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• FFMPEG with node , using child_process , suppressing un-necessary stderr

  16 mai 2018, par drexdelta

  I am trying to resize the video using (FFMPEG + node + child_process). and my code looks something like this , You can read comments and understand it. it’s self-explanatory for people who are familiar with node and ffmpeg. when I run this code, I keep getting error in
  newThread.stderr.on() function . which is not expected behaviour. After running this process I am getting expected video translation, which is expected behaviour.

  const spawn = require('child_process').spawn;
  
  
  
  // resize and compress video promise  = prom2
  
  const resizeVideoWith_FFMPEG_Promise = (sourceFile , sinkFile)=>{
  
      return new Promise ( (resolve , reject)=>{
  
  
  
          // actual command for ffmpeg is something like this , "ffmpeg -i oldVideo -vf scale=-2:480 newVideo"
  
          // New thread
  
          const newThread = spawn('ffmpeg' , ['-i','vid1.mp4','-vf','scale=-2:480','vid2.mp4']);
  
  
  
          // on close signal
  
          newThread.on('close',(data)=>{
  
              console.log(' thread closed for video ' , sourceFile);
  
              return resolve();
  
          });
  
          // on stderr signals
  
          newThread.stderr.on('data',(data)=>{
  
              console.log(' got error in the thread of video ' , sourceFile);
  
              fullError = data.toString();
  
              console.log(fullError);
  
              // return resolve();
  
              // return reject();
  
          });
  
          newThread.stdout.on('data',(data)=>{
  
              // just ignore all stadanrd outputs
  
          });
  
      });
  
  }
  
  
  
  resizeVideoWith_FFMPEG_Promise('vid1.mp4' , 'vid2.mp4' ).then((res)=>{
  
      console.log(res);
  
  });

  For the sake of simplicity I am resolving the promise everytime, even if I get stderr. And at end of running this code I get output something like this ,

   got error in the thread of video  vid1.mp4
  
  frame= 3277 fps=116 q=28.0 size=   12288kB time=00:02:16.64 bitrate= 736.7kbits/s speed=4.82x    
  
   got error in the thread of video  vid1.mp4
  
  frame= 3313 fps=115 q=28.0 size=   12544kB time=00:02:18.15 bitrate= 743.8kbits/s speed=4.79x    
  
   got error in the thread of video  vid1.mp4
  
  frame= 3362 fps=115 q=28.0 size=   12800kB time=00:02:20.17 bitrate= 748.0kbits/s speed=4.78x    
  
   got error in the thread of video  vid1.mp4
  
  frame= 3408 fps=114 q=28.0 size=   12800kB time=00:02:22.12 bitrate= 737.8kbits/s speed=4.77x    
  
   got error in the thread of video  vid1.mp4
  
  frame= 3465 fps=114 q=28.0 size=   13056kB time=00:02:24.49 bitrate= 740.2kbits/s speed=4.76x    
  
   got error in the thread of video  vid1.mp4
  
  frame= 3522 fps=114 q=28.0 size=   13312kB time=00:02:26.86 bitrate= 742.5kbits/s speed=4.76x    
  
   got error in the thread of video  vid1.mp4
  
  frame= 3580 fps=114 q=28.0 size=   13568kB time=00:02:29.28 bitrate= 744.6kbits/s speed=4.76x

  Now, my problem is if I always keep resolving errors, then I will never be able to catch when the video ACTUALLY FAILED TO RESCALE. so, how can I ignore these type of un-necessary stderr and catch only useful errors ?

  Pls someone help.

  I have been through lot of related links like this, but none of these actually solve my problem(even if they did, I couldn’t figure out)

  Error while using h264_cuvid decoder with ffmpeg

  Using module "child_process" without Webpack

  Suppressing STDOUT with node child_process

  Small hint will be very helpful. Thank you .

  BTW , SO moderators , My actual title was like

  stderr problem while using FFMPEG with node via child_process module

  But it didn’t allow me to use such title. so, I am using some dummy title.

• Ffmpeg command in nodejs

  2 mars 2017, par sharad chauhan

  I want to use ffmpeg commands in my nodejs application. I dont want to using any npm packages like fluent-ffmpeg.
  Till now I have done this :

  var ffmpeg = spawn('ffmpeg', ['-i',fileName+'.wav' ,fileName+'.amr','-acodec libopencore_amrnb', '-ab 12200k', '-ac 1', '-ar 8000']);
  
              // input_file.pipe(ffmpeg.stdin);
  
              // ffmpeg.stdout.pipe(output_stream);
  
  
  
              ffmpeg.stderr.on('data', function (data) {
  
                  console.log(data.toString());
  
              });
  
  
  
              ffmpeg.stderr.on('end', function () {
  
                  console.log('file has been converted succesfully');
  
              });
  
  
  
              ffmpeg.stderr.on('exit', function () {
  
                  console.log('child process exited');
  
              });
  
  
  
              ffmpeg.stderr.on('close', function() {
  
                  console.log('...closing time! bye');
  
              });

  In output it gives error like this :

  Unrecognized option 'acodec libopencore_amrnb'

  I have installed all binaries required. Just need to know what command i have to pass in spawn() like :

  var ffmpeg = spawn('ffmpeg', ['-i',fileName+'.wav' ,fileName+'.amr','-acodec libopencore_amrnb', '-ab 12200k', '-ac 1', '-ar 8000']);

  I have tried the command on terminal and works perfectly. All i want is the correct way to pass command (options) in spawn(). Any help would be appreciated.

• Which ffmpeg command sequence can generate the first frame of the video [Need thumbnails for Node.js app]

  6 janvier 2021, par Jedavard

  I'm trying to make thumbnails for videos, but the problem is I'm not able to write some right ffmpeg commands for getting the very first frame. This is for a Node.js AWS Lambda function.

  



  I tried this, but it's not working for me.

  



  -vf "select=eq(n\,0)"


  



  Tried all from here How to extract the 1st frame and restore as an image with ffmpeg ?.

  



  Here's my command line, I copied it and honestly I have no idea about this commands.

  



  function createImage(type) {
    return new Promise((resolve, reject) => {
      let tmpFile = fs.createWriteStream(`/tmp/screenshot.${type}`);
      const ffmpeg = spawn(ffmpegPath, [
      '-ss',
      '00:00:00.01',
      '-i',
      target,
      '-vf',
      `thumbnail`,
      '-qscale:v',
      '2',
      '-frames:v',
      '1',
      '-f',
      'image2',
      '-c:v',
      'mjpeg',
      'pipe:1',
    ]);


  ffmpeg.stdout.pipe(tmpFile);

  ffmpeg.on('close', function(code) {
    tmpFile.end();
    resolve();
  });

  ffmpeg.on('error', function(err) {
    console.log(err);
    reject();
  });
});
}


  



  (I use this https://johnvansickle.com/ffmpeg/ release 4.2.3 version on a Node child process.)