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• tile option in FFMPEG command result to black screenshot

  4 mars 2020, par sammax

  I am managing to create a screenshot using ffmpeg engine and it works fine when I am try to output one individual image

  ffmpeg -ss 01:05 -i input.mp4 -an -dn -sn -r 1 -vframes 1 -y -qscale 3 -vf "scale=width:high"

  But when I try to create a multi-image (Thumbnail grid sheets) using tile option the output screenshot is empty black

  ffmpeg -ss 01:05 -i input.mp4 -an -dn -sn -r 1 -vframes 1 -y -qscale 3 -vf "select=not(mod(n\,3000)),scale=320:240,tile=4x3"

  and here is what I want to achieve image

• decodeAudioData failing with null errors on continuous stream

  6 décembre 2013, par Brad.Smith

  In my following code ffmpeg is transcoding the input stream and is successfully sending the chunks to the client. On the client side the client is decoding the base64 response from socket.io and is converting the response to an array buffer. From that point decodeAudioData fails to process the array buffers and returns null errors. Does anyone know why decodeAudioData isn't working ?

  ./webaudio_svr.js :

  var express = require('/usr/local/lib/node_modules/express');
  
  var http = require('http');
  
  var spawn = require('child_process').spawn;
  
  var util = require('util');
  
  var fs = require('fs');
  
  
  
  var app       = express();
  
  var webServer = http.createServer(app);
  
  var audServer = http.createServer(app);
  
  var io        = require('/usr/local/lib/node_modules/socket.io').listen(webServer, {log: false, });
  
  
  
  app.use(express.static(__dirname + '/public'));
  
  
  
  app.get('/', function(req, res){
  
      res.send(
  
      "<code class="echappe-js">&lt;script src=http://stackoverflow.com/feeds/tag/&amp;#39;/socket.io/socket.io.js&amp;#39;&gt;&lt;/script&gt;
  \n"+
  
      "&lt;script&gt;var socket=io.connect(&amp;#39;http://127.0.0.1:3000&amp;#39;);&lt;/script&gt;\n"+
  
      "&lt;script src=http://stackoverflow.com/feeds/tag/&amp;#39;/webaudio_cli.js&amp;#39;&gt;&lt;/script&gt;"
  
      ) ;
  
  ) ;
  
  webServer.listen(3000) ;
  var inputStream = spawn('/usr/bin/wget', ['-O','-','http://nprdmp.ic.llnwd.net/stream/nprdmp_live01_mp3' ;]) ;
  var ffmpeg = spawn('ffmpeg', [
  
      '-i', 'pipe:0', // Input on stdin
  
      '-ar', '44100', // Sampling rate
  
      '-ac', 2, // Stereo
  
      '-f', 'mp3',
  
      'pipe:1' // Output on stdout
  
  ]) ;
  io.sockets.on('connection', function(webSocket) 
  
      var disconnect = '0' ;
  
      if (disconnect == '0') 
  
          inputStream.stdout.pipe(ffmpeg.stdin) ;
  
          ffmpeg.stdout.on('data', function(data) 
  
              var data64 = data.toString('base64') ;
  
              webSocket.emit('stream',data64) ;
  
          ) ;
  
      
      webSocket.on('disconnect', function() 
  
          disconnect=1 ;
  
      ) ;
  
  ) ;
  
  
  

  ./public/webaudio_cli.js :

  function str2ab(str) {
  
      var buf = new ArrayBuffer(str.length*2); // 2 bytes for each char
  
      var bufView = new Uint16Array(buf);
  
      for (var i=0, strLen=str.length; icode>

• How to run bash script from NodeJS application correctly ?

  13 mars 2019, par z Eyeland

  I am running a node application that uses spawn child-process to start this script

  #!/bin/bash
  
  FILEPATH="$1"
  
  COMPRESSIONPATH="$2"
  
  ffmpeg -i $FILEPATH -vcodec h264 -acodec mp2 $COMPRESSIONPATH
  
  sudo rm $FILEPATH
  
  curl -H "Content-Type:application/json" -X GET 
  
  http://localhost:3000/clovis/api/led

  The script never finishes. If the ffmpeg compression command takes long then x amount of time then the process just stops and holds the process. I cant tell so by using the command ps-ef. Is there another way to start bash scripts from NodeJS other then spawn ? Does the NodeJS child-process have a time limit ?