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• How to render animation using Javascript ?

  30 novembre 2018, par user9964622

  I have created animation using tweenjs and createjs libraries createjs and tweenjs, createjs now, I’d like to convert these animations to video files (MPEG4, or other, doesn’t matter) or how can I render it in the backend using nodejs ?

  Here is the solution I have tried so far using ffmpeg server

  test4.js

  (function () {
  
      "use strict";
  
  
  
      var framesPerSecond = 60;
  
      var numFrames = 20; //framesPerSecond * 60 * 2;
  
      var thickness = 100;
  
      var speed = 4;
  
      var frameNum = 0;
  
  
  
      var canvas = document.getElementById("c");
  
      var ctx = canvas.getContext("2d");
  
      canvas.width = 500;
  
      canvas.height = 500;
  
  
  
      var progressElem = document.getElementById("progress");
  
      var progressNode = document.createTextNode("");
  
      progressElem.appendChild(progressNode);
  
  
  
      function onProgress(progress) {
  
        progressNode.nodeValue = (progress * 100).toFixed(1) + "%";
  
      }
  
  
  
      function showVideoLink(url, size) {
  
        size = size ? (" [size: " + (size / 1024 / 1024).toFixed(1) + "meg]") : " [unknown size]";
  
        var a = document.createElement("a");
  
        a.href = url;
  
        var filename = url;
  
        var slashNdx = filename.lastIndexOf("/");
  
        if (slashNdx >= 0) {
  
          filename = filename.substr(slashNdx + 1);
  
        }
  
        a.download = filename;
  
        a.appendChild(document.createTextNode(url + size));
  
        document.body.appendChild(a);
  
      }
  
  
  
      var capturer = new CCapture( {
  
        format: 'ffmpegserver',
  
        //workersPath: "3rdparty/",
  
        //format: 'gif',
  
        verbose: false,
  
        framerate: framesPerSecond,
  
        onProgress: onProgress,
  
        //extension: ".mp4",
  
        //codec: "libx264",
  
      } );
  
      capturer.start();
  
  
  
      function render() {
  
  
  
        var stage = new createjs.Stage("c");
  
        var circle = new createjs.Shape();
  
        circle.graphics.beginFill("Crimson").drawCircle(0, 0, 50);
  
        circle.x = 100;
  
        circle.y = 100;
  
        stage.addChild(circle);
  
        createjs.Tween.get(circle, {loop: true})
  
          .to({x: 400}, 1000, createjs.Ease.getPowInOut(4))
  
          .to({alpha: 0, y: 75}, 500, createjs.Ease.getPowInOut(2))
  
          .to({alpha: 0, y: 125}, 100)
  
          .to({alpha: 1, y: 100}, 500, createjs.Ease.getPowInOut(2))
  
          .to({x: 100}, 800, createjs.Ease.getPowInOut(2));
  
        createjs.Ticker.setFPS(60);
  
        createjs.Ticker.addEventListener("tick", stage);
  
        capturer.capture(canvas);
  
  
  
        ++frameNum;
  
        if (frameNum === numFrames) {
  
          capturer.stop();
  
          capturer.save(showVideoLink);
  
        } else {
  
          requestAnimationFrame(render);
  
        }
  
      }
  
      requestAnimationFrame(render);
  
    }());

  here is html test4.html

    
  
      
  
    
  
    
  
      <canvas></canvas>
  
      <div>-</div>
  
    
  
    <code class="echappe-js">&lt;script src=&quot;http://localhost:8081/ffmpegserver/CCapture.js&quot;&gt;&lt;/script&gt;
    
  &lt;script src=&quot;http://localhost:8081/ffmpegserver/ffmpegserver.js&quot;&gt;&lt;/script&gt;
  
    &lt;script src=&quot;https://code.createjs.com/1.0.0/createjs.min.js&quot;&gt;&lt;/script&gt;
  
    &lt;script src='http://stackoverflow.com/feeds/tag/test4.js'&gt;&lt;/script&gt;
  
  

  when I run my app, it renders very quickly and when I download the converted mp4 file it contains zero MB.

  for reference, u can test by just cloning this repo ffmpeg server repository and add the above files to the public folder

  What am I doing wrong in my code ???

• How to render animation using capturejs ?

  30 novembre 2018, par user9964622

  I have created animation using tweenjs and createjs libraries createjs and tweenjs,createjs now, I’d like to convert these animations to video files (MPEG4, or other, doesn’t matter) or how can I render it in the backend using nodejs ?

  Here is the solution I have tried so far using [ffmpeg server][2]

  test4.js

  (function () {
  
      "use strict";
  
  
  
      var framesPerSecond = 60;
  
      var numFrames = 20; //framesPerSecond * 60 * 2;
  
      var thickness = 100;
  
      var speed = 4;
  
      var frameNum = 0;
  
  
  
      var canvas = document.getElementById("c");
  
      var ctx = canvas.getContext("2d");
  
      canvas.width = 500;
  
      canvas.height = 500;
  
  
  
      var progressElem = document.getElementById("progress");
  
      var progressNode = document.createTextNode("");
  
      progressElem.appendChild(progressNode);
  
  
  
      function onProgress(progress) {
  
        progressNode.nodeValue = (progress * 100).toFixed(1) + "%";
  
      }
  
  
  
      function showVideoLink(url, size) {
  
        size = size ? (" [size: " + (size / 1024 / 1024).toFixed(1) + "meg]") : " [unknown size]";
  
        var a = document.createElement("a");
  
        a.href = url;
  
        var filename = url;
  
        var slashNdx = filename.lastIndexOf("/");
  
        if (slashNdx >= 0) {
  
          filename = filename.substr(slashNdx + 1);
  
        }
  
        a.download = filename;
  
        a.appendChild(document.createTextNode(url + size));
  
        document.body.appendChild(a);
  
      }
  
  
  
      var capturer = new CCapture( {
  
        format: 'ffmpegserver',
  
        //workersPath: "3rdparty/",
  
        //format: 'gif',
  
        verbose: false,
  
        framerate: framesPerSecond,
  
        onProgress: onProgress,
  
        //extension: ".mp4",
  
        //codec: "libx264",
  
      } );
  
      capturer.start();
  
  
  
      function render() {
  
  
  
        var stage = new createjs.Stage("c");
  
        var circle = new createjs.Shape();
  
        circle.graphics.beginFill("Crimson").drawCircle(0, 0, 50);
  
        circle.x = 100;
  
        circle.y = 100;
  
        stage.addChild(circle);
  
        createjs.Tween.get(circle, {loop: true})
  
          .to({x: 400}, 1000, createjs.Ease.getPowInOut(4))
  
          .to({alpha: 0, y: 75}, 500, createjs.Ease.getPowInOut(2))
  
          .to({alpha: 0, y: 125}, 100)
  
          .to({alpha: 1, y: 100}, 500, createjs.Ease.getPowInOut(2))
  
          .to({x: 100}, 800, createjs.Ease.getPowInOut(2));
  
        createjs.Ticker.setFPS(60);
  
        createjs.Ticker.addEventListener("tick", stage);
  
        capturer.capture(canvas);
  
  
  
        ++frameNum;
  
        if (frameNum === numFrames) {
  
          capturer.stop();
  
          capturer.save(showVideoLink);
  
        } else {
  
          requestAnimationFrame(render);
  
        }
  
      }
  
      requestAnimationFrame(render);
  
    }());

  here is html test4.html

    
  
      
  
    
  
    
  
      <canvas></canvas>
  
      <div>-</div>
  
    
  
    <code class="echappe-js">&lt;script src=&quot;http://localhost:8081/ffmpegserver/CCapture.js&quot;&gt;&lt;/script&gt;
    
  &lt;script src=&quot;http://localhost:8081/ffmpegserver/ffmpegserver.js&quot;&gt;&lt;/script&gt;
  
    &lt;script src=&quot;https://code.createjs.com/1.0.0/createjs.min.js&quot;&gt;&lt;/script&gt;
  
    &lt;script src='http://stackoverflow.com/feeds/tag/test4.js'&gt;&lt;/script&gt;
    [1] : https://createjs.com/getting-started
  
    [2] : https://github.com/greggman/ffmpegserver.js
  
  
  

  when I run my app, it renders very quickly and when I download the converted mp4 file it contains zero MB.

  for reference, u can test by just cloning this repo ffmpeg server repository and add the above files to the public folder

  What am I doing wrong in my code ???

• Watson NarrowBand Speech to Text not accepting ogg file

  19 janvier 2017, par Bob Dill

  NodeJS app using ffmpeg to create ogg files from mp3 & mp4. If the source file is broadband, Watson Speech to Text accepts the file with no issues. If the source file is narrow band, Watson Speech to Text fails to read the ogg file. I’ve tested the output from ffmpeg and the narrowband ogg file has the same audio content (e.g. I can listen to it and hear the same people) as the mp3 file. Yes, in advance, I am changing the call to Watson to correctly specify the model and content_type. Code follows :

  exports.createTranscript = function(req, res, next)
  
  { var _name = getNameBase(req.body.movie);
  
    var _type = getType(req.body.movie);
  
    var _voice = (_type == "mp4") ? "en-US_BroadbandModel" : "en-US_NarrowbandModel" ;
  
    var _contentType = (_type == "mp4") ? "audio/ogg" : "audio/basic" ;
  
    var _audio = process.cwd()+"/HTML/movies/"+_name+'ogg';
  
    var transcriptFile = process.cwd()+"/HTML/movies/"+_name+'json';
  
  
  
    speech_to_text.createSession({model: _voice}, function(error, session) {
  
      if (error) {console.log('error:', error);}
  
      else
  
        {
  
          var params = { content_type: _contentType, continuous: true,
  
           audio: fs.createReadStream(_audio),
  
            session_id: session.session_id
  
            };
  
            speech_to_text.recognize(params, function(error, transcript) {
  
              if (error) {console.log('error:', error);}
  
              else
  
                { fs.writeFile(transcriptFile, JSON.stringify(transcript), function(err) {if (err) {console.log(err);}});
  
                  res.send(transcript);
  
                }
  
            });
  
        }
  
    });
  
  }

  _type is either mp3 (narrowband from phone recording) or mp4 (broadband)
  model: _voice has been traced to ensure correct setting
  content_type: _contentType has been traced to ensure correct setting

  Any ogg file submitted to Speech to Text with narrowband settings fails with Error: No speech detected for 30s. Tested with both real narrowband files and asking Watson to read a broadband ogg file (created from mp4) as narrowband. Same error message. What am I missing ?