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• Error : spawn process ffmpeg ChildProcessError

  10 juin 2019, par Karnon

  I wanted to make a program like OBS simply.

  My ideal code behavior is to create a child process in Node.js and execute FFMPEG commands to send a webcam stream to yourtube live RTMP server. However, the actual behavior is caused by an error in the child-process-promise module used in node.js.

  I’ve checked several questions, but I don’t have enough experience to understand them, and I hope there’s a clear solution.

  I guess it was because I couldn’t find the command address of FFMPEG in the Node environment. Or is calling from the socket environment a problem ?

  I checked that the FFMPEG command works in a Windows prompt environment.

  ※ Note : FFMPEG environment variables are registered.

  Environment : Window10, node.js, ffmpeg

  The code took advantage of a simple WebSocket example.

  When I first investigated, I thought that the only way to do this was to use "fluent-effmpeg."

  I tried "fluent-ffmpeg" but I couldn’t get my laptop webcam up and running in Windows environments as a parameter for the "fluent-ffmppeg" command.

  I’ve also thought about using WebRTC, but I think it’s not for personal use because it’s a P2P connection. (I also saw how to connect a peer connection to a WebRTC server like Janus, but I didn’t have enough references to understand it.)

  Below is the code of the problem.

  const SocketIO = require("socket.io");
  
  const ffmpeg = require("fluent-ffmpeg");
  
  const spawn = require("child-process-promise").spawn;
  
  
  
  module.exports = server => {
  
    const io = SocketIO(server, { path: "/socket.io" });
  
  
  
    io.on("connection", socket => {
  
      const req = socket.request;
  
      const ip = req.headers["x-forwarded-for"] || req.connection.remoteAddress;
  
      console.log("새로운 클라이언트 접속!", ip, socket.id, req.ip);
  
      socket.on("disconnect", () => {
  
        console.log("클라이언트 접속해제", ip, socket.id);
  
        clearInterval(socket.interval);
  
      });
  
      socket.on("error", error => {
  
        console.error(error);
  
      });
  
      socket.on("reply", data => {
  
        console.log(data);
  
        ffmpeg_command();
  
      });
  
    });
  
  
  
    function ffmpeg_command() {
  
      let arg = [
  
        "-f",
  
        "lavfi",
  
        "-i",
  
        "anullsrc=r=16000:cl=mono",
  
        "-f",
  
        "dshow",
  
        "-ac",
  
        "2",
  
        "-i",
  
        "video='HP Truevision HD'",
  
        "-s",
  
        "1280x720",
  
        "-r",
  
        "10",
  
        "-vcodec",
  
        "libx264",
  
        "-pix_fmt",
  
        "yuv420p",
  
        "-preset",
  
        "ultrafast",
  
        "-r",
  
        "25",
  
        "-g",
  
        "20",
  
        "-b:v",
  
        "2500k",
  
        "-codec:a",
  
        "libmp3lame",
  
        "-ar",
  
        "44100",
  
        "-threads",
  
        "6",
  
        "-b:a",
  
        "11025",
  
        "-bufsize",
  
        "512k",
  
        "-f",
  
        "flv",
  
        "rtmp://a.rtmp.youtube.com/live2/8dfu-69k0-dxyw-896q"
  
      ];
  
      spawn("ffmpeg", arg).catch(e => {
  
        console.log(e);
  
      });
  
    }
  
  };

  Here’s the error : The expected result is that your webcam is working and YouTube live streaming is successful.

  { ChildProcessError: `ffmpeg -f lavfi -i anullsrc=r=16000:cl=mono -f dshow -ac 2 -i video='HP Truevision HD' -s 1280x720 -r 10 -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -r 25 -g 20 -b:v 2500k -codec:a libmp3lame -ar 44100 -threads 6 -b:a 11025 -bufsize 512k -f flv rtmp://a.rtmp.youtube.com/live2/8dfu-69k0-dxyw-896q` failed with code 1
  
      at ChildProcess.<anonymous> (C:\Users\Tricky\Desktop\Work\ESC\ESC_temp\node_modules\child-process-promise\lib\index.js:132:23)
  
      at ChildProcess.emit (events.js:182:13)
  
      at ChildProcess.cp.emit (C:\Users\Tricky\Desktop\Work\ESC\ESC_temp\node_modules\child-process-promise\node_modules\cross-spawn\lib\enoent.js:40:29)
  
      at maybeClose (internal/child_process.js:962:16)
  
      at Socket.stream.socket.on (internal/child_process.js:381:11)
  
      at Socket.emit (events.js:182:13)
  
      at Pipe._handle.close (net.js:606:12)
  
    name: 'ChildProcessError',
  
    code: 1,
  
    childProcess:
  
     ChildProcess {
  
       _events: { error: [Function], close: [Function] },
  
       _eventsCount: 2,
  
       _maxListeners: undefined,
  
       _closesNeeded: 3,
  
       _closesGot: 3,
  
       connected: false,
  
       signalCode: null,
  
       exitCode: 1,
  
       killed: false,
  
       spawnfile: 'ffmpeg',
  
       _handle: null,
  
       spawnargs:
  
        [ 'ffmpeg',
  
          '-f',
  
          'lavfi',
  
          '-i',
  
          'anullsrc=r=16000:cl=mono',
  
          '-f',
  
          'dshow',
  
          '-ac',
  
          '2',
  
          '-i',
  
          'video=\'HP Truevision HD\'',
  
          '-s',
  
          '1280x720',
  
          '-r',
  
          '10',
  
          '-vcodec',
  
          'libx264',
  
          '-pix_fmt',
  
          'yuv420p',
  
          '-preset',
  
          'ultrafast',
  
          '-r',
  
          '25',
  
          '-g',
  
          '20',
  
          '-b:v',
  
          '2500k',
  
          '-codec:a',
  
          'libmp3lame',
  
          '-ar',
  
          '44100',
  
          '-threads',
  
          '6',
  
          '-b:a',
  
          '11025',
  
          '-bufsize',
  
          '512k',
  
          '-f',
  
          'flv',
  
          'rtmp://a.rtmp.youtube.com/live2/8dfu-69k0-dxyw-896q' ],
  
       pid: 18928,
  
       stdin:
  
        Socket {
  
          connecting: false,
  
          _hadError: false,
  
          _handle: null,
  
          _parent: null,
  
          _host: null,
  
          _readableState: [ReadableState],
  
          readable: false,
  
          _events: [Object],
  
          _eventsCount: 1,
  
          _maxListeners: undefined,
  
          _writableState: [WritableState],
  
          writable: false,
  
          allowHalfOpen: false,
  
          _sockname: null,
  
          _pendingData: null,
  
          _pendingEncoding: '',
  
          server: null,
  
          _server: null,
  
          [Symbol(asyncId)]: 132,
  
          [Symbol(lastWriteQueueSize)]: 0,
  
          [Symbol(timeout)]: null,
  
          [Symbol(kBytesRead)]: 0,
  
          [Symbol(kBytesWritten)]: 0 },
  
       stdout:
  
        Socket {
  
          connecting: false,
  
          _hadError: false,
  
          _handle: null,
  
          _parent: null,
  
          _host: null,
  
          _readableState: [ReadableState],
  
          readable: false,
  
          _events: [Object],
  
          _eventsCount: 2,
  
          _maxListeners: undefined,
  
          _writableState: [WritableState],
  
          writable: false,
  
          allowHalfOpen: false,
  
          _sockname: null,
  
          _pendingData: null,
  
          _pendingEncoding: '',
  
          server: null,
  
          _server: null,
  
          write: [Function: writeAfterFIN],
  
          [Symbol(asyncId)]: 133,
  
          [Symbol(lastWriteQueueSize)]: 0,
  
          [Symbol(timeout)]: null,
  
          [Symbol(kBytesRead)]: 0,
  
          [Symbol(kBytesWritten)]: 0 },
  
       stderr:
  
        Socket {
  
          connecting: false,
  
          _hadError: false,
  
          _handle: null,
  
          _parent: null,
  
          _host: null,
  
          _readableState: [ReadableState],
  
          readable: false,
  
          _events: [Object],
  
          _eventsCount: 2,
  
          _maxListeners: undefined,
  
          _writableState: [WritableState],
  
          writable: false,
  
          allowHalfOpen: false,
  
          _sockname: null,
  
          _pendingData: null,
  
          _pendingEncoding: '',
  
          server: null,
  
          _server: null,
  
          write: [Function: writeAfterFIN],
  
          [Symbol(asyncId)]: 134,
  
          [Symbol(lastWriteQueueSize)]: 0,
  
          [Symbol(timeout)]: null,
  
          [Symbol(kBytesRead)]: 1615,
  
          [Symbol(kBytesWritten)]: 0 },
  
       stdio: [ [Socket], [Socket], [Socket] ],
  
       emit: [Function] },
  
    stdout: undefined,
  
    stderr: undefined }
  
  </anonymous>

• How to programmatically start/stop FFMPEG stream transcoding

  10 décembre 2019, par Paul Wieland

  I have an ip webcam which provides an MJPEG stream. I can successfully transcode and save that stream with ffmpeg under OSX. The following gives me pretty much what I want :

  ffmpeg -f mjpeg -i "http://user:pass@10.0.1.200/nphMotionJpeg?Resolution=640x480&Quality=Standard" -b:v 1500k -vcodec libx264 /tmp/test.mp4

  That will start an FFMPEG session and begin saving the live stream to my test.mp4 file. pressing q will quit ffmpeg and save the file.

  I would like to programmatically start & stop the recording using a PHP or Bash shell script. I have tried the following :

  <?php
  
  
  
  $pid = pcntl_fork();
  
  
  
  if($pid == -1){
  
      die("could not fork"); 
  
  }elseif($pid){
  
      // we are the parent...
  
      print $pid.' started recording. waiting 10 seconds...';
  
      sleep(10); // Wait 10 seconds
  
  
  
      print_r(shell_exec("kill ".$pid)); // Kill the child recording process
  
  
  
      echo 'done';
  
      exit(); 
  
  }else{
  
      // we are the child process. call ffmpeg.
  
      exec('../lib/ffmpeg -f mjpeg -i "http://user:pass@10.0.1.200/nphMotionJpeg?Resolution=640x480&Quality=Standard" -b:v 1500k -vcodec libx264 /tmp/test.mp4');
  
  }

  But there are two problems :

  1. The ffmpeg process does not end/die (probably because its forked again)
  2. When I manually kill the ffmpeg process, the video file is not readable

• Video/Audio transcoding settings ffmpeg

  28 juin 2019, par red

  I’ve configured a Lambda layer with FFMPEG to transcode video and audio, to do the transcoding I do the following :

  • I upload the file with a presigned post to s3
  • s3 have a trigger to automatically call a lambda function on audio/video upload
  • the lambda function spawn a child process for every file
  • the child process transcode the video and save the transcoded file in /tmp
  • then I upload the file renamed back to s3, delete the previous version and the /tmp folder

  Now the audio transcoding is really fast but the video is quite slow, and I know that video transcoding always need more time than audio transcoding, but maybe there is some setting that con help me to speed up a bit, here the settings :

  spawn(ffmpegPath, ['-i', 'https://s3.eu-central-1.amazonaws.com/' + srcBucket + '/' + srcKey, '-codec:v', 'libx264', '-profile:v', 'main', '-preset', 'slow', '-b:v', '400k', '-maxrate', '400k', '-bufsize', '800k', '-vf', `scale=-2:${quality}`, '-threads', '0', '-b:a', '128k', '/tmp/'+dstKey]);

  There is some settings that can help me to speed up transcoding without loose in quality ? or a use different child_process like exec or other maybe can help... This code run in a lambda function with 3008mb of RAM

  Thank you !