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• Convert compressed swf to mp4

  19 août 2019, par skmvasu

  I’m looking for a batch script to convert swf to mp4, lossless. I tried using both ffmpeg and handbrake, but apparently swf is compressed and I can’t convert them this way.

  ffmpeg -i input -c:v libx264 -preset ultrafast -qp 0 output.mkv
  
  
  
  HandBrakeCLI -i source -o destination

  I know I acn use a tool like xilisoft, but I’ve more than 3000 videos and would need to run this automatically. Is there a script/ algorithm that can help me automate this process ?

• Extract frames from a large video c#

  21 janvier 2014, par las

  I am developing a video editing software.
  For that I need to first load a video for editing.
  After loading the video I need to create a timeline of the video with its Thumbnail images which should take in every one seconds.

  I have tried many options for that but still have an issue with more 10 - 15 mins videos.

  First I used ffmpeg.
  There I tired two options.They ended up with following results
   One is very slow
   Another one is fast but thumbnails are not accurate

  Next I used Aforge.Net
   There I can save images to disk but cannot access after 2000-3000 thumbnails
  (It gives out of memory exception)

  Please if you have good suggestion let me know for this task.
  Any one like to see my tried code samples let me know , I will add it to this question.

  Following is the method for reading images which are in the Disk

    void AddThumbnailImages(int i)
  
    {
  
  
  
       PictureBox pictureBox = new PictureBox();
  
       pictureBox.Size = new System.Drawing.Size(100, 75);
  
  
  
        pictureBox.Image = (Bitmap)new Bitmap("Snaps\\" + i + ".jpeg").Clone();
  
  
  
          if (i == totalFrames)
  
        { pictureBox.Tag = totalTimeForFrames; }
  
        else { pictureBox.Tag = (i / frameRate); }
  
        pictureBox.MouseClick += new MouseEventHandler(ViewImageTag);
  
        pictureBox.MouseDoubleClick += new MouseEventHandler(videoCuting);
  
        pictureBox.MouseHover += new EventHandler(pictureBox_MouseHover);
  
        pictureBox.SizeMode = PictureBoxSizeMode.Zoom;
  
        pictureBox.BringToFront();
  
  
  
       pictureBox.Location = new Point(pictureBoxlocationX + (100 * (i/frameRate)),         pictureBoxlocationY);
  
       panelTimeline.Controls.Add(pictureBox);
  
  
  
     }

• Live streaming using FFMPEG to web audio api

  19 janvier 2014, par Nayan

  I am trying to stream audio using node.js + ffmpeg to browsers connected in LAN only using web audio api.

  Not using element because it's adding it's own buffer of 8 to 10 secs and I want to get maximum high latency possible (around 1 to 2 sec max).

  Audio plays successfully but audio is very choppy and noisy.

  Here is my node.js (server side) file :

  var ws = require('websocket.io'), 
  
  server = ws.listen(3000);
  
  var child_process = require("child_process");
  
  var i = 0;
  
  server.on('connection', function (socket) 
  
  {
  
  
  
  console.log('New client connected');
  
  
  
  var ffmpeg = child_process.spawn("ffmpeg",[
  
      "-re","-i",
  
      "A.mp3","-f",
  
      "f32le",
  
      "pipe:1"                     // Output to STDOUT
  
      ]);
  
  
  
   ffmpeg.stdout.on('data', function(data)
  
   {
  
      var buff = new Buffer(data);
  
      socket.send(buff.toString('base64'));
  
   });
  
  });

  And here is my HTML :

  var audioBuffer = null;
  
  var context = null;
  
  window.addEventListener('load', init, false);
  
  function init() {
  
      try {
  
          context = new webkitAudioContext();
  
      } catch(e) {
  
          alert('Web Audio API is not supported in this browser');
  
      }
  
  }
  
  
  
  var ws = new WebSocket("ws://localhost:3000/");
  
  
  
  ws.onmessage = function(message)
  
  {
  
      var d1 = base64DecToArr(message.data).buffer;
  
      var d2 = new DataView(d1);
  
  
  
      var data = new Float32Array(d2.byteLength / Float32Array.BYTES_PER_ELEMENT);
  
      for (var jj = 0; jj < data.length; ++jj)
  
      {
  
          data[jj] = d2.getFloat32(jj * Float32Array.BYTES_PER_ELEMENT, true);
  
      }
  
  
  
      var audioBuffer = context.createBuffer(2, data.length, 44100);
  
      audioBuffer.getChannelData(0).set(data);
  
  
  
      var source = context.createBufferSource(); // creates a sound source
  
      source.buffer = audioBuffer;
  
      source.connect(context.destination); // connect the source to the context's destination (the speakers)
  
      source.start(0);
  
  };

  Can any one advise what is wrong ?

  Regards,
  Nayan