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• How exactly do I extract and merge a audio file using @ffmpeg/ffmpeg

  5 octobre 2022, par jeff.gogooma

  I have a lot of issues about audio transfer to server and frontend.

  


  I am building a solution that is extracting and merging a file received from frontend.

  


  I am using local ffmpeg file with node.js child_process package.

  


  My Env :

  


  framework : nest.js

  


  runtime : node.js

  


  lang : typescript

  


  here is console.log(file : Express.Multer.File).
I am storing to S3 bucket these files. So I am not using multer's memory, disk storage.

  


  // console.log(file);
 {
  fieldname: 'file',
  originalname: 'input1.mp3',
  encoding: '7bit',
  mimetype: 'audio/mpeg'
}


  


  import cp from "child_process";

type Section = { from: number, to: number };

const files: Array = [];

export const setupAudioFileSection = async (file: Express.Multer.File, section: Section) => {
  try {
    const file1 = await cp.exec(`ffmpeg -i ${file} -y -ss 0 -t ${section.from}`);
    const file2 = await cp.exec(`ffmpeg -i ${file} -y -ss ${section.from} -t ${section.to}`);
    const file3 = await cp.exec(`ffmpeg -i ${file} -y -ss ${section.to}`);
    files.push(file1);
    files.push(file3);

    return file2;
  } catch (error) {
    console.log(error);
    throw new Error('setupAudioFileSection error');
  }


  


  But, My Local ffmpeg is printing the error. because of [object Object]. I think local ffmpeg is not recognized the audio file received from client. So, I am resolving this issue by writing a file to disk or memory directly. but I am confusing this solution whether is right or not.

  


  error Error: Command failed: ffmpeg -i [object Object] -y -ss 10 -t 20 -f mp3 ./TestOutput
ffmpeg version 5.1.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.1.1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100

[object: No such file or directory



  


  How can I write file on my server and read ? if that can be, I can resolve [object Object] of ffmpeg issue maybe. Please some answer or advise my issue. Thank you !

  


• When I use Fluent-Ffmpeg to access Ffmpeg, there are two different threads but I dont want it

  25 mars 2019, par Ahmet Hakan Billur

  I try to broadcast with rtsp live stream from IP camera on web app that is improved with node.js-jsmpeg([a link]https://www.npmjs.com/package/fluent-ffmpeg !), web socket, html5(canvas).Everything ok that live streaming works but missing frame and high CPU usaged by streaming on web app and I try to reduce so I can intervene ffmpeg with fluent-ffmpeg but when I monitor CPU usaged I can see there 2 different threads following as and look at screenshot of CPU ;
  

  ffmpeg -rtsp_trasport tcp -i rtsp ://10.6.0.225 -f mpeg1video - is worked by jsmpeg and canvas/html5
  index.html

      
  
  
  
      
  
      
  
      
  
      
  
  
  
      <div><canvas width="640" height="360"></canvas></div>
  
      div><canvas width="640" height="360"></canvas>  
  
      <code class="echappe-js">&lt;script type=&quot;text/javascript&quot; src='http://stackoverflow.com/feeds/tag/jsLib/jsmpeg.js'&gt;&lt;/script&gt;
      
  &lt;script type=&quot;text/javascript&quot; src='http://stackoverflow.com/feeds/tag/jsLib/ffmpegUtil.js'&gt;&lt;/script&gt;
  &lt;script type=&quot;text/javascript&quot;&gt;<br />
  
        var canvas = document.getElementById('videoCanvas');<br />
  
        var ws = new WebSocket(&quot;ws://10.6.0.206:9999&quot;)<br />
  
        var player = new jsmpeg(ws, {canvas:canvas, autoplay:true,audio:false,loop: true});<br />
  
      &lt;/script&gt;
  

  other one /usr/bin/ffmpeg -i rtsp ://10.6.0.225 -y out.ts is work by following piece of code in app.js

  Stream = require('node-rtsp-stream');
  
  stream = new Stream({
  
      name: 'name',
  
      streamUrl: 'rtsp://10.6.0.225',
  
      wsPort: 9999
  
  });
  
  
  
  var ffmpeg = require('fluent-ffmpeg');
  
  var proc = new ffmpeg();
  
  
  
  proc
  
  .addInput('rtsp://10.6.0.225')
  
  .on('start', function(ffmpegCommand) {
  
      /// log something maybe
  
      console.log('start-->'+ffmpegCommand)
  
  })
  
  .on('progress', function(data) {
  
      /// do stuff with progress data if you want
  
      console.log('progress-->'+data)
  
  })
  
  .on('end', function() {
  
      /// encoding is complete, so callback or move on at this point
  
      console.log('end-->')
  
  })
  
  .on('error', function(error) {
  
      /// error handling
  
      console.log('error-->'+error)
  
  
  
  })
  
  .output('out.ts')
  
  .run();

  and then I don’t want to get two different ffmpeg command threads in there.
  Does anyone have an idea ?
  Thanks in advice.

• Data lost in ffmpeg in overlay / steganography using ffmpeg

  3 août 2020, par g Kishore

  Goal : Embedding some textual information into a video(steganography) using LSB encoding. And retrieving the embedded text.

  


  Procedure followed :

  


  

  1. Extracted one frame from video :
ffmpeg -i -vf "select=eq(n,34)" -vframes 1 out.bmp

  


  2. LSB encoding of text into out.bmp using C-code :
NOTE : Decoding of embedded text from out.bmp is working fine[c-code]

  


  3. Insert out.bmp back into original video :
ffmpeg -i -i out.bmp -filter_complex "[0:v][1:v]overlay=enable='between(n,0,0)'[out]" -acodec copy -map
"[out]" -map 0:1 output.mp4

  


  4. Extracted frames from encoded video "output.mp4" :
ffmpeg -i output.mp4 frames%d.bmp
NOTE : Replaced image is present in extracted frames

  


  5. Decoding the text from frames0.bmp, frames1.bmp, frames2.bmp using C-Code
NOTE : not able to decode the text. I tried comparing image data of out.bmp & frames0.bmp, frames1.bmp, frames2.bmp. Lots of changes are there.

  


  


  PS :
. C-code used to encode & decode text into the image is working well. No ambiguity in it.
. Encoded video is playable properly. Only issue is loss of embedded text while overlaying the encoded image back into the video

  


  Any help is appreciated.