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• How to batch synthesize audio with ffmpeg

  8 juillet 2021, par Randy Wilson

  I have 100 audio files and I want to combine them in the order 1-10.11-20.21-30 into a total of 10 audio files, how do I write the command ?
Sorry, I'm a newbie and I'm really not very good at the command line.

  


• ffmpeg to rip mp3 from mp4 in ruby

  11 septembre 2014, par RichardC

  Trying to make basic Ruby script utilising ffmpeg to download a video from Youtube and then rip the mp3 from that video.
  Problem is each time the script fails when trying to separate the two, even though the command themselves run fine outside of the.
  I think the issue is that Ruby is treating the video as a string, but I’m not sure.

  def input
  
      #print "Enter Video URL: "
  
      #@target_video = gets
  
      #@target_video ||= ''
  
      #@target_video.chomp
  
      @target_video = 'https://www.youtube.com/watch?v=bYG1qccSUAw'
  
  end
  
  
  
  def grab
  
      #@video = `viddl-rb #{@target_video}`
  
      `viddl-rb #{@target_video}`
  
  end
  
  
  
  def rip
  
      `ffmpeg -i #{grab} new.mp3`
  
  end
  
  
  
  input
  
  rip

  I tested it in irb and when I tried @video.class it returned string, I think this is where it’s going wrong but I’m not certain.
  The video does download successfully but fails on teh rip.

  Output and error :

  ruby youtube_downloader.rb 
  
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
  
                                   Dload  Upload   Total   Spent    Left  Speed
  
  100 30.4M  100 30.4M    0     0  2580k      0  0:00:12  0:00:12 --:--:-- 2683k
  
  ffmpeg version 2.3.3 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Aug 25 2014 19:47:15 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 48.100 / 55. 48.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 11.100 /  4. 11.100
  
    libavresample   1.  3.  0 /  1.  3.  0
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Loading: No such file or directory
  
  sh: line 1: Plugins: command not found
  
  sh: line 2: Will: command not found
  
  sh: line 3: Analyzing: command not found
  
  sh: line 4: Using: command not found
  
  sh: line 5: [YOUTUBE]: command not found
  
  sh: line 6: [YOUTUBE]: command not found
  
  sh: line 7: Using: command not found
  
  sh: line 8: Download: command not found
  
  sh: line 9: Error:: command not found
  
  sh: line 11: Backtrace:: command not found
  
  sh: -c: line 12: syntax error near unexpected token `:27:in'
  
  sh: -c: line 12: `(eval):27:in `initialize''

• airplay-js no start streaming

  24 août 2015, par Mikel David Carozzi Sanchez

  I’m writing a local file streaming over airplay protocol with subtitle support, to do that I’m using ffmpeg and the process works really fine, but the main problem is when I try to start streaming after burning the subtitle, the airplay doesn’t work, but when I comment the lines that do the burning works fine. What am I doing wrong ? Here is the code.

  var fileSource = './source.mp4';
  
  var subtitleSource = './source.srt';
  
  
  
  var http = require('http'),
  
  fs = require('fs'),
  
  util = require('util'),
  
  OS = require('os'),
  
  spawn = require('child_process').spawn,
  
  airplay = require('airplay-js');
  
  
  
  var browser = airplay.createBrowser();
  
  
  
  var tmpDir = OS.tmpdir();
  
  var tmpFile = tmpDir + '/localTV.mp4';
  
  
  
  var sourceSize;
  
  var tmpFileSize;
  
  
  
  function init(){
  
  console.log('Starting LocalTV');
  
  console.log('Burning Subtitle into ' + fileSource);
  
  
  
  var stat = fs.statSync(fileSource);
  
  sourceSize = stat.size;
  
  
  
  fs.exists(tmpFile, function(exists){
  
      if(exists) fs.unlink(tmpFile)
  
  });
  
  
  
  var ffmpeg = spawn('./ffmpeg', [
  
      '-i', fileSource,
  
      '-sub_charenc', 'CP1252',
  
      '-i', subtitleSource,
  
      '-map', '0:v',
  
      '-map', '0:a',
  
      '-c', 'copy',
  
      '-map', '1',
  
      '-c:s:0', 'mov_text',
  
      '-metadata:s:s:0', 'language=esp',
  
      tmpFile
  
  ]); 
  
  
  
  ffmpeg.stderr.pipe(process.stdout);
  
  
  
  ffmpeg.on('close', function(code){
  
      if(code == 0){
  
          console.log('Burning subtitle finished');
  
          initServer();
  
      }
  
  })
  
  
  
  ffmpeg.on('error', function(error){
  
      console.log(error, 'ffmpeg error');
  
  });
  
  
  
  //  initServer();
  
  
  
  return false;   
  
  }
  
  
  
  function initServer(){
  
  
  
  http.createServer(function (req, res) {
  
  
  
      var path = tmpFile;
  
      var stat = fs.statSync(path);
  
      var total = stat.size;
  
  
  
      if (req.headers['range']) {
  
          var range = req.headers.range;
  
          var parts = range.replace(/bytes=/, "").split("-");
  
          var partialstart = parts[0];
  
          var partialend = parts[1];
  
  
  
          var start = parseInt(partialstart, 10);
  
          var end = partialend ? parseInt(partialend, 10) : total-1;
  
          var chunksize = (end-start)+1;
  
  
  
          var file = fs.createReadStream(path, {start: start, end: end});
  
          res.writeHead(206, { 'Content-Range': 'bytes ' + start + '-' + end + '/' + total, 'Accept-Ranges': 'bytes', 'Content-Length': chunksize, 'Content-Type': 'video/mp4' });
  
          file.pipe(res);
  
  
  
        }else{        
  
  
  
          res.writeHead(200, { 'Content-Length': total, 'Content-Type': 'video/mp4' });
  
          fs.createReadStream(path).pipe(res);
  
      }
  
  
  
  }).listen(1337, '192.168.0.100', function(){
  
      console.log('HTTP Server Started');
  
      startStream();
  
  });
  
  
  
  return false;       
  
  }
  
  
  
  function startStream(){ 
  
  console.log('Streaming to AppleTV');
  
  
  
  var stat = fs.statSync(tmpFile);
  
  tmpFileSize = stat.size;    
  
  
  
  //  if(tmpFileSize >= sourceSize){
  
      browser.on('deviceOn', function(device) {
  
          device.play('http://192.168.0.100:1337', 0, function(status){
  
              console.info(status, 'Playing video');
  
          });
  
      });
  
  
  
      browser.on('error', function(err){
  
          console.log(err, 'Error airplay');
  
      })
  
  
  
      browser.start();
  
  //  }else{
  
  //      console.log('Temp file minor size that source, something is wrong');
  
  //  }
  
  
  
  return false;       
  
  }
  
  
  
  init();