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• Rtsp streaming on nodejs - Blank screen

  17 juillet 2024, par theplaceofburak

  I am currently working on a Node.js project where I need to implement streaming using ffmpeg. However, I am facing an issue with the streaming process, as I am getting an empty blank screen instead of the expected video stream.

  


  Here's a brief overview of what I have done so far on the server-side :

  


  Installed ffmpeg and made sure it is accessible in the environment.
Configured the server-side code for the streaming process.
However, despite these efforts, the stream is not working correctly, and I am unable to see the video stream on the client-side.

  


  Server-side code :
app.js

  


  const express = require('express');
const Stream = require('node-rtsp-stream');

const app = express();
const port = 4000;

// Start the RTSP stream
const stream = new Stream({
  name: 'rtsp_server_name',
  streamUrl: 'rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4',
  wsPort: 3000,
  ffmpegOptions: {
    '-stats': '', // an option with no necessary value uses a blank string
    '-r': 30, // options with required values specify the value after the key
  },
});

stream.on('data', data => {
  console.log(data);
});

app.get('/', (req, res) => {
  res.send('Hello World');
});

app.listen(port, () => {
  console.log(`Server running at http://localhost:${port}/`);
});


  


  index.html

  


  &#xA;  &#xA;    <canvas></canvas>&#xA;  &#xA;  <h1>Test rtsp video</h1>&#xA;  <code class="echappe-js">&lt;script type=&quot;text/javascript&quot; src='http://stackoverflow.com/feeds/tag/js/jsmpeg.min.js'&gt;&lt;/script&gt;&#xA;  &lt;script type=&quot;text/javascript&quot;&gt;&amp;#xA;    player = new JSMpeg.Player(&amp;#x27;ws://localhost:3000&amp;#x27;, {&amp;#xA;      canvas: document.getElementById(&amp;#x27;canvas&amp;#x27;), // Canvas should be a canvas DOM element&amp;#xA;    });&amp;#xA;  &lt;/script&gt;&#xA;&#xA;

  


  I got no console error when I open index.html but only get blank black screen
  


  


• Javascript sync images

  26 septembre 2021, par Ruan Matt

  I'm studying about FPS, animations, image processing in order to get into the game development world.

  


  I took a video and extract each frame into a .jpg image, and I want to run these images, side by side, in the same sync as the original video

  


  You can test at this link => https://jsfiddle.net/ruanmatt144/267erymL/2/

  


  The problem : The video FPS is 30, but even if I put 1000/30, or any other value that refers to the original FPS, it doesn't work ! It doesn't stay in sync. setTimeout has a limit on decimal places that I don't know about ?

  


  Video timestamp for each frame => https://unity-animation.ztech.gq/timestamp.txt

  


  How can I sync those images following the original video timestamp ? Thank you.

  


  var arr = Array();
var v = 0;
var v2 = 0;
var k = 0;

(function getImages(i) {
  setTimeout(function() {
    v++;
    var r = Math.random();
        loadImage("https://unity-animation.ztech.gq/frames/out-" + v + ".jpg?v=" + r);
        arr.push("https://unity-animation.ztech.gq/frames/out-" + v + ".jpg?v=" + r);

        if (--i) getImages(i);
  }, 30)
})(20000);



const loadImage = src =>
    new Promise((resolve, reject) => {
        const img = new Image();
        img.onload = () => resolve(img);
        img.src = src;
    })  
;

var imgArray = new Array();
setTimeout(function() {
    (function runVideo(i) {
        setTimeout(function() {
            v2++;
            imgArray[v2] = new Image();
            document.getElementById('load').appendChild(imgArray[v2]);

            imgArray[v2].src = arr[v2];
            imgArray[v2].classList.add("overlayImage");
            imgArray.shift();
            var parent = document.querySelector("#load");
            [...parent.children].slice(0,-10).forEach(parent.removeChild.bind(parent));
            var last = document.querySelector('#load img:last-child').getAttribute("src");
            var _final = last.substring(
                last.indexOf("-") + 1, 
                last.lastIndexOf(".jpg")
            );
            arr.shift();
        if (--i) runVideo(i);
      }, 90) // <== the problem is here, which value I must use?
    })(38194);
    document.getElementById("video").play();
}, 20000);


  


• CMake on Ubuntu, Requested 'libavdevice' >= 56.4.100 but version of libavdevice is 53.2.0

  5 mars 2019, par user1830386

  I am trying to get into plug in writing for Gazebo but keep running into an error when compiling my programs.

  Requested 'libavdevice >= 56.4.100' but version of libavdevice is 53.2.0
  
  CMake Error at /usr/share/cmake- 
  
  3.10/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  
  Could NOT find AVDEVICE (missing: AVDEVICE_FOUND) (Required is at least
  
  version "56.4.100")

  but when I do ffmpeg -version I get :

   libavdevice    57. 10.100 / 57. 10.100

  Yet CMake seems to think I’m on version 53. Trying to update ffmpeg or libavdevice-dev returns that I am on the latest version.

  Here is my make file :

  cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
  
  
  
  find_package(gazebo REQUIRED)
  
  include_directories(${GAZEBO_INCLUDE_DIRS})
  
  link_directories(${GAZEBO_LIBRARY_DIRS})
  
  list(APPEND CMAKE_CXX_FLAGS "${GAZEBO_CXX_FLAGS}")
  
  
  
  add_library(model_control SHARED model_control.cc)
  
  target_link_libraries(model_control ${GAZEBO_LIBRARIES})
  
  
  
  list(APPEND CMAKE_CXX_FLAGS "${GAZEBO_CXX_FLAGS}")

  and the cc file :

  #include <functional>
  
  #include <gazebo></gazebo>gazebo.hh>
  
  #include <gazebo></gazebo>physics/physics.hh>
  
  #include <gazebo></gazebo>common/common.hh>
  
  #include <ignition></ignition>math/Vector3.hh>
  
  
  
  namespace gazebo
  
  {
  
    class ModelPush : public ModelPlugin
  
    {
  
      public: void Load(physics::ModelPtr _parent, sdf::ElementPtr /*_sdf*/)
  
      {
  
        // Store the pointer to the model
  
        this->model = _parent;
  
  
  
        // Listen to the update event. This event is broadcast every
  
        // simulation iteration.
  
        this->updateConnection = event::Events::ConnectWorldUpdateBegin(
  
            std::bind(&amp;ModelPush::OnUpdate, this));
  
      }
  
  
  
      // Called by the world update start event
  
      public: void OnUpdate()
  
      {
  
        // Apply a small linear velocity to the model.
  
        this->model->SetLinearVel(ignition::math::Vector3d(.3, 0, 0));
  
      }
  
  
  
      // Pointer to the model
  
      private: physics::ModelPtr model;
  
  
  
      // Pointer to the update event connection
  
      private: event::ConnectionPtr updateConnection;
  
    };
  
  
  
    // Register this plugin with the simulator
  
    GZ_REGISTER_MODEL_PLUGIN(ModelPush)
  
  }
  
  </functional>

  Thanks !