    def profile
  
      @users = User.all
  
      if User.find_by_username(params[:id])
  
        @username = params[:id]
  
        @user = User.find_by_username(params[:id])
  
      else
  
        redirect_to root_path
  
      end
  
      @user_pin = Pin.all.where('user_id = ?',       User.find_by_username(params[:id]).id)
  
    end
  
  
  
    def update
  
      if @pin.update(pin_params)
  
        redirect_to @pin, notice: "Pin was succesfully updated"
  
      else
  
        render 'edit'
  
      end
  
    end
  
  
  
    def destroy
  
      @pin.destroy
  
      redirect_to root_path       
  
    end
  
  
  
    def upvote
  
      @pin.upvote_by current_user
  
      redirect_to :back
  
    end
  
  
  
    def create
  
      @pin = current_user.pins.build (pin_params)
  
  
  
      if @pin.save
  
        redirect_to @pin , notice: "Succesfully created new pin"
  
      else
  
        render 'new'
  
      end
  
    end
  
  
  
    private
  
  
  
    def pin_params
  
      params.require(:pin).permit(:title, :description, :image, :video)
  
    end
  
  
  
    def find_pin
  
      @pin = Pin.find(params[:id])
  
    end
  
  end

  i added this in the view

  <%= video_tag @pin.video.url(:medium), controls: true, style: "max-width: 100%;" %>

  If anyone could help that would be greatly appreciated

• Build Live Audio Stream Player

  5 décembre 2011, par Kurt

  For an internship project i've been trying to develop a simple audio player for audio live stream.

  Currently i'm using a homemade three buffering (of 1/3 s each) solution played by QAudioOutput, which recall himself after finished his reading.

  void VideoServer::getBuf(QBuffer * p_buf)
  
  {
  
      audio_chunk*    ac = NULL;
  
      std::vector v;
  
  
  
      v.clear();
  
      for (int i = 0; i < 20;)
  
      {
  
          ac = _audioPreviewSharedData->deQueueAudio();
  
          if (ac)
  
          {
  
              v.insert(v.end(), ac->v_buf.begin(), ac->v_buf.end());
  
              i++;
  
              delete ac;
  
          }
  
          else
  
              usleep(50000);
  
      }
  
      p_buf->close();
  
      p_buf->setData((const char *)(&v[0]), v.size()*2);
  
      p_buf->open(QIODevice::ReadOnly);
  
  }

  -

  void VideoServer::slot_launchAudioPreviewBuffering()
  
  {
  
      getBuf(_buf1);
  
      getBuf(_buf2);
  
      _state = 2;
  
      connect(_audioPreviewTimer, SIGNAL(timeout()), this, SLOT(slot_audioPreviewBuffering()));
  
      _audioPreviewTimer->start(0);
  
      connect(_audioOut, SIGNAL(stateChanged(QAudio::State)), this, SLOT(finishedPlaying(QAudio::State)));
  
  }

  -

  void VideoServer::finishedPlaying(QAudio::State state)
  
  {
  
      if(state == QAudio::IdleState) {
  
          slot_audioPreviewBuffering();
  
      }
  
  }

  -

  void VideoServer::slot_audioPreviewBuffering()
  
  {
  
      switch (_state) {
  
      case 0:
  
          {
  
              _audioOut->start(_buf2);
  
              getBuf(_buf1);
  
              _state = 1;
  
              break;
  
          }
  
      case 1:
  
          {
  
              _audioOut->start(_buf3);
  
              getBuf(_buf2);
  
              _state = 2;
  
              break;
  
          }
  
      case 2:
  
          {
  
              _audioOut->start(_buf1);
  
              getBuf(_buf3);
  
              _state = 0;
  
              break;
  
          }
  
      }
  
  }

  But i'm suffering of choppy sound (little interruption between audio chunk).

  How to play this flux without interruption () and with a reasonable delay between audio and video (less 1s) ? Is there a best way ? Am i doing wrong ?

  Thank you !